TB056: Demonstrating the *set_report* Request: With PS/2® to USB Keyboard Translator Example:  Microchip Application Note - Published 4-May-04   (app note added 2/06)

Test System Signal Switching:  Agilent Application Note   (added 6/06)

The Behavior of CMOS in hot insertion:  Pericom Semiconductor Application Brief # 039 (app note added 02/05)

Thermal Switches provide circuit disconnect:  09/04/03 EDN Design Ideas  /  (added 1/05)  A single temperature sensor can provide an interrupt to a microcontroller when the measured temperature goes out of range. You need multiple temperature sensors when you have to monitor more than one hot spot. A microcontroller implements the proper protective action when one of the temperature monitors detects an overtemperature condition....

Three parts provide tenfold increase in Switcher Current:  08/22/02 EDN Design Ideas  /  (added 1/05)  Industrial-control circuits often derive their power from widely varying sources that can exceed the 40V maximum rating of popular switching ICs. This Design Idea presents a simple, flexible, and inexpensive buck switcher that converts an input voltage as high as 60V to 5V at several amps. The circuit is unique in that it boosts current with almost no compromise in performance, size, or cost....

Throughput Expansion with FET Based Crossbar Switching:  Pericom Semiconductor Application Note # 045 (app note added 02/05)

Tiny RGB Video Multiplexer Switches Pixels at 100MHz:  DN205 -  Design Notes (Linear Technology) (app note added 6/06)

Toggle Switch Control of Twin Coil Switch Machines:  (circuit / schematic design added 6/06)

Touch Activated Alarm:  (electronic (schematic / circuit added 4/02)

Touch Dimmer:  (electronic Circuit / Schematic added 10/04)

Touch Switch #3:  A touch switch is a switch that is turned on and off by touching a wire contact, instead of flicking a lever like a regular switch. Touch switches have no mechanical parts to wear out, so they last a lot longer than regular switches. Touch switches can be used in places where regular switches would not last, such as wet or very dusty areas. (electronic (schematic / circuit added 4/02)

Touch Switch #3:  A touch switch is a switch that is turned on and off by touching a wire contact, instead of flicking a lever like a regular switch. Touch switches have no mechanical parts to wear out, so they last a lot longer than regular switches. Touch switches can be used in places where regular switches would not last, such as wet or very dusty areas. (circuit / schematic design added 10/06)

Touch switch needs no dc return path:  02/03/05 EDN Design Ideas  / (added 5/05)  Common designs for touch switches detect a decrease in resistance when a user's fingertip either connects a contact to the circuit's common ground or supplies an injection of 60-Hz ac voltage, resulting from immersion in the electrostatic field that nearby power lines radiate. But what if no nearby power lines exist and the equipment operates from a battery source, such as in an automotive appl...

Touch Switch using Transistors:  (circuit added 9/04)

Touch Switches:  (electronic circuit added 1/03)

Transformer Driver Controlsbidirectional Switch:  07/17/97 EDN-Design Ideas / (added 6/06)   -- You can use a transformer-driver IC to simply control a MOSFET on/off switch

Translating DVD Video (with Pericom's PI5C3245 and PI5C16212 Bus Switches):  Pericom Semiconductor Application Brief # 012 (app note added 02/05)

TRIAC Light Controller #2:  (circuit / design added 8/03)

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 Buttons provide safe start:  07/06/00 EDN-Design Ideas / (added 8/03) - Provides a safety interlock that checks the actuation of two pushbuttons before enabling a relay. When you push both buttons, the circuit actuates the relay. At that point, you can release one of the switches without the relays switching off. The circuit was intended to lock out the engine of an underwater propulsion unit.

Two Line Intercom Plus a Telephone Changeover Switch:  The circuit presented here can be used for connecting two telephones in parallel and also as a2-line intercom. FAIR WARNING -- THIS SITE HAS ANNOYING POP UP ADS. (added 5/02)

Typical Application For The UPG2150T5L Switch :  Application Note - California Eastern Laboratories - Doc #962  (app note added 6/06)

Ultra Low Voltage N-Channel Analog Switch (Transmission Gate):  Circuit Ideas for Designers - Application Notes - Advanced Linear Devices, Inc.  (app note added 6/06)

Ultrasonic Switch #2:  (circuit / schematic added 6/05)

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 any other remote control system this cirucit too comprises a mini transmitter and a receiver circuit. Transmitter generates ultrasonic sound and the receiver senses ultrasonic sound from the transmitter and switches on a relay. The ultrasonic transmitter uses a 555 based astable multivibrator. It oscillates at a frequency of 40-50 kHz. An ultrasonic transmitter transducer is used here to transmit ultrasonic sound very effectively. The transmitter is powered from a 9-volt PP3 single cell. The ultrasonic receiver circuit uses an ultrasonic receiver transducer to sense ultrasonic signals. It also uses a two-stage amplifier, a rectifier stage, and an operational amplifier in inverting mode. Output of op-amp is connected to a relay through a complimentary relay driver stage. A 9-volt battery eliminator can be used for ….  (added 10/05)

Undershoot Protection When using Bus Switches:  Pericom Semiconductor Application Note # 030 (app note added 02/05)

Universal Telephone Hold:  (circuit / schematic design added 6/06)

Using model PSW-1211 as a SPST switch  AN-80-001:  Application Note - MiniCircuits.com  (app note added 6/06)

Using the RSW-2-25P switch  AN-80-004:  Application Note - MiniCircuits.com  (app note added 6/06)

Video Routers:  VISW 8 x4 Stereo audio/video router (added 5/02)

Voice over Circuit:  switches automatically from sound source to microph1-when enough sound comes in from microph1- (added 5/02)

Voltage Comparator Switch:  (electronic (schematic / circuit added 4/02)

Voltage-Based Controller for Switches:  (circuit / schematic design added 6/06)

VXI Switching Application Note (5968-7234):  Aligent Application Note  (added 2/06)

Water Activated Relay:  (electronic (schematic / circuit added 4/02)

Whistle on Whistle Off:  This CMOS toggle flip flop circuit has an addition of two bandpass filters and condenser microph1-so the relay can be toggled by whistling at it. (added 5/02)

Whistle Responder:  Beeps when hears your whistle A gadget suitable for key-holders, games etc. (added 9/04)

White LED Driver Backlights LCD and keypad:  11/13/03 EDN Design Ideas  /  (added 1/05)  Designers widely use white LEDs to backlight color LCDs and keypads in handheld devices, such as cell phones, MP3 players, GPS navigators, and PDAs. Their spectrum and brightness represent near-ideal light sources. One possible configuration for a phone or a phone/PDA combination is to have a group of three LEDs to light the display and six LEDs for the

XY Keypad uses µC's Serial Port:  10/10/96 EDN-Design Ideas / (added 3/03)  

Zero-Delay Bus Switches:  Pericom Semiconductor Application Note # 001 (app note added 02/05)