Hot Swap Controller Handles Dual Polarity - 12/11/03, EDN-Design Ideas:  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.....(design idea added 2/06)

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

How to record telephone conversations - Sometimes it is useful to record telephone conversations. The easiest way is to go to a shop and buy a telephone conversation recording adapter which is connected between telephone line and the tape recorder. Those recording adapters are usually connected between telephone line and the telephone, but there are also other type available....(electronic circuit added 10/05)

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)

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

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

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

Ideal Diode Controller Eliminates Energy Wasting Diodes in Power OR-ing Applications - DN1003  Design Notes (Linear Technology)  (app note added 2/06)

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:  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.....(design idea added 1/05)

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:  (design idea added 6/06)

Infa-Red Remote Control - ….(design added 08/08)

Infra Red Remote Control Extender (Andy Collinson) - This circuit is used to relay signals from an Infra Red remote control in one room to an IR controlled appliance in another room…..(electronic design added 6/07)

Infra Red Switch (Andy Collinson) - This is a single channel (on / off) universal switch that may be used with any Infra Red remote control using 36-38kHz. (This is a very common remote handset frequency). In place of IR1 a TSOP1738 receiver may be used.  (electronic circuit added 7/03)

Infra Remote Control Tester (Andy Colllinson) - (electronic design added 6/07)

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

Infrared gate 2 (Peter Jakab) - This is an infrared gate with two sensors planned to use in the wall in the way behind a door. It can be applied in a toilet to keep track of that someone is inside exceeding a certain amount of time. After that time elapsed, the circuit triggers the digital output wich can turn on a ventillator. The time period ....(electronic circuit added 7/03)

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 (Aaron Cake) - simple circuit which controls one relay output (added 04/03/02)

Infrared Remote Control (randy linscott) - This circuit will allow you to turn on any piece of equipment that operates on 115 volts ac. The receiver circuit is based on the Radio Shack infrared receiver module (MOD), part number 276-137. It is also ….(added 5/02)

Infrared Remote Control (Reynold's Elec) - This article will show you how to use the components in our infrared data communications parts KIT….(circuit / schematic design added 6/06)

Infrared Remote Control Extender (Andy Collinson) - This circuit is used to relay signals from an Infra Red remote control in one room to an IR controlled appliance in another room…. (added 5/02)

Infrared Remote Control of Your PC is Easy! - simple device that connected to the computer serial-port enables the reception of infrared codes emitted from any commercial remote control unit and with a little Windows program the computer learns to recognize sequences and simulates key pressing or executes a program (added 03/03/03)

Infrared Remote Control operates on 115 volts AC - ….(design added 03/08)

Infrared Remote Control Tester (Andy Collinson) - This circuit is the result of my research. I have used a photodiode, SFH2030 as an infra red sensor. A MOSFET opamp, CA3140 is used in the differential mode to amplify the pulses of current from the photodiode. LED1 is an ordinary coloured led which will light when IR radiation is being received. The output of the opamp, pin 6 may be connected to a multimeter set to read DC volts. Infra red remote control strengths …. (added 5/02)

Infrared Remote Control Timer - This infrared remote control timer can be used to turn an appliance on/off for a period of 0.11 second to 110.0 seconds. The circuit comprises two sections, namely, the transmitter section and the receiver section....(electronic Circuit / Schematic added 10/04)

Infrared Remote Controller - The transmitter is built around two CMOS 555 timer ICs (TLC 555s). The transmitter generates a modulated 35-kHz IR signal. The 35-kHz carrier frequency is generated by IC2, and the 1 500-Hz modulating signal is generated by IC1. The output of IC2 drives LED1 through resistor R5; that LED provides...(circuit design added 06/09)

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 (Aaron Cake) - (circuit / schematic design added 04/03/02)

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

Instrument panel lamp dimmer control Circuit - This circuit uses an MC3392 low side protected switch and an MC1455 timing circuit to form an automotive instrumentation panel lamp dimmer control. The brightness of incandescent lamps….(electronic design added 09/08)

Integrator ramps up/down holds output level - 09/27/07, EDN-Design Ideas:  Originally designed for controlling a model train, the integrator ramps up or down at a preset rate in response to changes in the input-dc level and holds at the circuit's input voltage level.....(design idea added 09/08)

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 5/08)

Inverted Bipolar Transistor doubles as a signal clamp - 06/07/01, EDN-Design Ideas:  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.....(design idea added 7/03)

IR Proximity Sensor - It is the same principle in ALL Infra-Red proximity sensors. The basic idea is to send infra red light through IR-LEDs, which is then reflected by any object in front of the sensor. Then all you have to do is to pick-up the reflected IR light. For detecting the reflected IR light, we are going to use a very original technique: we are going to use another IR-LED, to detect the IR light that was emitted from another led of the exact same type! This is an electrical property of Light Emitting Diodes (LEDs) which is the fact that a led Produce a voltage difference across its leads when it is subjected to light. As if it was a photo-cell, but with much lower output current. ….(electronic schematic added 11/08)

IR Remote Control - Volume and mute are provided by this simple but functional circuit. Suitable for all preamps.  (schematic added 6/07)

IR remote control (Aaron Cake) - (electronic circuit added 05/06/07)

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

IR Remote Control Extender Circuit - ….(circuit design added 08/08)

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 Jammer (Aaron Cake) - Don't like your little brother's TV channel selection? Hate the volume your wife sets the stereo at? Want to just annoy someone? This circuit does all that and more by jamming most IR remote signals. The circuit releases a flood of pulsing IR light that confuses the reciever by corrupting the data stream....(added 4/02)

IR Remote Control Tester zen 22142 - (electronic design added 6/07)

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

IR Remote Volume Controller - ….(circuit design added 08/08)

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

Isolated Remote Switch Circuit - There are many applications when a remote switch’s on/off status needs to be monitored. Reed relay sensors, toggle control switches and security alarms contacts are just a few examples.  Routing a switch directly to a computer system hundreds of feet away can often lead to erratic operation and noise problems.  If such a control switch is required, a fully isolated circuit is strongly recommended.  The circuit below provides such isolation.  When properly wired, it will have 5000 volts of isolation and can be positioned 1000 feet away..... ….(designed by David A. Johnson)