How to Make a Waterproof MP3 Player
How to Make a Waterproof MP3 Player -
I always wanted a waterproof music player! So I deside to make myself. With the cheap MP3 player, YP-U3.
SwiMP3 Waterproof MP3 Player
Adding Music to the Water
MP3 players have become extremely popular in the last decade. However, the pleasure of enjoying high quality mp3 files during exercise had been confined only to land sports. Determined to provide workout music for swimmers to enjoy as well, The FINIS Development Team set out to create a personal waterproof mp3 player that transmitted the best sounding music. After nearly 2 years of research and development, the first SwiMP3 prototype was created in 2004. A year later, the revolutionary SwiMP3 was released into the market and was quickly regarded by TIME Magazine as one of the top inventions for 2005.
refurbished mp3 player
refurbished mp3 player
Refurbished MP3 players are the best kept secret since Area 51. Everyone loves ipods and other MP3 players and would love to have at least 2 but some of them are a little pricey. I see people jogging with an MP3 player strapped to their arm. You'll see them everywhere, malls, grocery stores, restaurants, sporting events, etc. People cannot go out without their favorit MP3 player.
If you are wanting one of two but don't want to spend a couple hundred dollars, then here is a secret that most people don't know about. It's called refurbished MP3 players or refurbished Shuffle or refurbished ipods.
I know, now you're wanting to know what a refurbished MP3 player is right? Most people think refurbished MP3 players are defective or broken MP3 players but this is far from the truth. They are not broken or damaged or defective or factory seconds. Refurbished means that the item was returned to the store for some reason. It could have been any reason, like wrong color, scratched, missing parts or manual, got a better price some where else, wrong model, don't like it or don't want it now. There are thousands of reasons why people return items. You just never know and that does not matter. It does not matter if the MP3 player was broken or scratched. And here is why.
Once the MP3 player has been returned to the retail store, it is sent off to a repair station. It is then tested thoroughly. If it fails any test, it is repaired with new parts and tested again. Everything has to pass or it is not sold. Once the MP3 player passes all tests it is returned to the retail store and marked and sold as "refurbished". Returned MP3 players can never be sold as new MP3 players, it is against the law. These repaired or returned MP3 players are sold at a discount because they are refurbished.
Refurbished MP3 players are actually new MP3 players and come with a full factory warranty. They work just like new and look like new too. Just because of the law, they cannot be sold as new. This is great for the consumer because you can save 50% or more on all refurbished MP3 players. I bought a refurbished Shuffle for $30. New Shuffle iPods typically retail for $79.
If you are in the market for a MP3 player than check out refurbished MP3 players. You can save 50% or more. You can get 2 for the rpice of one. Refurb MP3 players are hot.
SanDisk Sansa C250 2GB Multimedia MP3 Player (Refurbished)
Enjoy your music and photos on the go with this MP3 player
Digital multimedia device features a 64k color LCD screen to showcase album art and photos
Audio and video apparatus boasts a sleek black color scheme
SanDisk Sansa Clip 4GB MP3 Player with FM Tuner (Refurbished)
FM Tuner, Voice Recorder - 4GB Flash Memory - Silver
Sony NW-E305 512MB White Walkman MP3 Player (Refurbished)
Sony MP3 player has a 512MB built-in memory
MP3 player features a built-in FM tuner
1-line organic electroluminescence display
Super quick battery charge
Up to 50 Hours of playback life with rechargeable embedded battery
Sony NW-E005 2GB MP3 Player and FM Tuner (Refurbished)
2GB hard drive stores up to 1350 songs in MP3/ ATRAC3/ WMA or AAC formats
Built-in FM tuner for when you want to listen to the new stuff not yet in your collection
A quick 3-minute charge will provide up to 3 hours of play time
Sony NWZ-A728 8GB Black Video MP3 Player (Refurbished)
Store up to 1,850 songs or up to 30 hours of video on your Walkman video/mp3 player
Mp3 player boasts an 8 GB memory
Electronic device features a 2.4-inch QVGA LCD screen
iRiver H10 6GB Lounge Grey MP3 Player/ FM Tuner (Refurbished)
Take your music anywhere with this iRiver H10 MP3 player
Stylish audio device is compact and lightweight
6GB MP3 player also features an FM tuner
Refurbished MP3 players are the best kept secret since Area 51. Everyone loves ipods and other MP3 players and would love to have at least 2 but some of them are a little pricey. I see people jogging with an MP3 player strapped to their arm. You'll see them everywhere, malls, grocery stores, restaurants, sporting events, etc. People cannot go out without their favorit MP3 player.
