Control stepper motor through your computer's parallel port.

Buildan easy stepper motor driver that will allow you to precisely control aunipolar stepper motor through your computer's parallel port.

The project comes with a program that has easy to use graphicalinterface, allows you to control the motor speed, direction inreal-time and it also allows you to use and learn about differentstepping methods, such as single stepping, high torque stepping andhalf stepping modes.

Stepper motor controller also displays an animation that helps youvisualize the current as it flows through individual coils. It is awonderful tool to learn how stepper motors work.

[ more ]

 

READ MORE - Control stepper motor through your computer's parallel port.

It is late player MP3 with single chip of RHOM

It is late player MP3 with single chip of RHOM. It comprises controller 1.1/2.0, MP3 the decoder of USB, amplifier of ear-phone and the controller of system for the form of files of loading MP3 an ordering of instantaneous of USB, orders hard USB or orders CD-ROM of USB/DVD-ROM that all in an ordering of instantaneous of USB of chip

AOnce is connected, BU9432 seeks automatically files MP3 for the playback. Accoustics is ordered by the tactile buttons; Play, pause, stop, nearest, preceding, Fol+, Fol-, +10, -10, Volume+, volume, repetition, random. Can BU9432 the information of posting also on option on the liquid crystal display such as the shirt #, file #. The playback Time (minute, second), the name and the file name.

U9432 of shirt can decode VBR MP3, MP2, MP1, layer 1, 2, 3 files with the rate of taking away: 8K - 48KHz and binary rate: 8Kbps - 448Kbps. It can also identify the ordering of instantaneous of hard USB FAT16 and FAT32/commande of the capacity of 32MB with 2TBytes. The audio playback is exceptionally good with the report/ratio of the signal-to-noise 93dB and the dynamic range 88dB. With this type of piece you can make your clean iPOD;)  for more info go here http://electronics-diy.com/store.php?sel=kits

READ MORE - It is late player MP3 with single chip of RHOM

PCM2706 High Fidelity USB Soundcard / USB Headphones

This is a high fidelity external USB Soundcard / USB Headphones project that can be built for your PC or Mac. It is based on the latest PCM2706 IC which functions as a high quality, crystal clear 16-BIT Stereo DAC. It is a single chip digital-to-analog converter that offers two D/A output stereo channels, digital S/PDIF output and requires very few external components. PCM2706 includes integrated USB 1.0 & USB 2.0 compliant interface controller and it is conveniently powered directly from USB connection. PCM2706 is a USB plug-and-play device and does not require any driver installation under Windows XP and Mac OSX. Link

READ MORE - PCM2706 High Fidelity USB Soundcard / USB Headphones

4bit digital compass

 

Here's a nifty project I found off of Hackaday - how to build your own 16 point (4bit) digital compass. Instead of using the popular 3bit Dinsmore compass the author decided to build his own.

The author attached a magnet to a reflective encoding disk. Using four infrared photoreflectors he was able to read the position of the disk and thefore the magnet.

For those that aren't so clever as to create your own electric compass, the popular Devantech compass works.

READ MORE - 4bit digital compass

Digital Voltmeter.

Build an inexpressive 0.1 - 199.9V LCD digital voltmeter that can be easily configured as amper and temperature meter. This module is based on a popular ICL7106 IC that can measure its own voltage supply and offers very low power consumption. Link

READ MORE - Digital Voltmeter.

Build 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. Link

READ MORE - Build BH1417 Stereo PLL FM Transmitter

New TX200 transmitter with optional PLL and stereo encoder.

Here is the latest and greatly improved TX200 VFO/VCO FM transmitter. The most versatile transmitter to date that can be turned into high fidelity stereo PLL based 200mW FM transmitter. It is a perfect circuit for transmitting your music around the house and yard. TX200 uses only two coils; one in the oscillator and the other one in the 200mW VHF amplifier so it should be fairly easy for anyone to build. Link

READ MORE - New TX200 transmitter with optional PLL and stereo encoder.

Open source MP3 player kits

Here are a couple open source MP3 player kits, PCB/schematics & source are all available - Link.

READ MORE - Open source MP3 player kits

HOW TO - Make a wireless LCD

Max is on a roll, here he show you how to make graphic LCDs go “wireless” by using ACODE-300 bluetooth modules - Link.

