Technical
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12 Volt Lamp Dimmer
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 timer oscillator. When the wiper of the ...
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Automatic 12 Volt Lamp Fader
This circuit is similar to the “Fading Red Eyes” circuit (in the LED section) used to fade a pair of red LEDs. In this version, the lamps are faded by varying the duty cycle so that higher power incan...
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1.5 Hour Lamp Fader (Sunset Lamp)
Similar to the one above, the sunset lamp comes on at full brightness and then slowly fades out over 1.5 hours time and stays off until power is recycled. ...
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Sunrise Lamp
In this circuit, a 120VAC lamp is slowly illuminated over a approximate 20 minute period. The bridge rectifier supplies 120 DC to the MOSFET and 60 watt lamp. A 6.2K, 5 watt resistor and zener diode i...
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12V to 120V Inverter
Have you ever wanted to run a TV, stereo or other appliance while on the road or camping? Well, this inverter should solve that problem. It takes 12 VDC and steps it up to 120 VAC. The wattage depends...
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Automatic Headlight Brightness Switch
Driving the highway with your high-beam headlights can really increase your visibility, but can be a blinding hazard for other drivers. This simple circuit can be wired into your headlight switch to p...
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Simple Parallel (Printer) Port Interface
This is the basic interface I used as part of my Computerized Room project. This is the parallel interface only. The 8 bit input card can be found, along with the rest of the project, at Computerize Y...
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40W Fluorescent Lamp Inverter
This 40W fluorescent lamp inverter allows you to run 40W fluorescent tubes from any 12V source capable of delivering 3A. Part Total Qty. Description R1 1 180 Ohm 1W Resistor R2 1 47 Ohm 1/4W...
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Fantastic Atom Expander
Here is the schematic, PC board pattern, and parts placement for a “Fantastic Atom Expander”. This circuit produces an “exploding atom” effect using 98 LEDs. Part Total Qty. Description Substi...
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Black Light
This circuit is a simple ultraviolate light that can be powered by a 6 volt battery or power supply (such as the power supply on the “Circuits” page) that is capable of supplying 1 or more amps. ...