TB094: Dimming AC Incandescent Lamps using a PIC10f200:  Microchip Application Note Published 22-Nov-05   (app note added 2/06)

Telephone Controlled Night Light:  When the telephone rings, or when the handset is lifted, the night light is turned on and remains on while the conversation takes place. When the handset is replaced in the cradle, the light remains on for about11 s. During standby conditions, the -28Vdc bias on the phone line maintains the output of U3 in a high state. When the ac ring signal is applied to the phone line, it is processed by the ring detector U1, producing a negative output pulse at pin2 for each ring. These pulses trigger U2, causing its output to become high and the discharge transistor to turn off. (added 3/03)

Tester Checks Christmas Tree Lights:  12/16/04 EDN on Components (added 1/05) 1Why is it that you always test 48 bulbs before you find the bad one in a 50-light string? This simple circuit allows you to divide and conquer, greatly reducing the time it takes to find the bad bulb.

Third Brake Light Pulser:  (schematic / circuit added 10/02)

Three Way Touch Lamp:  A three-way switch to control a lamp (off-dim-bright, etc.) uses an NE555 Timer to generate a1-second pulse, triggered by ambient ac fields that are picked up by the human body. Read also the circuit description. (added 6/06)

Timer Exploits Opamp Bias Current:  07)/21/94 EDN-Design Ideas / (added 5/03) The simple, low-cost analog timer in Fig 1 exploits the parasitic input-bias current of op-amp IC1. The timer achieves long time delays even though it uses only low-value, inexpensive ceramic chip capacitors. After all, because the input-bias current is the minimum current flow into an op amp, this method produces the longest time delays possible from a given capacitor and op amp....  

Touch Activated Lamp (ourworld):  (electronic circuit added 7/03)

Touch Activated Light (circuitsdb):  The circuits above light a 20 watt lamp when the contacts are touched and the skin resistance is about 2 Megs or less. The circuit on the left uses a power MOSFET which turns on when the voltage.... (added 2/07)

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 4/02)

Traffic Light Controller #2:  controls on3 LED traffic light sequence (added 4/02)

TRIAC Light Controller #4:  (electronic 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)

TRIAC Light Dimmer #2:  (electronic design added 9/02)

TRIAC Light Dimmer #3:  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. (added 4/02)

TRIAC Light Dimmer:  dim115-Volt lights up to about350-Watt (added 5/02)

TRIAC Lighting and Heating Controller uses Few Parts:  09/02/04 EDN Design Ideas  / (added 1/055)  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 maintains constant light intensity by automatically adjusting the timing of the triac's firing until the feedback signal and setpoint command are equal.

Trigger Circuit for Strobes:  circuits which can be used for triggering stroboscopes from external signals (added 4/02)

Two Transistor LED Flasher #2:  (electronic design added 9/02)

Two Wire DC Lamp Dimmer Replaces Rheostats:  10/23/97 EDN-Design Ideas / (added 3/03) Originally for use in commercial trucks, a low-cost dc lamp dimmer (Figure 1) can control more than 100W of incandescent panel lighting and replaces a high-power rheostat, whose heating darkens the instrument panel. The circuit has several unique advantages: A two-wire connection means no change to existing wire harnesses, high efficiency means minimal heat sinking, and a typical circuit costs less than the rheostat it replaces....

Two Wire Lamp Flasher:  Ideal to operate3 to24 Volt DC existing on-Circuit lamps LED operation is also possible (added 6/06)

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 11/06)

Typical 120 Volt AC Dimmer Circuit:  This is the type of common light dimmer widely available at hardware stores and home centers. The circuit is a basic model for light dimmer for120V AC voltages. This basic design can handle light bulbs at power range of around30W to few hundred watts (depends on construction). (added 2/03)

Typical Strobe Light Trigger Circuit:  555 based Timing circuit which triggers a SCR which controls the trigger transformer (added 4/02)

Ultra-Bright LED Lamp:  (electronic Circuit / Schematic added 10/04)

Universal Input Linear Fluorescent Ballast using the Ir2166:  The IR2166 Demo Board is a high efficiency, high power factor, fixed output electronic ballast designed for driving rapid start fluorescent lamp types. The design contains an EMI filter, active power factor correction and a ballast control circuit using the IR2166.  (added 3/05)

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

Using the LM555 Timer with Photocell Detectors:  (electronic circuit added 7/03)

UV Light Box:  (electronic circuit added 4/05)