READ MORE - HOW TO - Make a wireless LCD

RF-Condenser microphone circuit

Here's how to make a RF-Condenser microphone circuit that's similar to a Sennheiser MKH series mic, Uwe writes - "This RF-circuit is operating at 7.68 MHz and 48 V phantom power supplied. It is tested with a large diaphragm cardioid capsule from Ralf Falk, who himself is designing a LF tube microphone and with a small diaphragm capsule from a Sennheiser MKH415... Lots of experiments, gathered experiences and improvements during the development - with quite satisfactory results, to my point of view." - Link.

READ MORE - RF-Condenser microphone circuit

HOW TO - Make a HI-FI Stereo FM transmitter

Here's how to make a high quality stereo FM transmitter - "Whether you want to create your own radio station, transmit the music around the house, or simply create a wireless link between your iPod and a receiver in your car, this transmitter will let you do these things easily. With BA1404 HI-FI Stereo transmitter you will be able to transmit MP3 music from your iPod, computer, discman, walkman, TV / SAT receiver, and many other audio sources."  Link.

READ MORE - HOW TO - Make a HI-FI Stereo FM transmitter

Washing Microcontroller Timer

Did you ever face that, your washing m/c already run out the mechanical timer dial? After using for several times, the dial gir may worn out, and than it can not move anyhow. 

Many washing m/c shell in the market has mechanical controlled sequence for activated the timer and the sequence back and forth for their motor; washing motor or spinning motor. Spinning motor control only has one direction only, and its simple could be changed to the discrete mechanical timer which sell on the market. But washing motor control has 2 direction for this purpose, it means to squeeze the clothes, it must go to forward and then reversed. Link

READ MORE - Washing Microcontroller Timer

New Schematics

USB and GLCD expansion board for 8051 SBC Victoria TAFE programmer (based on AT89C2051) Way small web server Wisp628 ISP Microchip PIC Programmer WLoader - PIC16F877 application loader / bootloader Zilog Z80 thermostat embedded web server

READ MORE - New Schematics

Controlling LED Arrays on TCP/IP Networks

The new Color LED matrix controllers from Spark Fun Electronics provide a fun way to control 8 x 8 color (RGB) LED matrices. Connecting directly onto a common cathode RGB 8 x 8 LED array, the controller "back pack" provides a simple serial interface to the LEDs. This eliminates the headaches of switching 192 discrete LEDs on and off.
While this is all nice, we still need some way to control the LED controller; something that will send it the image data. This tutorial focuses on controlling one or more LED matrices over TCP/IP using an embedded ethernet board. The LED array becomes a server on the network and may be updated from any computer on the network running a simple JAVA client program. This is a versatile way to control the matrix and it allows for huge expansion. In this tutorial, one LED matrix is connected to the network. But using the same techniques, many LED matrices may be controlled over the network. And if this network is connected to the internet and properly set up, the LED matrices may be controlled from anywhere in the world! LINK

READ MORE - Controlling LED Arrays on TCP/IP Networks

Bingo!!! (on your tv)

This design is based on the video DVM and cronograph design. It supports color, so numbers not yet drawn (all but 1 and 87 in the picture on the left) are displayed in green and the others in white. White lines are intentional, according to the Italian rules the drawer itself takes place in game choosing one of the six regions.
more infomation visit Bingo!!! (on your TV)

READ MORE - Bingo!!! (on your tv)

Rain detector

Rain Detector #1:

Rain Detector #2:

READ MORE - Rain detector

Good UHF Schematics

Good UHF Schematics CMOS Inverter VCO tunes octave to UHF: 11/19/98 EDN-Design Ideas

UHF T Volt Preamplifier:

READ MORE - Good UHF Schematics

Keypad Circuits

µC Provides Wireless Keypad Control: 10/08/98 EDN-Design Ideas

4 Bit µP`s a / D Converter Decodes Keypad`s Inputs: 10/13/94 EDN-Design Ideas

4 Digit Keypad:

Alarm Control keypad:

Decimal to BCD Convertor: This circuit will provide an output in Binary Coded Decimal from any of the input switches. The input switches may be expanded to 16 switches, providing a Hexadecimal to BCD conversion.