If you are wanting one of two but don't want to spend a couple hundred dollars, then here is a secret that most people don't know about. It's called refurbished MP3 players or refurbished Shuffle or refurbished ipods.
I know, now you're wanting to know what a refurbished MP3 player is right? Most people think refurbished MP3 players are defective or broken MP3 players but this is far from the truth. They are not broken or damaged or defective or factory seconds. Refurbished means that the item was returned to the store for some reason. It could have been any reason, like wrong color, scratched, missing parts or manual, got a better price some where else, wrong model, don't like it or don't want it now. There are thousands of reasons why people return items. You just never know and that does not matter. It does not matter if the MP3 player was broken or scratched. And here is why.
Once the MP3 player has been returned to the retail store, it is sent off to a repair station. It is then tested thoroughly. If it fails any test, it is repaired with new parts and tested again. Everything has to pass or it is not sold. Once the MP3 player passes all tests it is returned to the retail store and marked and sold as "refurbished". Returned MP3 players can never be sold as new MP3 players, it is against the law. These repaired or returned MP3 players are sold at a discount because they are refurbished.
Refurbished MP3 players are actually new MP3 players and come with a full factory warranty. They work just like new and look like new too. Just because of the law, they cannot be sold as new. This is great for the consumer because you can save 50% or more on all refurbished MP3 players. I bought a refurbished Shuffle for $30. New Shuffle iPods typically retail for $79.
If you are in the market for a MP3 player than check out refurbished MP3 players. You can save 50% or more. You can get 2 for the rpice of one. Refurb MP3 players are hot.
SanDisk Sansa C250 2GB Multimedia MP3 Player (Refurbished)
Enjoy your music and photos on the go with this MP3 player
Digital multimedia device features a 64k color LCD screen to showcase album art and photos
Audio and video apparatus boasts a sleek black color scheme
SanDisk Sansa Clip 4GB MP3 Player with FM Tuner (Refurbished)
FM Tuner, Voice Recorder - 4GB Flash Memory - Silver
Sony NW-E305 512MB White Walkman MP3 Player (Refurbished)
Sony MP3 player has a 512MB built-in memory
MP3 player features a built-in FM tuner
1-line organic electroluminescence display
Super quick battery charge
Up to 50 Hours of playback life with rechargeable embedded battery
Sony NW-E005 2GB MP3 Player and FM Tuner (Refurbished)
2GB hard drive stores up to 1350 songs in MP3/ ATRAC3/ WMA or AAC formats
Built-in FM tuner for when you want to listen to the new stuff not yet in your collection
A quick 3-minute charge will provide up to 3 hours of play time
Sony NWZ-A728 8GB Black Video MP3 Player (Refurbished)
Store up to 1,850 songs or up to 30 hours of video on your Walkman video/mp3 player
Mp3 player boasts an 8 GB memory
Electronic device features a 2.4-inch QVGA LCD screen
iRiver H10 6GB Lounge Grey MP3 Player/ FM Tuner (Refurbished)
Take your music anywhere with this iRiver H10 MP3 player
Stylish audio device is compact and lightweight
6GB MP3 player also features an FM tuner
mobile fm transmitter
mobile fm transmitter
FM Transmitter for Mobile Phones
Express Office Automation Co. has come up with a neat little device that allows you to transmit your mobile phone calls and MP3s stored on your phone through your FM radio.
If you are interested in this device, the company has put up a demostration video on YouTube that will give you a good idea of how this works. It is designed to work with Nokia and Motorola phones.
Belkin TuneCast I Mobile FM Transmitter
Now use your iPod, PDA, MP3, CD, cassette player, PC or laptop to listen to your favorite tunes through any FM stereo receiver. The Belkin TuneCast Mobile FM Transmitter wirelessly connects portable music players to your car or home stereo quickly and easily.
