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. . .  [Matthew Hewson's circuit]

TRIAC Light Dimmer -  Schematic only, no circuit description. . . 

TRIAC Light Dimmer -  This little circuit can be used to dim lights up to about350-Watts. It uses a simple, standard TRIAC circuit that, in my experience, generates very little heat. Please note that this circuit cannot be used with fluorescent lights. . . 

Triac lighting and heating controller uses feW parts -  09/02/04  EDN Design Idea   The triac lighting-control circuit in Figure 1 is small and inexpensive because load and housekeeping power come directly from the line voltage, thereby eliminating bulky, expensive supplies. The CLZD010 closed-loop controller. . .  [by David Caldwell, Flextek Electronics, Carlsbad, CA]

Turn on the aquarium lights every day at the same time -  Turn on the sprinkler or the aquarium lighting for the same period of the day. You can choose to operate the output by every 2nd, 3rd day only. There is a manual start/stop button to immediately turn on or off the output, and a disable button to completely turn off automatic operation. . .  [Peter Jakab, Electrical Engineer, Engineer of Informatics]

Turnout Anti-Derail Protection  -  switch machine control circuit for model trains. . .  [Designed by Rob Paisley]

Twin Coil Switch Machine-Automatic Reversing Loop Circuits  -  switch machine control circuit for model trains. . .  [Designed by Rob Paisley]

Two button control -  Two button control systems are used on dangerous industrial machines in order to protect the operator’s hands. Just for hobby I made a circuit that turns on a relay by pressing two buttons simultaneously. . . .  [Andrea, I live in Central Italy]

Two buttons provide safe start -  07/06/00 EDN Design Idea   The circuit in Figure 1 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 switch. . .  [by Vincent Himpe, Alcatel Microelectronics, Desselgem, BelgiumVincent Himpe, Alcatel Microelectronics, Desselgem, Belgium]

Two Light Controlled Relays -  These two circuits use LDRs (Light Dependent Resistors). Circuit No. 1 energizes the relay when the light rises above a preset level. Use it to switch things on at dawn. Circuit No. 2 energizes the relay when the light falls below a preset level. Use it to switch things on at dusk. . . .  [Ron J.'s circuit]

Two Line Intercom Plus a Telephone Changeover Switch -  The circuit presented here can be used for connecting two telephones in parallel and also as a 2-line intercom. Usually a single telephone is connected to a telephone line. If another telephone is required at some distance, a parallel line is taken for connecting the other telephone. In this simple parallel line operation, the main problem is loss. . . 

Two Temperature Controlled Relays -  These two circuits use Thermistors (Temperature Dependent Resistors). Circuit No. 1 energizes the relay when the temperature rises above a preset level. Use it to switch things on when it gets hot. Circuit No. 2 energizes the relay when the temperature falls below a preset level. Use it to switch things on when it gets cold. . . .  [Electronic design by Ron J.]

Two wire 4 by 4 key keyboard interface saves power -  08/17/06 EDN Design Idea   Resistor matrix and microcontroller encode keypad - You can use a microcontroller that includes an ADC to design a two-wire-plus-ground keyboard interface. For example, you can use a resistive voltage divider to identify a. . .  [by Stefano Salvatori, University of Rome, Rome, Italy, and Gabriele Di Nucci, EngSistemi, Rome, Italy]

Two-wire, four-by-four-key keyboard interface saves  -  08/17/06 EDN Design Idea   You can use a microcontroller that includes an ADC to design a two-wire-plus ground keyboard interface. For example, you can use a resistive voltage divider to identify a pressed key (Reference 1). A microcontroller€™s integrated . . .  [by Stefano Salvatori, University of Rome, Rome, Italy, and Gabriele Di Nucci, EngSistemi, Rome, Italy]

Typical Application for the UPG2150T5L Switch  -  Application Note  Doc #962. . .  [California Eastern Laboratories]

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