READ MORE - Keypad Circuits

Fiber Optic

Simple CATV Upstream Fiber Optic Receiver Uses DC Pilot AGC: 01/20/03 Electronic Design - Ideas for Design / Upstream fiber links in a community antenna television (CATV) system are usually among the most difficult elements of the network to align properly. Set-top boxes and cable modems employ "long-loop" automatic gain control (AGC) (in other words,...

Simple Circuit Uses Optical Fiber To Send Relative Humidity Data : 04/01/02 Electronic Design - Ideas for Design / The circuit shown in the figure measures relative humidity in air at the low temperatures found in applications like cold storage of food items and greenhouses. Instead of using electrical signal cables that...

READ MORE - Fiber Optic

Tracking ADC

A third variation on the counter-DAC-based converter theme is, in my estimation, the most elegant. Instead of a regular "up" counter driving the DAC, this circuit uses an up/down counter. The counter is continuously clocked, and the up/down control line is driven by the output of the comparator. So, when the analog input signal exceeds the DAC output, the counter goes into the "count up" mode. When the DAC output exceeds the analog input, the counter switches into the "count down" mode. Either way, the DAC output always counts in the proper direction to track the input signal.

Notice how no shift register is needed to buffer the binary count at the end of a cycle. Since the counter's output continuously tracks the input (rather than counting to meet the input and then resetting back to zero), the binary output is legitimately updated with every clock pulse.

An advantage of this converter circuit is speed, since the counter never has to reset. Note the behavior of this circuit:

Note the much faster update time than any of the other "counting" ADC circuits. Also note how at the very beginning of the plot where the counter had to "catch up" with the analog signal, the rate of change for the output was identical to that of the first counting ADC. Also, with no shift register in this circuit, the binary output would actually ramp up rather than jump from zero to an accurate count as it did with the counter and successive approximation ADC circuits.

Perhaps the greatest drawback to this ADC design is the fact that the binary output is never stable: it always switches between counts with every clock pulse, even with a perfectly stable analog input signal. This phenomenon is informally known as bit bobble, and it can be problematic in some digital systems.

This tendency can be overcome, though, through the creative use of a shift register. For example, the counter's output may be latched through a parallel-in/parallel-out shift register only when the output changes by two or more steps. Building a circuit to detect two or more successive counts in the same direction takes a little ingenuity, but is worth the effort.

READ MORE - Tracking ADC

Buffer circuits

300V PEAK TO PEAK SIGNAL GENERATOR (54) (300vpp) This circuit converts a square wave signal to a +-150 volt output signal with fast 100nS rise and fall times.

READ MORE - Buffer circuits

Bridge circuits

16w bridge amplifier

Circuit adds programmability to sensor amplifier: Design Ideas / The pressure-sensor amplifier circuit of Figure 1 offers a number of advantages over the traditional approach using the classic three-op-amp instrumentation amplifier. The circuit can operate from a single supply and uses only two op amps and 1% resistors. If the reference voltage, VREF, is 0V, the transducer gain for the circuit isTo ensure equal gain for the two ground-referenced volt... .

Design Approach Simplifies Signal Conditioning

Programmable Gain Amplifier is Low Cost

RC Network Eliminates Precision Reference

Signal Chopping Enhances Bridge Performance

READ MORE - Bridge circuits

Cell Phone

Cell-Phone-Controlled Audio/Video Mute Switch:

Cellular Phone calling Detector: Flashes a LED when detecting an incoming call. Powered by one 1.5V cell

Cordless Phone Backup:

Dualvoltage Supply Powers SIM Card: 01/20/00 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit.

READ MORE - Cell Phone

Inverter Circuits

12 Volt Automotive Inverter : This circuit will allow you to operate small devices like laptop computers inside your automobile without an expensive automobile power supply. The circuit takes advantage of the fact that power transformers are linear devices and can be used to step up as well as step down.

12 Volt DC to 120 Volt AC Inverter: this inverter should solve that problem. It takes12 VDC and steps it up to120 VAC. The-Wattage depends on which transistors you use for Q1 and Q2, as well as how "big" a transformer you use for T1. The inverter can be constructed to supply anywhere from1 to1000 (1 KW)-Watts.