Simple to use: Plug the FM transmitter into the headphone jack of your iPod, PDA, MP3, CD or cassette player; or connect it to your PC or laptop computer
Then tune your car stereo or home stereo receiver to the clearest FM frequency, and enjoy your digital music with great sound and convenience
Works best when you are within 10 feet of the FM transmitter, but you can still get good results up to 30 feet away
Also offers a fast and convenient way to enhance your home audio experience. Simply connect the FM transmitter to the 3.5 mm audio-out port on your digital camera or video game console, and enjoy surround sound through your home stereo system.
2 AAA batteries included
Nokia FM Transmitter CA-300
Nokia FM Transmitter CA-300 – Your MP3s on radio
Play your favourite tunes over your car's FM radio with the Nokia FM Transmitter CA-300. Just connect your compatible mobile device to the transmitter through the 3.5mm AV cable, plug it into the car's cigarette lighter socket for power, and select an unused radio frequency. It also comes with an additional cable for charging your Nokia mobile device on the road.
FM Transmitter for Mobile Phones
Express Office Automation Co. has come up with a neat little device that allows you to transmit your mobile phone calls and MP3s stored on your phone through your FM radio.
If you are interested in this device, the company has put up a demostration video on YouTube that will give you a good idea of how this works. It is designed to work with Nokia and Motorola phones.
Belkin TuneCast I Mobile FM Transmitter
Now use your iPod, PDA, MP3, CD, cassette player, PC or laptop to listen to your favorite tunes through any FM stereo receiver. The Belkin TuneCast Mobile FM Transmitter wirelessly connects portable music players to your car or home stereo quickly and easily.
Simple to use: Plug the FM transmitter into the headphone jack of your iPod, PDA, MP3, CD or cassette player; or connect it to your PC or laptop computer
Then tune your car stereo or home stereo receiver to the clearest FM frequency, and enjoy your digital music with great sound and convenience
Works best when you are within 10 feet of the FM transmitter, but you can still get good results up to 30 feet away
Also offers a fast and convenient way to enhance your home audio experience. Simply connect the FM transmitter to the 3.5 mm audio-out port on your digital camera or video game console, and enjoy surround sound through your home stereo system.
2 AAA batteries included
Nokia FM Transmitter CA-300
Nokia FM Transmitter CA-300 – Your MP3s on radio
Play your favourite tunes over your car's FM radio with the Nokia FM Transmitter CA-300. Just connect your compatible mobile device to the transmitter through the 3.5mm AV cable, plug it into the car's cigarette lighter socket for power, and select an unused radio frequency. It also comes with an additional cable for charging your Nokia mobile device on the road.
fm radio transmitter
FM Transmitter
Here is the schematic, PC board pattern, and parts placement for a low powered FM transmitter. The range of the transmitter when running at 9V is about 300 feet. Running it from 12V increases the range to about 400 feet. This transmitter should not be used as a room or telephone bug.
Digital FM Transmitter
The FM Transmitter uses FM radio waves to send sound from any device you choose to any nearby radio or stereo system. The only wire you have to connect is from the FM Transmitter to the headphone jack. Simple as that. And since the Transmitter works with any device that has a headphone jack, you can use it with your computer, WiFi radio, MP3 player, DVD player, and even satellite radio. One of the unsung qualities of C. Crane’s Digital FM Transmitter is its extreme versatility. While most people use it to send music from their computers or MP3 players to a nearby radio, some customers have told us how they use it with their guitars, portable DVD players (a lot of fun in cars), and even other radios. It is perhaps the only FM Transmitter with adjustable audio input so it can handle virtually any level of audio input.
Low Power FM Transmitter
This article should satisfy those who might want to build a low power FM transmitter. It is designed to use an input from another sound source (such as a guitar or microphone), and transmits on the commercial FM band - it is actually quite powerful, so make sure that you don't use it to transmit anything sensitive - it could easily be picked up from several hundred metres away.
FM Transmitter Circuit
An low power FM Transmitter using an op-amp as the audio preamp and a single transistor as the RF amplifier.
K18V2. FM TRANSMITTER
This is an improved kit 18. At first sight it looks similar to the original Kit 18 – especially the inductor
etched onto the PCB – but it has been tinkered with by Harry Lythall in Sweden to give the best distance and stability for its size.
