Taking the Uncertainty Out of Thermocouple Temperature Measurement:  AN-274 Analog Devices Application Note   (app note added 6/06)

TB063: An Integrated Fan Speed Control Solution can Lower System Costs, Reduce Acoustic Noise, Power Consumption and Enhance System Reliability:  Microchip Application Note Published 24-Feb-03   (app note added 6/06)

TC64x/TC64xb Demo Board for Fan Speed Controllers:  Fan control module allows the user to quickly prototype fan control circuits based on the TC642 or TC646 PWM Fan Control IC's. Its uses though hole components for easy user assembly and evaluation.  (app note added 6/06)

Telephone Operated Remote Control using PIC16F84a Microcontroller:  This design controls up to 8 devices using a PIC microcontroller (PIC16F84A) connected to the phone line. The unique feature here is that unlike other telephone line based remote control, this device does not need the call to be answered at the remote end so the call will not be charged. This device depends on number of rings given on the telephone line to activate/deactivate devices....   (added 10/05)

Telephone Record Control:  This circuit will allow you to connect any tape recorder that has a mic and remote input to a phone line and automatically record both sides of a conversation when ever the phone is in use. You will need to take a couple of voltage readings before connecting the circuit. First determine the polarity of your phone line and connect it to the circuit as shown and then determine the polarity of the remote input and connect it to the circuit. (added 6/06)

TeleRemote Control:  (circuit / schematic design added 6/06)

Temperature Controlled NiCd Charger:  (diagram added 6/03)

Temperature Controlled Ovens:  (electronic circuit added 7/03)

Temperature Controller Based on AT89Cx051:  The TempRat is going to be a little device to switch things off if the ambient temperature rises above a definable level. A certain time before switching off, a message is sent down the serial link to the host computer telling it how long until the power will be switched off. The TempRat will then switch things back on once it thinks the temperature has gone back to normal. The TempRat displays the ambient temperature on a 2 digit display, and also sends the temperature down the serial link once a minute for a c omputer to log or monitor. All critical temperatures and time delays are settable, and stored in EEPROM in case the power fails. The TempRat has an operating temperature range of 0 degrees to 70 degrees. (added 6/06)

Temperature Controller has Take Back Half Convergence Algorithm:  09/15/05   EDN -Design Ideas  /   (added 11/05)   Enhanced closed-loop control balances stability, responsiveness.

Temperature Controller Keeps IR Detector at 8ºK:  06/08/95 EDN-Design Ideas / (added 3/03)

Temperature monitor and fan controller reduce fan noise:  05/10/01 EDN-Design Ideas  / (added 6/06)

Temperature Monitor:  (schematic / circuit design added 9/02)

Temperature Programmer uses Digital Control:  07/18/96 EDN-Design Ideas / (added 3/03)

Temperature Regulator #2:  (electronic circuit added 5/02)

Temperature Sensitive Oscillator:  Temperature controlled based on AT89CX051 (added 6/03)

Temperature-Based Fan Control using the MAXQ2000 Microcontroller:  App Note 3620: Maxim IC  (application note added6/06)

The Smart Start ™ Technique for BLDC Motors / ABR-42020:  Fairchild Application Notes / (app note added 6/06)

The Subscriber Line Card in a Distributed Control Switching System:  National Semiconductor Application Note   (app note added 6/06)

Theremin Controller:  (circuit / schematic design added 6/06)

Thermo Cooling Fan:  fan controller, which controls fan based on temperature (added 5/02)

Thermocouple Signal Conditioning Using the AD594/AD595:  AN-369 Analog Devices Application Note   (app note added 6/06)   This application note reviews thermocouple basics and illustrates circuit designs for thermocouple signal conditioning using the AD594/AD595.

