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canigian1

Building a DIY Chasing Circuit

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I've read several threads and have successfully created my own chasing light sets from the cheapie chaser lights in the store, but they all only yield 3 channels. There has to be a way to build a chasing circuit using CMOS counters, NAND gates, resistors, etc, etc that can go up to chasing 10 circuits. Anyone know how to do it? Any help would be greatly appreciated.

Thanks!

- Adam

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Hey Adam,

If I was going to do that, I would simply make a 10 bit shift register and use open collector drivers to drive "hockey puck" SSRs. The ring counter can be clocked with any astable multivibrator. Then connect all of your strings to the outputs of the SSRs. But, I would stay away from CMOS...too static sensitive. Using TTL would be fine. Let me know if you need more help building this. I don't have time to draw it up, but I think I could find some references for you.

Do you have any electronic background?

Good Luck!!

Dennis

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Hi Dennis, Thanks for the reply! Unfortunately, I know just enough to be dangerous with this electronics. It's easy enough to look at the premade products and figure out how they work, but creating circuits like this is a bit beyond me. Would the SSR's be more costly to implement than the CMOS? also, as far as the astable, and other parts, I think I would be able to get by with a parts list and a rough diagram. Maybe we can chat offline? I'd love to expand my knowledge of this stuff. Thanks Dennis!

- Adam

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Hi Adam,

I don't know of any CMOS circuits that can switch 115 volts! The circiuts you see in those chaser strings are usually a hybrid circuit custom made for mass production. That was why I suggested using SSRs. They are a really easy way to switch 115 volts AC with a low-level logic signal.

Let me see what I can work up for you.

Dennis

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If you're looking for a project, then by all means go for it. However, by the time you buy all the SSR's and possibly have a small circuit board made, you probably could have just bought an 8 or 16 channel LOR and dedicated it for chase lights. My driveway exit path is exactly that.

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