FM Radio Transmitters
The Si471x is the industry's first 100% CMOS, single-chip FM transmitter IC. The Si4712/13 are the industry's first integrated transmitters with Receive Power Scan (RPS).
BA1404 HI-FI Stereo FM Transmitter Kit
Be "On Air" with your own radio station! BA1404 based transmitter is an exciting product that will broadcast high quality stereo signal in 88MHz - 108MHz FM band. It can be connected to any type of stereo audio source such as iPod, Computer, Laptop, CD Player, Walkman, Television, Satellite Receiver, Tape Deck or other stereo system to transmit stereo sound with excellent clarity throughout your home, office, yard or camp ground.
BA1404 - HI-FI Stereo FM Transmitter Project
This high quality stereo FM transmitter prototype is a result of many hours of testing and tweaking. The goal was simple; to test many existing BA1404 transmitter designs, compare their performance, identify weaknesses and come up with a new BA1404 transmitter design that improves sound quality, has very good frequency stability, maximizes transmitter's range, and is fairly simple for everyone to build. We are happy to announce that this goal and expectations have been met and even exceeded.
BH1417 Stereo PLL FM Transmitter
This is the latest BH1417 FM Transmitter design from RHOM that includes a lot of features in one small package. It comes with pre-emphasis, limiter so that the music can be transmitted at the same audio level, stereo encoder for stereo transmission, low pass filter that blocks any audio signals above 15KHz to prevent any RF interference, PLL circuit that provides rock solid frequency transmission which means no more frequency drift, FM oscillator and RF output buffer.
BA1404 Stereo FM Transmitter IC in stock
As of today we are starting the sale of the popular BA1404 IC which has integrated stereo encoder and FM transmitter, all in one package. We also carry 38KHz crystals so if you have been waiting to build your own stereo FM transmitter to transmit your music around the house, grab a schematic from the "Schematics" section and start building one today.
Long-range FM Transmitter
The circuit built around transistor T1 (BF494) is a basic low-power variable-frequency VHF oscillator. A varicap diode circuit is included to change the frequency of the transmitter and to provide frequency modulation by audio signals. The output of the oscillator is about 50 milliwatts. Transistor T2 (2N3866) forms a VHF-class A power amplifier. It boosts the oscillator signals’ power four to five times. Thus, 200-250 milliwatts of power is generated at the collector of transistor T2.
Here is the schematic, PC board pattern, and parts placement for a low powered FM transmitter. The range of the transmitter when running at 9V is about 300 feet. Running it from 12V increases the range to about 400 feet. This transmitter should not be used as a room or telephone bug.
Digital FM Transmitter
The FM Transmitter uses FM radio waves to send sound from any device you choose to any nearby radio or stereo system. The only wire you have to connect is from the FM Transmitter to the headphone jack. Simple as that. And since the Transmitter works with any device that has a headphone jack, you can use it with your computer, WiFi radio, MP3 player, DVD player, and even satellite radio. One of the unsung qualities of C. Crane’s Digital FM Transmitter is its extreme versatility. While most people use it to send music from their computers or MP3 players to a nearby radio, some customers have told us how they use it with their guitars, portable DVD players (a lot of fun in cars), and even other radios. It is perhaps the only FM Transmitter with adjustable audio input so it can handle virtually any level of audio input.
Low Power FM Transmitter
This article should satisfy those who might want to build a low power FM transmitter. It is designed to use an input from another sound source (such as a guitar or microphone), and transmits on the commercial FM band - it is actually quite powerful, so make sure that you don't use it to transmit anything sensitive - it could easily be picked up from several hundred metres away.
FM Transmitter Circuit
An low power FM Transmitter using an op-amp as the audio preamp and a single transistor as the RF amplifier.
K18V2. FM TRANSMITTER
This is an improved kit 18. At first sight it looks similar to the original Kit 18 – especially the inductor
etched onto the PCB – but it has been tinkered with by Harry Lythall in Sweden to give the best distance and stability for its size.
FM Radio Transmitters
The Si471x is the industry's first 100% CMOS, single-chip FM transmitter IC. The Si4712/13 are the industry's first integrated transmitters with Receive Power Scan (RPS).