Thermoelectric Controller (Scriptable Thermometer):  A unified thermometric controller that can be programmed with simple scripts, integrating the "classic" thermometer/controller pair. You can build a variety of simple machines with the same hardware and a different script : a charting thermometer, a vending machine that dials your number when empty, a leavening cell....   (added 09/05)

Thermostat for 1KW Space Heater (SCR controlled):  Here is a simple thermostat circuit that can be used to control a relay and supply power to a small space heater through the relay contacts. The relay contacts should be rated above the current requirements for the heater. Temperature changes are detected by a (1.7K @ 70F) thermistor placed in series with a 5K potentiometer which produces about 50 millivolts per degree F at the input of the LM339 voltage comparator. The two 1K resistors connected to pin 7 set the reference voltage at half the supply voltage and the hysteresis range to about 3 degrees or 150 millivolts. The hysteresis range (temperature range where the relay engages and disengages) can be adjusted with the 10K resistor between pins 1 and 7. A higher value will narrow the range....   (added 6/06)

Three-Phase Brushless Motor RPM Controller :  The TPIC43T01/02 is a monolithic motor control integrated circuit designed to provide RPM control to a 3-phase brushless dc motor. The device provides two analog sensor input ports which include a speed sensor interface and a Hall effect position interface. The speed feedback interface consists of an FG amplifier to receive an external sinusoidal signal from a variable reluctance pickup and convert it to a digital speed signal for the control circuit. When the motor speed.... (application note added 10/06)

Time delay relay uses proximity control:  03/15/01 EDN-Design Ideas / (added 6/06)

Timer controls DSP filter frequency resolution:  04/13/95 EDN-Design Ideas / (added 6/06)

Trace-dimension control reduces crosstalk:  02/17/97 EDN-Design Ideas / (added 6/06)

Traffic Light Control Circuit (74145):  This page features a very basic traffic light circuit that is built around the TTL family 74145 -1 of10 Decoder. The circuit is designed to drive light emitting diodes that are connected in a common anode arrangement. (added 6/06)

Traffic Light Controller:  controls on3 LED traffic light sequence (added 7/03)

TRIAC Light Controller #2:  (diagram added 6/03)

TRIAC Light Controller:  This project is intended for controlling mains powered disco lighting, although there are many other possible uses for controlling almost any mains appliance. It will control five seperate channels at up to 3 Amp per channel. This could be increased by designing another PCB with wider tracks than the PCB included with this design. I could have used relays to control my lights, but triacs seemed like a more sensible solution as they react quicker and are totally silent as they contain no mechanical parts. The low voltage control side and the mains side are totally isolated, as opto-couplers are used to fire the triacs. I have not included any schematics as this project is very simple, expecially due to the fact I have included a PCB...  (added 2/06)

Two Chips Simplify Layout for High-End Embedded Control:  04/10/99 EDN-Design Ideas / (added 6/06)  [Note:  File contains multiple circuits.  Scroll to find this one.]  If you are considering using one of the 32or 64-bit RISC µPs from Integrated Device Technology (IDT), the company’s new RC32134 and RC64145 system-controller ICs (Picture) can make your job easier. The chips provide synchronous-DRAM, memory, and I/O control; a PCI interface; and peripherals, including UARTs, timers, and interrupt controllers. The 32134 for the RC32364 µP provides a glueless interface to DRAM and a 32-bit, 33-MHz PCI function. The 64-bit part supports a number of IDT’s 64-bit RISC µPs and provides a 32-bit, 66-MHz PCI function for higher bandwidth....

Two Components Drive Stepper Motor:  01/19/95 EDN-Design Ideas / (added 6/06)

Two Signals Easily Control Tricolor LED:  09/14/95 EDN-Design Ideas / (added 6/06)

Two Wire Remote Microphone Amplifier :  (electronic diagram added 6/03)

Two-wire Lamp Flasher:  This circuit has been designed to provide that continuous light lamps already wired into a circuit, become flashing. Simply insert the circuit between existing lamp and negative supply. Especially suited for car or panel pilot lights, this device can drive lamps up to 10W....  (design added 10/06)

Ultra-Bright LED Lamp:  (circuit / schematic design added 6/06)

Ultrasonic Remote Control and Alarm:  (circuit / schematic design added 6/06)

