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12 Stage Neon Sequencer NE 2/NE 51 - 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 going for a
couple weeks. High voltage (70 volts) for the neon lamps is obtained from
a small switching power supply using a 74HC14 Schmitt trigger squarewave
oscillator, high voltage switching transistor..... [Bill Bowden's circuit] |
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12 Volt DC Fluorescent Lamp Driver (Aaron Cake) - This
fluorescent lamp driver uses a normal 120 to 6V step-down transformer in
reverse to step12V to about350-Volt to drive a lamp without need to
warm filaments. (added 04/03/02) |
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12 Volt fluorescent lamp drivers - Three schematics of 12 V
drivers for 2, 8 and 20 Watt, plus a lot of explanations about fluorescent
tubes. Use the drivers for camping, emergency, boating, etc. [Manfred
Mornhinweg] |
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12 Volt Lamp Dimmer (using a pot) - 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
potentiometer is at the uppermost position, the capacitor will charge quickly through
both 1K resistor.....(added 05/09) Bill Bowden's website] |
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12 Volt Lamp Fader (LEDs or incandescent) - 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
incandescent lamps can be used without much power loss. The switching waveform is
generated by comparing two linear ramps.....(electronic schematic / circuit added
05/09) |
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12
Volt Strobe Circuit - this circuit uses 12V DC instead of mains AC.
This is very good idea if you don't want to mess with direct mains voltage connected
circuit or you want to run stroboscope from batteries. (added 4/02) |
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120 VAC Lamp Chaser using Solid State Relays - 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 diagram is a Radio Shack 3 amp unit (part
no. 275-310) that requires 1.2 volts DC to activate. No current spec was given but I
assume it needs just a few.....(electronic circuit added 7/03) |
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120 VAC Lamp Dimmer - 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 provide a full wave rectified voltage to the anode of a SCR. Two small
signal transistors are connected in a switch configuration so that when the voltage on
the 2.2uF..... |
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120 Volt AC Lamp Chaser using Solid State Relays - This circuit is similar
to LED clock using12 neon indicator lamps instead of LEDs. It operates from2
high capacity ni-cad cells (2.5 volts) which keep it going for a couple weeks. High
voltage (70 volts) for neon lamps is obtained from a small.....(added 4/02)
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120 Volt AC Lamp Dimmer Full Wave SCR - ..... |
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120VAC Lamp Chaser Using Solid State Relays - Uses Solid State Relays
(electronic circuit added 4/05) |
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12v car lamp flasher - Schematic only, no circuit description |
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12V DC Fluorescent Lamp Driver (Aaron Cake) - (electronic circuit added
4/05) |
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12v Fluorescent Inverter - This is a low-cost project for 20 or 40 watt
fluorescent tubes. However the most efficient is to use a 40 watt tube (or two 20 watt
tubes in series). It's a circuit you can put together from junk box components or
build from a kit. It's very simple to build and requires no printed circuit
board.....(project added 04/09) |
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12v Light/Dark Lamp Switch - At night, this circuit will route current to a
12v lamp, turning it on. (added 7/06) …. [Designed by David A. Johnson] |
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12v Light/Dark Switch - Often, for certain low voltage lighting systems; you
would like to turn off the lights during the bright light of the day. Most
commercial day/night switches are designed for AC lighting. The circuit below
was designed for a 12v DC system. But, it could be modified for other voltage as
well. It uses an inexpensive phototransistor as the light detector. An
n-channel FET is used to switch power to the lights. A transistor circuit is
included to provide some hysteresis. This keeps the circuit from fluttering the light
during the transition from day to night and night to day. It is recommended that
a plastic tube be placed over the transistor to prevent it from being illuminated by
the lights it is controlling. By selecting the appropriate power FET, the
circuit could control over 100 watts worth of 12v lighting. (July 27, 2008) ….
[Designed by David A. Johnson] |
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12V PWM Motor/Light Controller - The diagrams are for 12V operation only and
there are high side (common ground) and low side (common +12V) versions. The low side
version of the circuit uses an N Channel FET, the high side version of the circuit
uses a P Channel FET. N Channel devices tend to handle more current than P Channel
devices, they are also less expensive. The high side version of the circuit is useful
when one side of the load has to be grounded..... [G. Forrest Cook] |
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12VDC Fluorescent Lamp Driver - A number of people have been unable to find
the transformer needed for the Black Light project, so I looked around to see if I
could find a fluorescent lamp driver that does not require any special components. I
finally found one in Electronics Now.....(electronic design added 6/07) |
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