READ MORE - Inverter Circuits

Microcontroller schematics

Programmer for the 68HC705C8 MicroController

Programmer PIC16F84,12C50x and EEPROM 24Cxx

PS/2 keyboard keystroke logger based on Atmel 89C2051

Rotating Sprocket Wheel Generator (PIC16F84)

RS485-like multi-drop bus with half duplex serial protocol

ScanMate audio activated recorded

Serial to parallel converter using the AT89C2051

Ser-Key 10-Key Serial Keypad Encoder

Simple RS232C Level Converter using Transistors

Smart card programmer

READ MORE - Microcontroller schematics

SUN SWITCH 2N3055

2N3055, look fantastic. can do very well as a phototransistor, like this schematics. This Power transistor should be light sensitif and it can do with cutting of up side transistor. the sensitif area which more wide can do like the new phototransisitor and do very sensitif.

READ MORE - SUN SWITCH 2N3055

1 Watt 2.3 GHz RF Amplifier Using a MRF2001

Simplicity and repeatabilty are feature in this 1-watt
S-Band amplifier design. The desing uses an MRF2001 transfer as a common base. Class C amplifier The amplifier deliver 1-watt output wi:r 8 dB minimum gain at 24 V. and Is tunable tram 225 to 235 GHz, Applications include microwave communications eqwpm.nt and other systems requiring medium power, narrow band amplification

More information Visit This Site

READ MORE - 1 Watt 2.3 GHz RF Amplifier Using a MRF2001

Infra/radio remote control transmitter/receiver with PIC

This is a general purpose remote control project with using programmable PIC microcontrollers. Schematics are shown for using infrared (RF) or radio (RF) media. If you are not familiar with microcontroller programming, you can use fixed encoder and decoder integrated circuits instead. Well-known such IC-s are Holtek HT-12D, HT-12E and Motorola MC145026, MC145027, MC145028.
for more information Visit This Site.

READ MORE - Infra/radio remote control transmitter/receiver with PIC

Car anti theft wireless alarm

This FM radio-controlled anti- theft alarm can be used with any vehicle having 6- to 12-volt DC supply system. The mini VHF, FM transmitter is fitted in the vehicle at night when it is parked in the car porch or car park. The receiver unit with CXA1019, a single IC-based FM radio module, which is freely available in the market at reasonable rate, is kept inside. Receiver is tuned to the transmitter's frequency. When the transmitter is on and the signals are being received by FM radio receiver, no hissing noise is available at the output of receiver. Thus transistor T2 (BC548) does not conduct. This results in the relay driver transistor T3 getting its forward base bias via 10k resistor R5 and the relay gets energised. When an intruder tries to drive the car and takes it a few metres away from the car porch, the radio link between the car (transmitter) and alarm (receiver) is broken. As a result FM radio module gene-rates hissing noise. Hissing AC signals are coupled to relay switching circ- uit via audio transformer. These AC signals are rectified and filtered by diode D1 and capacitor C8, and the resulting positive DC voltage provides a forward bias to transistor T2. Thus transistor T2 conducts, and it pulls the base of relay driver transistor T3 to ground level. The relay thus gets de-activated and the alarm connected via N/C contacts of relay is switched on. If, by chance, the intruder finds out about the wireless alarm and disconnects the transmitter from battery, still remote alarm remains activated because in the absence of signal, the receiver continues to produce hissing noise at its output. So the burglar alarm is fool-proof and highly reliable.

READ MORE - Car anti theft wireless alarm

Ultrasonic Pest Repeller

We also agree, pest is not invited guess. So it is the Pest repeller Schematic.
IC CMOS 4047 Operate as low oscillator which the frequency can adjust bettwen 5 khz until 30 khz with trimpot P1.
each output Q and Q' feed to inverter Driver 4050 IC2 and IC3. Sixth stage in this IC connect to posible direct driving T1/T2 and T3/T4.
T1 and T4 also T2 and T3 compact conduct.The couple of transistor can driving the cheap piezo tweeter.

READ MORE - Ultrasonic Pest Repeller

AT90LS8515 PBX / VIRTUAL PBX

in this project, we demonstrate the 4 line telephone PBX systems with full signaling and switching functions similar to those of the central office systems PBX. It's Not Virtual PBX .Dial tone, busy tone, and ring tone are provided during call progress. Ringing is generated at the receiving end of the phone being called. Switching employs integrated circuit (IC) matrix switches on four buses. Thus, this PBX system is expandable to 8 lines (4 pairs) if more hardware is added. This PBX system is switching on the Dual Tone Multi Frequency (DTMF) dialing signal and does not work with pulse dialing signal founded in some older phones.in Virtual PBX, we use IP telephone System. But it's difficult, if we make own.