BA1404 HI-FI Stereo FM Transmitter Kit
Be "On Air" with your own radio station! BA1404 based transmitter is an exciting product that will broadcast high quality stereo signal in 88MHz - 108MHz FM band. It can be connected to any type of stereo audio source such as iPod, Computer, Laptop, CD Player, Walkman, Television, Satellite Receiver, Tape Deck or other stereo system to transmit stereo sound with excellent clarity throughout your home, office, yard or camp ground.
BA1404 - HI-FI Stereo FM Transmitter Project
This high quality stereo FM transmitter prototype is a result of many hours of testing and tweaking. The goal was simple; to test many existing BA1404 transmitter designs, compare their performance, identify weaknesses and come up with a new BA1404 transmitter design that improves sound quality, has very good frequency stability, maximizes transmitter's range, and is fairly simple for everyone to build. We are happy to announce that this goal and expectations have been met and even exceeded.
BH1417 Stereo PLL FM Transmitter
This is the latest BH1417 FM Transmitter design from RHOM that includes a lot of features in one small package. It comes with pre-emphasis, limiter so that the music can be transmitted at the same audio level, stereo encoder for stereo transmission, low pass filter that blocks any audio signals above 15KHz to prevent any RF interference, PLL circuit that provides rock solid frequency transmission which means no more frequency drift, FM oscillator and RF output buffer.
BA1404 Stereo FM Transmitter IC in stock
As of today we are starting the sale of the popular BA1404 IC which has integrated stereo encoder and FM transmitter, all in one package. We also carry 38KHz crystals so if you have been waiting to build your own stereo FM transmitter to transmit your music around the house, grab a schematic from the "Schematics" section and start building one today.
Long-range FM Transmitter
The circuit built around transistor T1 (BF494) is a basic low-power variable-frequency VHF oscillator. A varicap diode circuit is included to change the frequency of the transmitter and to provide frequency modulation by audio signals. The output of the oscillator is about 50 milliwatts. Transistor T2 (2N3866) forms a VHF-class A power amplifier. It boosts the oscillator signals’ power four to five times. Thus, 200-250 milliwatts of power is generated at the collector of transistor T2.
radio schematics
AM Receiver
This is a compact three transistor, regenerative receiver with fixed feedback. It is similar in principle to the ZN414 radio IC which is now replaced by the MK484. The design is simple and sensitivity and selectivity of the receiver are good.
Medium Wave Active Antenna
This circuit is designed to amplify the input from a telescopic whip antenna. The preamplifier is designed to cover the medium waveband from about 550Khz to 1650Khz. The tuning voltage is supplied via RV2, a 10k potentiometer connected to the 12 Volt power supply.
Q- Multiplying Loop Antenna
This circuit is designed to be used in conjunction with the standard 4 foot square loop used in MW for long distance reception.
ZN414 Portable AM Receiver
An AM portable radio receiver made from the ZN414 IC. The ZN414 ic has now been replaced by the MK484 which is identical in performance and pinout.
SW Receiver Using ZN414
A Short Wave Receiver based on the MK484 (formerly ZN414) that includes the tropical bands and 49 metre bands.
MK484 Radio with Loudspeaker
A complete AM radio set based on the MK484 IC (formerly ZN414). It uses a PNP transistor and can drive a 150R loudspeaker.
Radio Receiver Design
This tutorial will teach you in very easy steps how to design basic radio receivers. I will attempt to de-mystify most aspects of design by my usual extremely casual approach to an electronic tutorial. It doesn't matter whether you are a short wave listener, an A.M. radio dx'er, into hobby electronics or amateur radio design, the broad basic principles will still apply.
Build A One Transistor FM Radio
AM radio circuits and kits abound. Some work quite well. But, look around and you will find virtually no FM radio kits. Certainly, there are no simple FM radio kits. The simple FM radio circuit got lost during the transition from vacuum tubes to transistors. In the late 1950s and early 1960s there were several construction articles on building a simple superregenerative FM radio. After exhaustive research into the early articles and some key assistance from a modern day guru in regenerative circuit design, I have developed this simple radio kit. It is a remarkable circuit. It is sensitive, selective, and has enough audio drive for an earphone. Read more about theory behind this radio on the low-tech FM page.
