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Need help designing a light bulb blinker

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Old 09-21-03, 10:19 PM Thread Starter   #1
Crazy Jayhawk

 
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Need help designing a light bulb blinker


I'm trying to build something that will turn a lightbulb on and off at a regular pace. Basically, it'll have a red bulb and a blue bulb and it'll switch back and forth between them. I'm trying to design something that makes it look like there's a cop car outside the window (it's a decoration for Casino Night at my dorm).

Is there an easy way to build one of these things? Also, I want to use 120V lightbulbs instead of LEDs. This thing needs to be fairly bright.

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Old 09-23-03, 11:46 AM   #2
JimmyG
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You would need to use a timing IC to set up the time cycle and then drive a relay with that timing IC. You can go to Radioshack and look at some of their electronic projects and probably find exactly what you are looking for. If you can't find one, PM me and I can probably gin up a diagram to use. Are you handy with a soldering iron?

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Old 09-23-03, 05:16 PM   #3
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Would this post not belong in Alt - modding?
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Old 09-24-03, 05:56 AM   #4
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I think you want an astable multivibrator driving two relays or solid state switches. Two transistors, 4 caps, 4 resistors, a couple of trim pots and the relays, that simple enough?

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Old 09-24-03, 07:47 AM   #5
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Aha, this is what I was thinking of....
http://www.uoguelph.ca/~antoon/circ/flash2.htm
Just take out R1 and R4 and the LEDs and replace them with 100 Ohm resistors and 6V relays, with a diode (1n4001) wired across the coil to stop back EMF. Then wire the lights through the relay contacts. You can replace R2 and R3 with 50K trim pots to vary the timing at will. I think RadioShack keeps 2N2222s though they are pretty easy to salvage from used equipment.

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