7400 competition entry: A nixie-based Press Your Luck game

It’s time to Press Your Luck! Check out Christopher’s nixie-based Press Your Luck game for the Open 7400 Logic Competition :

Press Your Luck (tv game show) in Nixie form, getting a W (view the tube upsidedown) is like getting a Whammy. See how many points (other cathodes) you can get before hitting 3 whammies.
People on the show would always say “NOWHAMMY NOWHAMMY NOWHAMMY STOPPP!!!”

Build something that uses or abuses a logic chip and get amazing boards, tools, and other swag. The Open 7400 Logic Competition promotes awareness of the basic building blocks of modern circuits. Devious geeks ignited the computer revolution with discrete logic computers, what can you do? Details and entry form here.

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  1. Jeez! It is not a good idea to stop the clock the way you are doing there. The 555 has a totem-pole output, so it can both source and sink current. Tieing ping 3 directly to VCC as you are doing can easily damage the chip. It would be better, for example, to have pin 4 connected to GND instead. Also, if the values on your schematic are correct, 10Ohm is a very low resistance value to use as pulldown…

  2. ah hmm yeah, didn’t think of that (i’m not an electrical engineer)

    maybe a diode after pin 3 would work better? i’m not so concerned with breaking the 555 as i would be the 74192

    couldn’t think of a different way to stop the clock

    the pull down resistor is 50ohm, i used that i think because that’s what the datasheet suggested

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