This is a compact three transistor, regenerative receiver with fixed feedback. It is similar in principle to the ZN414 radio IC which is now replaced by the MK484. The design is simple and sensitivity and selectivity of the receiver are good.
Medium Wave Active Antenna
This circuit is designed to amplify the input from a telescopic whip antenna. The preamplifier is designed to cover the medium waveband from about 550Khz to 1650Khz. The tuning voltage is supplied via RV2, a 10k potentiometer connected to the 12 Volt power supply.
Q- Multiplying Loop Antenna
This circuit is designed to be used in conjunction with the standard 4 foot square loop used in MW for long distance reception.
ZN414 Portable AM Receiver
An AM portable radio receiver made from the ZN414 IC. The ZN414 ic has now been replaced by the MK484 which is identical in performance and pinout.
SW Receiver Using ZN414
A Short Wave Receiver based on the MK484 (formerly ZN414) that includes the tropical bands and 49 metre bands.
MK484 Radio with Loudspeaker
A complete AM radio set based on the MK484 IC (formerly ZN414). It uses a PNP transistor and can drive a 150R loudspeaker.
Radio Receiver Design
This tutorial will teach you in very easy steps how to design basic radio receivers. I will attempt to de-mystify most aspects of design by my usual extremely casual approach to an electronic tutorial. It doesn't matter whether you are a short wave listener, an A.M. radio dx'er, into hobby electronics or amateur radio design, the broad basic principles will still apply.
Build A One Transistor FM Radio
AM radio circuits and kits abound. Some work quite well. But, look around and you will find virtually no FM radio kits. Certainly, there are no simple FM radio kits. The simple FM radio circuit got lost during the transition from vacuum tubes to transistors. In the late 1950s and early 1960s there were several construction articles on building a simple superregenerative FM radio. After exhaustive research into the early articles and some key assistance from a modern day guru in regenerative circuit design, I have developed this simple radio kit. It is a remarkable circuit. It is sensitive, selective, and has enough audio drive for an earphone. Read more about theory behind this radio on the low-tech FM page.
motor control circuits
Automatic Speed Controller for fans and Coolers
Soft Button type Motor Direction Controller
Discrete component motor direction controller
Super simple stepper motor controller
AC motor control circuits
Push Button Motor Control Circuits
The circuits on this page are for motor controls using Push buttons and would typically be found in commercial and industrial installations.
Brush-DC Servomotor using PIC17C756A
This application note demonstrates the use of a PIC17C756A microcontroller (MCU) in a brush-DC servomotor application. The PIC17CXXX family of micro-controllers makes an excellent choice for cost-effective embedded servomotor control applications. Some of the benefits of the PIC17CXXX MCU family include fast instruction cycle execution (up to 120 ns), an 8 x 8 hardware multiplier, and many useful hardware peripherals.
Microchip’s Fan Speed Controllers to a SPI
Microchip's TC642, TC643, and TC646 are the world's first integrated circuits dedicated for controlling and monitoring fan speed. The new family of fan speed controllers modulate fan speed to compensate for changes in system temperature. This means the fan runs at full speed only when necessary, significantly extending fan life. In addition to increased fan life, fan speed is controlled by PWM control circuitry that is more efficient than conventional linear techniques. The ICs provide other features such as fan current limiting, minimum speed control, auto shutdown, and speed, fault, and over-temperature indication.
DC Motor Speed Control with CMOS ICs
Two low-cost CMOS ICs manage a 12 VDC, current-limited speed control circuit for DC brush motors. The circuit design (see Figure 1) uses PWM (pulse width modulation) to chop the effective input voltage to the motor. Use of CMOS devices gives the benefits of low power, minimal heat and improved longevity. The overall design is simple, inexpensive and reliable, and is useful in applications such as embedded DC motor control where efficiency, economy and performance are essential.
