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Author Topic: 2 input to 1 output circuit  (Read 1448 times)

cw4

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2 input to 1 output circuit
« on: April 02, 2009, 10:27:10 PM »
I have a circuit that has 5v on a N.C. microswitch.  when a coin is dropped it breaks the 5v and activates the device.  I need it to not activate til 2 coins are dropped.  Any suggest for a cheap was to do this would be greatly appreciated....thanks...bill
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Florida Tony

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Re: 2 input to 1 output circuit
« Reply #1 on: July 22, 2009, 11:45:46 PM »
There is probably something simpler out there but a PIC Microcontroller would do the job. Maybe some sort of And Gate setup if you have two slots for coins. Just Ideas. The Microcontroller is pretty versatile. The and gate is pretty simple.
« Last Edit: July 22, 2009, 11:52:55 PM by Florida Tony »
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Zapitgood

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Re: 2 input to 1 output circuit
« Reply #2 on: October 15, 2009, 02:52:09 PM »
There are many digital counter/decade chips. The http://www.fairchildsemi.com/pf/74/74F191.html is pretty simple to use.  The coin drop pulses the counter (clock) and you can set the chip to reset after a determined count.

Much more simple than a PIC and maybe even overkill by itself. I'm sure a simple transistor logic method could do the trick but it's not my area.
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