Schematics visit this site

READ MORE - AT90LS8515 PBX / VIRTUAL PBX

H-Bridge Motor Driver

H-Bridge Motor Driver
A wiring diagram, photograph, and movie of an H-bridge dc motor driver circuit implemented with a TC4424A, TC4427A, or MAX4427 dual MOSFET driver IC. Very useful for running small bot gear motors.

Sweet! The Line-Following Robot An m&m's candy container provides a fun body for a smart line-following robot. Videos show the auto-contrast, dark-or-light detection capabilities. Sharp turns and crossovers don't slow this car down, but it can automatically stop at the end of the line.

READ MORE - H-Bridge Motor Driver

RS-232C multiplexer serves as multiport adapter

Multiport RS-232C PC add-on boards are intended for intensive multichannel communication. Therefore, each serial port has its own transmission controller. If your application doesn't need interrupt-driven service, and polling the devices through RS-232C channels one after another is sufficient, then you can use a single controller with switched input and output signals instead of installing a costly multiport adapter.
The ISA bus directly controls the eight-channel multiplexer in Figure 1. The GAL20V8 integrates the address decoder and other glue logic. The latched address and gating signals drive the DG509A analog multiplexers that actually switch the TXD and RXD lines. The circuit automatically selects channel 0 upon system reset (you can download PLD equations from EDN's ftp site). The analog multiplexers feature both overvoltage protection and break-before-make switching so that the circuit operates safely over the ±12V range.

You can easily scale the number of available channels from four to sixteen by using four multiplexers and two decoders with opposite SEL settings. One PLD can accommodate four multiplexers if you decode additional E₂ and E₃ enable signals from Q₂ and Q₃. You can also connect the multiplexers in parallel to switch other signals. (DI #1832)

READ MORE - RS-232C multiplexer serves as multiport adapter

Water Level Monitors

• 12 Volt Sump Pump Control:
• 12 Volt Toilet Tank Refiller:
• Circuit checks swamp cooler water level: 10/31/2002 EDN - Design Ideas / A "swamp cooler" is an easy way to obtain effective air conditioning, especially in hot and dry climates, if a water source is readily available. Although most units are very reliable, the storage-reservoir control usually uses a single level-detector component. Failure of this component can lead to serious water damage..
• Digital Water Wave/Tide/Level Meter (PIC16F876):
• Simple Emergency Sump Pump Control: Sump Pump Control for12V DC Bilge Pump
• Water Activated Alarm:
• Water Level Alarm:
• Water Level Controller:
• Water Level Indicator With Alarm:
• Water Level Sensor:
• Water-Level Controller:
• Water-Level Sensor Uses Hysteresis: 08/21/00 Electronic Design - Ideas for Design / A low-voltage electronic circuit that senses upper and lower water levels is often used for alarms and sump-pump activation. Since an electronic sensor has no moving mechanical parts, it eliminates problems with corrosion and wear and tear. The. . .
• Waterpump Safety Guard for Fish-pond:

READ MORE - Water Level Monitors

Tachometers / RPM Circuits

AN-162: LM2907 Tachometer/Speed Switch Building Block Applications: National Semiconductor - Application Note

Digital Tachometer Avoids Analog Vices: 11/10/94 EDN-Design Ideas / The digital tachometer in Fig 1a is a component of the digital seek servo loop in Fig 1b. The loop produces an error signal that causes a motor to follow a sophisticated velocity profile (Fig 2). Although you could use an analog tachometer, the digital one costs less, performs better, is less sensitive to temperature, and implements easier in a custom IC....