Control 3-Phase AC Motors Using PIC18F4431
This application note describes how the PIC18F4431 may be used to control an ACIM using open and closed-loop V/f control strategies. The application code is built incrementally and demonstrates the following control methods: 1. Voltage-frequency (V/f) control 2. Voltage-frequency control with current feedback 3. Voltage-frequency control with velocity feedback and PID control The PIC18F4431 incorporates a set of innovative peripherals, designed especially for motor control applications. The utility of these peripherals is demonstrated in both open and closed-loop three-phase ACIM motor applications. It is assumed that the reader is already familiar with the theory and nomenclature of AC induction motors. For an excellent introduction to the basic concepts of induction motors control, please refer to Microchip?s application note AN887, ?AC Induction Motor Fundamentals?
Motor Control Sensor Circuits
Sensors are a critical component in a motor control system. They are used to sense the current, position, speed and direction of the rotating motor. Recent advancements in sensor technology have improved the accuracy and reliability of sensors, while reducing the cost. Many sensors are now available that integrate the sensor and signal-conditioning circuitry into a single package.
AC switching with TRIAC from TTL Schematics wiring diagram circuits
schema electronic projects.
CK1400 - DC Motor Speed Controller schematics free electronic circuits diagram wiring plans schema projects schematico electrónico schématique diagrama esquemático projeto elektronisch schematisch schematy circuito shema σχηματική αναπαράσταση схема skematisk Schaltbild schematisk
Soft Button type Motor Direction Controller
Discrete component motor direction controller
Super simple stepper motor controller
AC motor control circuits
Push Button Motor Control Circuits
The circuits on this page are for motor controls using Push buttons and would typically be found in commercial and industrial installations.
Brush-DC Servomotor using PIC17C756A
This application note demonstrates the use of a PIC17C756A microcontroller (MCU) in a brush-DC servomotor application. The PIC17CXXX family of micro-controllers makes an excellent choice for cost-effective embedded servomotor control applications. Some of the benefits of the PIC17CXXX MCU family include fast instruction cycle execution (up to 120 ns), an 8 x 8 hardware multiplier, and many useful hardware peripherals.
Microchip’s Fan Speed Controllers to a SPI
Microchip's TC642, TC643, and TC646 are the world's first integrated circuits dedicated for controlling and monitoring fan speed. The new family of fan speed controllers modulate fan speed to compensate for changes in system temperature. This means the fan runs at full speed only when necessary, significantly extending fan life. In addition to increased fan life, fan speed is controlled by PWM control circuitry that is more efficient than conventional linear techniques. The ICs provide other features such as fan current limiting, minimum speed control, auto shutdown, and speed, fault, and over-temperature indication.
DC Motor Speed Control with CMOS ICs
Two low-cost CMOS ICs manage a 12 VDC, current-limited speed control circuit for DC brush motors. The circuit design (see Figure 1) uses PWM (pulse width modulation) to chop the effective input voltage to the motor. Use of CMOS devices gives the benefits of low power, minimal heat and improved longevity. The overall design is simple, inexpensive and reliable, and is useful in applications such as embedded DC motor control where efficiency, economy and performance are essential.
Control 3-Phase AC Motors Using PIC18F4431
This application note describes how the PIC18F4431 may be used to control an ACIM using open and closed-loop V/f control strategies. The application code is built incrementally and demonstrates the following control methods: 1. Voltage-frequency (V/f) control 2. Voltage-frequency control with current feedback 3. Voltage-frequency control with velocity feedback and PID control The PIC18F4431 incorporates a set of innovative peripherals, designed especially for motor control applications. The utility of these peripherals is demonstrated in both open and closed-loop three-phase ACIM motor applications. It is assumed that the reader is already familiar with the theory and nomenclature of AC induction motors. For an excellent introduction to the basic concepts of induction motors control, please refer to Microchip?s application note AN887, ?AC Induction Motor Fundamentals?
Motor Control Sensor Circuits
Sensors are a critical component in a motor control system. They are used to sense the current, position, speed and direction of the rotating motor. Recent advancements in sensor technology have improved the accuracy and reliability of sensors, while reducing the cost. Many sensors are now available that integrate the sensor and signal-conditioning circuitry into a single package.
AC switching with TRIAC from TTL Schematics wiring diagram circuits
schema electronic projects.
CK1400 - DC Motor Speed Controller schematics free electronic circuits diagram wiring plans schema projects schematico electrónico schématique diagrama esquemático projeto elektronisch schematisch schematy circuito shema σχηματική αναπαράσταση схема skematisk Schaltbild schematisk
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