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36 Led Flasher Driver Circuit – Circuit Schematic
36 Led Flasher Driver Circuit
Originally intended as a 3-bell animation circuit for Christmas decorations, the circuit can be used for many other purposes that require a flasher of this kin...
Sequential Flasher Circuit – Circuit Schematic
Sequential Flasher Circuit
A 555 timer, IC1, drives a 4017 CMOS decade counter. Each of the 4017s first four outputs drives a CA3079 zero-voltage switch. Pin 9 of the CA3079 is used to i...
3 Channel Color Organ Circuit – Circuit Schematic
3 Channel Color Organ Circuit
The ac line power is brought back into the circuit through Fl, a protective 5-A fuse. One side of the ac line is connected to one side of each ac outlet. The o...
Lamp-Switching Circuit Circuit – Circuit Schematic
Lamp-Switching Circuit Circuit
A normally open pushbutton switch (SI) delivers a positive input pulse to pin 4 of Ul, triggering the 1C into action. The output of Ul at pin 6 supplies base-d...
Strobe Alert System Circuit – Circuit Schematic
Strobe Alert System Circuit
The circuit is activated by an LED/photoresistor isolator (Ul), which is a combination of a light-dependent resistor (LDR) and an LED in a single package. That...
Cold-Cathode Fluorescent-Lamp Supply – Circuit Schematic
Cold-Cathode Fluorescent-Lamp Supply
For back-lit LCD displays, this supply will drive a lamp. LT1072 drives Ql and Q2, and a sine wave app...
Slave Flash Trigger – Circuit Schematic
Slave Flash Trigger
The SCR is wired across the trigger circuit of the flash gun. Normally, the SCR is off, so the flash gun is able to cha...
Light Transmitter – Circuit Schematic
Light Transmitter
This circuit modulates the current through a lamp filament. Use a low-voltage lamp with a thin, straight filament. They h...
Ac Current Indicator – Circuit Schematic
Ac Current Indicator
Using a dual op amp driving a rectifier and emitter-follower, this circuit indicates ac current on an LED. Ll is an au...
Christmas Light Driver – Circuit Schematic
Christmas Light Driver
This circuit will enable a CMOS logic chip, such as a 4017 decode driver, to control a string of Christmas lights or...
"Automatic" Light Bulb Changer – Circuit Schematic
"Automatic" Light Bulb Changer
The circuit presented here guarantees that if bulb Lai "gives up the ghost," bulb La2 will take over its tas...
Light Chaser Ii – Circuit Schematic
Light Chaser Ii
Up to six lights can be sequentially flashed using this circuit. LED1 through LED6 can be replaced by optocouplers (MOC3010...
3-Way Light Control – Circuit Schematic
3-Way Light Control
This hookup is useful in some house wiring situations, where only two wires are available between switches, rather than...
Light Chaser I – Circuit Schematic
Light Chaser I
Up to 100 lights, LEDs, or optocoupler triac circuits can be sequentially activated by this circuit. One (Ul) 4017 decode co...
Automatic Emergency Lighting Unit – Circuit Schematic
Automatic Emergency Lighting Unit
This unit uses a Nicad battery to provide power to an emergency lighting setup. When power fails, T1 beco...
Light Dimmer – Circuit Schematic
Light Dimmer
Lamp II is a household lamp. When the switch is in the center position, the lamp is operated on half-wave rectified ac; the ef...
Four-Quadrant Dimmer – Circuit Schematic
Four-Quadrant Dimmer
This very special mains-operated dimmer for domestic or industrial lights is not available in proprietary form: it ena...
Light Dimmer/Speed Control – Circuit Schematic
Light Dimmer/Speed Control
A phase-controlled triac (HT-32) circuit provides control of effective voltage at load. Do not omit LI and C4 be...
Three-Way Touch Lamp – Circuit Schematic
Three-Way Touch Lamp
A three-way switch to control a lamp (off-dim-bright, etc.) uses an NE555 timer to generate a one-second pulse, trigge...
Ac Circuit Led Power Indicator – Circuit Schematic
Ac Circuit Led Power Indicator
Many electronic circuits need an indication that they are under power; for most ac circuits, a neon lamp is ...