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Fading LEDs schematic – Circuit Schematic
Fading LEDs schematic
This circuit is used to slowly illuminate and fade a pair of red LEDs (light emitting diodes). The fading LEDs could be installed as 'eyes' in a small pumpkin o...
1.5 volt LED flasher schematic – Circuit Schematic
1.5 volt LED flasher schematic
This 1.5 volt led fasher runs more than a year on a single 'd" cell and alternately flashes 2 LEDs at about a 1 second rate. The circuit employs a 74HC14 CMOS h...
12 Neon Lamps Sequencer circuit – Circuit Schematic
12 Neon Lamps Sequencer circuit
This circuit is similar to the LED clock using 12 neon indicator lamps instead of LEDs. It operates from 2 high capacity ni-cad cells (2.5 volts) which keep it ...
Neon Lamp Flashing Schematic – Circuit Schematic
Neon Lamp Flashing Schematic
In this circuit, one, two or three neon indicator bulbs can be made to flash in sequence at rates determined by the R and C values. In the single stage circuit,...
Racing Finish Line Lamps circuit – Circuit Schematic
Racing Finish Line Lamps circuit
The finish line circuit below detects the first of three cars to cross the line and illuminates a 25 watt 120 VAC lamp indicating the winning lane. Three photo ...
AC Lamp Chaser schematic – Circuit Schematic
AC Lamp Chaser schematic
This circuit is basically the same as the 10 channel LED sequencer with the addition of solid state relays to control the AC lamps. The relay shown in the diagr...
25 LED Sequencer schematic – Circuit Schematic
25 LED Sequencer schematic
This circuit is same as the above setup to drive 25 small Xmas lights. The lights operate at about 200mA and 3 volts. The supply voltage is set to 5 volts and t...
28 LED Clock schematic – Circuit Schematic
28 LED Clock schematic
In the circuit below, 60 individual LEDs are used to indicate the minutes of a clock and 12 LEDs indicate hours. The power supply and time base circuitry is the...
Lamp Dimmer schematic – Circuit Schematic
Lamp Dimmer schematic
The full wave phase control circuit below was found in a RCA power circuits book from 1969. The load is placed in series with the AC line and the four diodes pr...
AC lamp Dimmer Schematic – Circuit Schematic
AC lamp Dimmer Schematic
The circuit is directly connected to the AC power line and should be placed inside an enclosure that will prevent direct contact with any of the components. To ...
Touch switching 12V Light – Circuit Schematic
Touch switching 12V Light
The circuit on the right uses three bipolar transistors to accomplish the same result with the touch contact referenced to the negative or ground end of the sup...
12 Volt Lamp Dimmer schematic – Circuit Schematic
12 Volt Lamp Dimmer schematic
Here is a 12 volt / 2 amp lamp dimmer that can be used to dim a standard 25 watt automobile brake or backup bulb by controlling the duty cycle of a astable 555 ...
LED Traffic Lights for Games with 555 – Circuit Schematic
LED Traffic Lights for Games with 555
The LED traffic Light circuit controls 6 LEDs (red, yellow and green) for both north/south directions and east/west directions. The timing sequence is generated...
Schmitt Trigger Photo switch – Circuit Schematic
Schmitt Trigger Photo switch
This is basically a Schmitt Trigger circuit which receives input from a cadmium sulfide photo cell and controls a relay that can be used to switch off and on a ...
Power LEDs from Mains – Circuit Schematic
Power LEDs from Mains
The circuit below illustrates powering a LED (or two) from the 120 volt AC line using a capacitor to drop the voltage and a small resistor to limit the inrush c...
25 white LED Driver – Circuit Schematic
25 white LED Driver
The LED circuit below is an example of using 25 white LEDs in series connected to the 120VAC line. It can be modified for more or less LEDs by adjusting the res...
1 Cell battery LED flasher circuits – Circuit Schematic
1 Cell battery LED flasher circuits
The LED flasher circuits below operate on a single 1.5 volt battery. The circuit on the upper right uses the popular LM3909 LED flasher IC and requires only a t...
555 LED flasher II – Circuit Schematic
555 LED flasher II
The 555 circuit below is a flashing bicycle light powered with three C or D cells (4.5 volts). The two flashlight lamps will alternately flash at a approximate ...
Flashing LEDs toy with 555 – Circuit Schematic
Flashing LEDs toy with 555
There have described the involvement benefited LM3909 circuit, which is quite expensive. That's why I prefer to use a much cheaper known timer 555th.Involvement...
Energy Saving Night Light circuit – Circuit Schematic
Energy Saving Night Light circuit
The lamps are usually used as ballast or electronic ballast inverter. Here it is used to reduce voltage capacitor reactance. Interesting is also the method of ...