LM2907 Tachometer/Speed Switch Building Block Applications: National Semiconductor - Application Note

READ MORE - Tachometers / RPM Circuits

Programmable Digital Ignition

Two Stroke CDI (Capacitive Discharge Ignition)

The next schematic shows the coil configuration at magnetic plate and the position of the pick-up at the outer sider of the plate. This pick-up is triggered by the step on the plate. Below are shown the signals measured by means of an oscilloscope at the output of the magetic plate, and the output of CDI for the primary of the HV coil.

detail

READ MORE - Programmable Digital Ignition

Programmable CDI Ignition with PIC16F84

Features::
-As simple as possible
-Programmable advance control
-Use no exotic hard-to-find components
-Use a normal 4.8V RX battery
-Integrated spark test function, no signal generator is needed.
(makes 4 or 140 sparks/second without the need for a trigger input)
-Spark control can be separated from the voltage board
(to be used as a front end for a CDI without advance)
-Integrated strobe light
-May be extended with a failsafe/engine stop module. (not designed yet)

for more information visit this site

READ MORE - Programmable CDI Ignition with PIC16F84

New Ultrasonic Sensor for Hobbiests

Look out Devantech, there's a new kid on the proverbial block, the robotics-block, that is. While the ultrasonic sensor line from Devantech has turned into a staple for many hobby robots, it looks like there might be another viable contender. Check out the Ultrasonic Range Finder from Maxbotix, which is listed for $24. A FAQ and datasheet on the sensor are available on Maxbotix's website. The specs on the device say it can range from 0 to 6.45 meters (0 - 256 inches), and outputs in either serial, analog, or PWM signals.

PS. Maxbotix or Devantech, if you're listening, how about sending some of your stuff our way for reviews?

READ MORE - New Ultrasonic Sensor for Hobbiests

Video related schematics

· Video Clock Superimposer

· Simple TV transmitter

· Audio / video distribution amplifier

· 10GHz video link

· Experimental macrovision remover

· 8 x 8 Audio-video switch

· VHF/UHF TV modulator

· LH0032 video amplifier

· LM359N video amplifier

· Macrovision code remover

· 2.3GHz ATV Transmitter

· Driver for multiple VGA monitors

· CCD (charge coupled device) support board

· 8-input 2-channel Audio and Video Switch with Keypad control

· AM modulator to add AM television to small FM transmitter

· Video amplifier

· Closed-Caption Decoder

· PIC-Tock video clock

· Video/Audio Wireless Transmitter

· Video signal amplifier

· RGB video digitizer

· Digital video processor

· MC1374 based TV transmitter

· TV transmitter

· Simple TV transmitter

· Color Bar Generator

· Microcontroller test pattern generator

· NTSC Video Distribution Amplifier

· Commodore RF modulator

· Video signal edge enhancement

· Video amplifier

· Video stabilizer

· Video/Audio Wireless Transmitter

· 4 Stage 555 Timer for Video Cam Control

· Digital volt meter with video output

· VHF Audio Video Transmitter

· LH0024 video amplifier

· Video to RF Modulator

· Video switcher (PDF)

· Video switcher

· TV/Radio antenna cable galvanic isolator

· S-video to composite video adapter

· VGA converter for video projectors and fixed frequency monitors

· VGA to TV converter

· VGA to PAL and NTSC converter

· PIC micro frame grabber (TDA8708)

· Low cost audio/video modulator and transmitter

· Many video amplifier circuits includiing transmission over UTP (PDF)

· Commodore 64 Video Modulator 251025 Schematics

· Commodore 64 Video Modulator 251696 Schematics

· TV RGB signal output from a SVGA graphics card

· Macrovision removal

· Panasonic TR-329B AC-DC Portable TV

· Homebuilt video digitizer Mark I

· Homebuilt video digitizer Mark II

· TV transmitter (PDF)

· CCD camera frame grabber

READ MORE - Video related schematics

Motor and general control schematics

· Bridge head

· PWM motor controller

· Transistor relay driver

· Latching relay driver

· Relay delay circuit

· Touch switch

· Low voltage DC motor speed controller

· Flashing neon christmas lights

· Three input first response monitor

· Switch-on delay circuit

· Electronic thermostat

· LM3911 temperature controller

· Programmable light-activated relay

· Light activated relay

· Simple 10 Stage Control Box

· Simple PWM circuit

· H Bridge Motor Control Circuits

· Motor speed controllers

· Ceiling fan speed control

· Delayed off light switch

· Deoderizer fan timer

· Electronic Thermostat Relay Circuit

· Interfacing 5 volt CMOS to 12 volt loads

· Light Activated Relay

· CMOS Toggle Flip Flop With Relay(CD4013)

· 555 Timer Monostable Circuit Using Pushbutton

· Dual Channel Servo Pulse to H-Bridge Interface

· Current loop interface

· Switching solenoid driver

· Modular relay system

· Light/dark detector

· Pulse Width Modulation DC Motor Control

· Stepper motor controller

· Touch switch

· Pump controller

· DTMF controlled switch

· H-Bridge motor controller (5 amps, 100 watts)

