Hand Clap Lamp Control :  What a way to drive a triac. This is the improved/redesigned version. (added 2/05)

H-Bridge Direct Current Motor Control Circuits:  (electronic circuit added 4/05)

H-Bridge Motor Control Circuits:  (electronic circuit added 4/05)

H-Bridge Motor Control:  general introduction to H-Bridges (added 4/05)

H-Bridge Motor Controller (5 Amps 100 Watts):  This circuit drives small DC motors up to about 100 watts or 5 amps or 40 volts, whichever comes first. Using bigger parts could make it more powerful. Using a real H-bridge IC makes sense for this size of motor, but hobbyists love to do it themselves, and I thought it was about time to show a tested H-bridge motor driver that didn't use exotic parts.... (added 4/05)

H-Bridge Switch for Small Motors:  simple switch circuit for reversing and stopping a motor without any control of speed (added 4/05)

Heating System Thermostat:  (circuit added 9/04)

HFAN-08.2.0: Thermoelectric Cooler (TEC) Control:  App Note 3318: Maxim IC  (application note added6/06)

High Accuracy Synchronous Step-Down Controller Provides Output Tracking and Programmable Margining:  DN364  Design Notes (Linear Technology)  (app note added 1/06)

High Frequency AGC has Digital Control:  05/21/98 EDN-Design Ideas / (added 11/05) Many systems, especially communications, require AGC that functions at 50 MHz. Self-calibrating systems, such as automatic test equipment, need this high-frequency response but also require digital control of the AGC output voltage. During the calibration cycle, the test equipment calculates the AGC output voltage necessary to achieve the accuracy requirements and then increments the AGC output voltage until the system is within specifications. The AGC circuit in Figure 1 uses a DAC to accomplish the digital control, and because the DAC is the reference input of the AGC circuit, the DAC ultimately sets the AGC output voltage. The HI5731 is a good choice for the DAC, IC3, because it is inexpensive, has an update rate as high as 100 MHz, and functions with 5V supplies. Also, its output interfaces well with the AGC circuit....

High Voltage Ring Generator:  Supertex Semiconductors  (app note added 2/06)

Home Built Laser Projector:  Laser projector is one of the laser display equipments. This project builds the closed-loop galvos mainly and aiming at professional grade.  (added 10/05)

Hot Swap and Blocking FET Control using 2 x ADM1073 Hot Swap Controllers:  AN-694 Analog Devices Application Note   (app note added 2/06)

Hot Swap Circuit Meets Infiniband Specification:  DN265  Design Notes (Linear Technology) (app note added 2/06)

Hot Swap Controller Handles Dual Polarity:  12/11/03 EDN Design Ideas  /  (added 1/05)  Some applications require a hot-swap controller, a circuit-breaker function, or both for dual-polarity, dc-input power-supply rails. In some hot-swap cases, the requirement is based only on inrush-current considerations. Control of the inrush current is necessary to eliminate connector stress and glitching of the power-supply rails....

How to Build a 300MHz AM RF Remote Control System:  (electronic circuit added 4/05)

HV809 EL Lamp Driver for Battery Powered and Off-Line:  Supertex Semiconductors  (app note added 2/06)

HV823 and HV825 EL Lamp Driver Circuits :  Supertex Semiconductors  (app note added 2/06)

HV826 EL Lamp Driver Circuits:  Supertex Semiconductors  (app note added 2/06)

HV831 Dual EL Lamp Driver Circuits:  Supertex Semiconductors  (app note added 2/06)

HV832 Dual EL Lamp Driver Circuits:  Supertex Semiconductors  (app note added 2/06)

HV833 EL Lamp Driver Circuits:  Supertex Semiconductors  (app note added 2/06)

HV857 EL Lamp Driver Circuits for Low Audible Noise Or:  Supertex Semiconductors  (app note added 2/06)

HV8XX Series:  Supertex Semiconductors  (app note added 2/06)

IC Controlled Emergency Light with Charger:  (electronic Circuit / Schematic added 10/04)

Implementing Temperature-Based Variable Fan Speed Control in NLX Power Supplies:  Microchip Application Note Published 4-Feb-03   (app note added 6/06)

Improve FET Based Gain Control:  12/06/01 EDN Design Ideas  /  (added 1/05)  One problemwith standard FET gain-control circuits is increased noise when you use the FET as a part of a resistive attenuator in series with an op amp. This configuration attenuates the signal before amplification; hence, it requires much higher gain bandwidth and better noise performance from the op amp. ...