Ultrasonic Switch:  Circuit of a new type of remote control switch is described here. This circuit functions with inaudible (ultrasonic) sound. Sound of frequency up to 20 kHz is audible to human beings. The sound of frequency above 20 kHz is called ultrasonic sound. The circuit described generates (transmits) ultrasonic sound of frequency between 40 and 50 kHz. As with….  (added 10/05)

Universal Infrared Controller for a PC:  This simple circuit allows you to record any Infrared remote control signal on your PC, and then play it back. This is particularly useful if you want to control appliances such as TVs, VCRs, CDs etc. from your computer. The device simply connects to the parallel port of your PC. You can also use this circuit to analyze the waveform from any Infrared remote control. This circuit was originally published in Electronics Australia, September1998 (added 4/02)

Universal Infrared Remote Control:  Infrared remote based on Atmel 89C2051 (added 6/06)

Use a switching-regulator controller to generate fast pulses:  4/13/06  EDN Design Ideas  /  (added 10/06)  Switching-regulator-controller ICs can deliver gate-drive pulses with rise and fall times of less than 2 nsec, making them ideal candidates for laboratory pulse-generators.

Using a Light Dimmer IC for AC Motor Speed Control:  This circuit example uses LS7231 Light Dimmer IC (added 6/06)

Using CAN Networking for Cost Effective DC Motor Control in Vehicle Body Electronics:  National Semiconductor Application Note   (app note added 6/06)

Using COP800 Devices to Control DC Stepper Motors:  National Semiconductor Application Note   (app note added 2/06)

Using the AD2S80 Series Resolver-to-Digital Converters as Control Transformers:  AN-203 Analog Devices Application Notes  (app note added 6/06)

Using the AD7877 Touch Screen Controller and the Intel PXA250 Processor Under Windows CE.NET:  AN-738 Analog Devices Application Notes  (app note added 2/06)

Using the ADT7461 as a Multichannel Temperature Sensor:  AN-702 Analog Devices Application Note   (app note added 2/06)

Using the LMX5001 Bluetooth Link Controller:  National Semiconductor Application Note   (app note added 2/06)

Using the Noise Reduction Feature on the AD7877:  AN-766 Analog Devices Application Notes  (app note added 2/06)

Variations on the PWM DC Motor Speed Control:  (circuit / schematic design added 6/06)

Voltage-Based Controller for Switches:  (electronic Circuit / Schematic added 10/04)

Washing Machine Motor Controller:  (electronic Circuit / Schematic added 10/04)

Watchdog-reset catcher aids embedded-system debugging :  11/19/98 EDN-Design Ideas  / (added 6/06)   

Water-Level Controller:  (electronic Circuit / Schematic added 10/04)

Welch Scientific Model 2153c Stroboscope:  a schematic for a typical line operated variable rate stroboscope used for the visualization of moving parts as well as rotation speed or frequency determination of rotating or vibrating machinery (added 4/02)

Wideband Agc Amplifier as a Differential Amplifier:  National Semiconductor Application Note 10-Apr-2000 (app note added 4/02)

Wideband Agc has 60 Db Dynamic Input Range:  10/10/96 EDN-Design Ideas / (added 5/02)  

Wiper Speed Control:  A continuously working wiper in a car may prove to be a nuisance, especially when it is not raining heavily. By using the circuit described here one can vary sweeping rate of the wiper from once a second to once in ten seconds. The circuit comprises two timer NE555 ICs, one CD4017 decade counter, one TIP32 driver transistor, a 2N3055 power transistor (or TIP3055)....  (added 10/05)

Wiper Speed Controller:  (circuit / schematic design added 6/06)

Wireless RF PWM Dual Motor Controller:  (electronic circuit added 4/05)

ZXBM200x Series of Variable Speed 2-Phase Fan Motor Controller:  Zetec Semiconductors  Applications Notes This applications document is intended to aid users in their development of the controller electronics for fan and blower motors using the ZXBM200x series of variable speed, 2-phase, DC brushless motor controllers.   (app note added 6/06)