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Trying to identify/locate ICs

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I sifted through those addresses, and came across a link to http://www.mikesusan.com/lasertag.html, which may be what I'm looking for. It's compact, doesn't necessarily have to work with commercial sets, and I can run it off a 9V battery.

The emitter is pretty straightforward (), as is the sensor (). A question remains (as I can't seem to find an email address on the author). Do you think I could attach multiple IR Receiver modules to the 567 in the sensor, instead of multiple 567 outputs to the 555 timer?

Also, I think the 161 chip is a 74x161 counter (say, DigiKey part #296-2096-5-ND), but could someone more knowledgable than this humble llama confirm that?

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