Incline Railway Control Circuit:  (circuit / schematic design added 6/06)

Increasing the High Speed Torque of Bipolar Stepper Motors:  National Semiconductor Application Note   (app note added 2/06)

Industrial Controls:  Intersil Application Block Diagram  (app note added 6/06)

Inexpensive Logic Controls Stepper Motor:  03/26/98 EDN-Design Ideas / (added 6/06)  

Infa-Red Remote Control:  I have received a number of emails requesting schematics for infa-red remotes. So here is one. This remote transmits a tone using an infa-red LED. This tone is decoded by the receiver. Since the receiver only switches when it "hears" the tone, there are no accidental activations.  (electronic circuit added 10/06)

Infra/Radio Remote Control Transmitter/Receiver:  (electronic schematic / circuit added 4/02)

Infrared Circuits for Remote Control:  (electronic circuit added 4/05)

Infrared Gate for Door:  (electronic circuit added 7/03)

Infrared Interface with Windows CD Software:  use infrared technology to remotely control a CD-ROM drive with an audio CD (added 4/02)

Infrared Receiver for Sony Remotes:  receive signals from a standard Sony remote control and send the code bytes(2) received to an RS-232 port, based on PIC16C84 (added 4/02)

Infrared Remote Control #1:  will allow you to turn on any piece of equipment that operates on115 volts AC (added 4/02)

Infrared Remote Control (aaroncake):  simple circuit which controls one relay output (added 4/02)

Infrared Remote Control Extender:  (schematic / circuit design added 9/02)

Infrared Remote Control Tester #1:  measures the relative intensities of different Infrared light sources (added 5/02)

Infrared Remote Control Tester #2:  (electronic Circuit / Schematic added 10/04)

Infrared Remote Control Timer:  (electronic Circuit / Schematic added 10/04)

Infrared Remote Control:  (circuit / schematic design added 6/06)

Infrared Remote Home Control:  software Remocon Con for Windows98 able to fire remote control signal through built in infrared port (IrDA) that is of notebook personal computer standard equipment (added 4/02)

Infrared Remote Jammer:  (circuit / schematic design added 6/06)

Infrared Switch:  (schematic / circuit design added 9/02)

Infrared Toy Car Motor Controller:  (electronic Circuit / Schematic added 10/04)

Intelligent Remote Positioner:  Microchip Application Note Published 26-Aug-97   (app note added 2/06)

Interface Control Document for the 13.56 MHz Anti-Collision Interrogator:  Microchip Application Note Published 18-Jul-02   (app note added 6/06)

Interfacing Microchip’s Fan Speed Controllers to a SPI™:  Microchip Application Note Published 12-Nov-02   (app note added 6/06)

Introduction of the DS1847 for Industrial Controls:  Maxim Application Notes / 1909 / Mar-07)  (app note added 6/06)

Inverted Bipolar Transistor Doubles as a Signal Clamp:  06/07)/01 EDN-Design Ideas / (added 7/03) A number of circuits, such as level detectors and AM demodulators, benefit from a rectifier with a low offset voltage. Silicon diodes have an offset of approximately 0.6V and do not work well in low-level circuitry. A Schottky diode is a bit better...

IR Remote Control Extender Circuit (Mark 2):  (electronic circuit added 4/05)

IR Remote Control Extender Circuit (Mark 3):  (electronic circuit added 4/05)

IR Remote Control Extender:  (electronic circuit added 4/05)

IR Remote Control Jammer:  (circuit / schematic design added 10/06)

IR remote control:  (electronic circuit added 2/07)

IR Remote Switch:  (circuit / schematic design added 6/06)

Isolated Driver Forms Solid State Circuit Breaker:  03/03/98 EDN-Design Ideas  / (added 03/03)   -This circuit allows standard TTL logic levels to safely drive a high-power dc load, circuit provides also overcurrent circuit breaker functionality