· Dual Channel Servo Pulse to H-Bridge Interface

· Servo pulse to PWM converter

· 12V Sump Pump Control

· Rolling code 4-channel UHF remote control

· DC Motor Speed Controller

· 3 Phase Brushless DC Motor Xtal Based Controller

· DC motor controller

· Garden moisture controller

· Overload Voltage Protection with Automatic Reset

· Pulse Width Modulator

· Pulse Width Modulator Motor Speed Control

· Pushbutton one-shot and latch (PDF)

· Charge coupled bi-directional power MOSFET relay (PDF)

· Finger touch activated switch (PDF)

· Machine vibration triggers hour meter (PDF)

· Solid state relay (PDF)

· Line-powered Xenon flash transmitter (PDF)

· 9V Xenon photoflash controller (PDF)

· AC switching with TRIAC from TTL

· Control 120VAC relay with TTL

· Driving a relay with a CPU

· Power-line Appliance Controller

· DC Motor Constant Speed Control

· Simple Switched Servo Driver

· Combination-controlled, fully customizable RF remote control

· Thermoelectic controller (scriptable thermometer)

· Stepper motor positioner

· Stepper motor driver

· Thermostat

· Frequency switch

· PIC16F84 RF remote controller

· H-Bridge shematic

· DS1821 programmable thermostat

· SN754410 Dual Motor Driver Board

· Hot Water Tank Indicator

· Temperature monitor

· Cold activated switch

· Voltage comparator switch

· Dark activated switch

· DC Push Button Motor Control Circuit

· Light detector

· DC Motor Reversing Circuit

· Sound operated switch

· LDR light/dark activated relay switch

· Touch Switches

· 6090 digital decoder schematics

· Assorted relay control circuits

· Adjustable Voltage motor controller

· Serial servo controller

· DC Motor-Driver H-Bridge Circuit

· Furnace fan speed controller

· Remote two-wire stepper motor positioner

· Drill shaft speed monitor

· PWM Motor Speed Controller / DC Light Dimmer

· Constant Temperature Circuit

· PWM DC Motor Speed Control

· Solenoid starter

· CO2 controller for planted tanks

· Light activated relay

· Voice activated switch - MC2830

· Delayed shutter control for Kodak DC-20

· Gasoline generator automatic throttle controller

· Block power switching module

· MOSFET H-BRIDGE schematic and theory

READ MORE - Motor and general control schematics

Model and remote control schematics

· Snake throat muscle controller

· Handy cricket for robotic applications

· Incline Railway Control Circuit

· A Receive Signal Decoder

· 27Mhz toy car receiver

· 27Mhz toy car transmitter

· One ounce rocket ejection timer

· LED traffic lights

· Two-tone siren

· Proportional radio remote control

· Alf: The Robotic Matchbox car

· Seaplane schematic

· Model Rocket with Video Camera

· Signal breaking module

· RF serial link for robot

· PIC based rocket altimeter

· Robot with PIC16F84 brain & InfraRed eyes

· 0-10V control for RC servos

· Robotic microcontroller board

· Autonomous airplane

· Multi Rocket Launcher

· Model rocket launch controller

· Pad launch controller for model rockets

· Simple flashing light circuit

· Simple flashing light circuit

· A dual alternating flashing light circuit

· Simple flashing light circuit

· A dual tandem flashing light circuit powered by a 9 volt battery

· Simulate the Gyralite (dual flashing headlights).

· Simple train detector using ambient light and a photocell

· Simple charge rate monitor

· Deluxe charge rate monitor

· "CLONEPAC" memory module for Futaba 8UAF/8UAP

· Battery pack discharger

· Plane locator

· Plane locator 2

· Battery low voltage alarm

· Battery low voltage alarm 2

· Ultimate battery low voltage alarm

· R/C digital camera controller

· R/C helicopter camera

· Building an RF Remote Control System

· Motor walker circuit

· Two tone train horn

· R/C Emergency locator alarm

· Remote switch for radio-control aircraft accessories

· Radio Control Battery Backup

· Glow Plug driver for model engines

· 12 relay launcher for model rockets

READ MORE - Model and remote control schematics