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  #1  
Old 04-02-2011, 11:14 AM
QuangVuong QuangVuong is offline
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Default Game Buzzer Circuit

Hi
I'm kinda new to making circuits. I have a monostable 555 timer circuit which I need to integrate with another one. So if S1(PTM) is pressed thelight will stay on for about 5 seconds and the other switch cannot be used when the other switch is on. Vice versa.

So I have drawn up a circuit in Yenka, and everything works. Except the light stays on forever. I tried increasing the resistance and lowering the capacitance but the light will not turn off after a few seconds. Would anyone have an idea? To turn the light off after a few seconds. If anyone wants to have a look at the circuit, I'll upload it.

Its the bottom circuit.
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File Type: zip Game Show Circuit.zip (18.0 KB, 49 views)

Last edited by QuangVuong; 04-02-2011 at 11:23 AM.
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Old 04-02-2011, 11:16 AM
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Bill_Marsden Bill_Marsden is offline
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Schematic please. Schematics tell much more than words.

Have you thought of using the output of each 555 to feed the reset line of the others?
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Old 04-02-2011, 11:23 AM
QuangVuong QuangVuong is offline
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Uploaded first post.
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Old 04-02-2011, 12:00 PM
KMoffett KMoffett is offline
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Never seen YENKA. Please post your image in a .png, .jpg, .gif, .pdf, or .doc file format so we can see it.

Ken
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Last edited by KMoffett; 04-02-2011 at 01:21 PM.
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Old 04-02-2011, 12:48 PM
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I was about to make the same comment. I haven't even heard of it, which is unusual. The best graphic format is .png, or .gif .
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Old 04-02-2011, 10:10 PM
QuangVuong QuangVuong is offline
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Yenka is a program which helps us draw up circuit diagrams and test them. It's a free program.

Anyway, I'll take a screenshot and upload it here.
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Old 04-03-2011, 01:34 AM
QuangVuong QuangVuong is offline
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Old 04-03-2011, 02:46 AM
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Try this, it is what I suggested earlier...

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File Type: gif temp4.GIF (21.5 KB, 60 views)
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Old 04-03-2011, 02:52 AM
QuangVuong QuangVuong is offline
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Which inverter should I be using? 324op amp or 741 op amp?

I need to use the basic monostable design to make a buzzer system, where a light turns on when one of the PTM switches are pressed. The light will turn off shortly. Anyone can press their switch, but only one light can stay on at a time. There will only be two switches.

Im also thinking of using a thyristor, but then I need to find a way to connect the monostable circuit to a thyristor and then have two connected together. I can do it with a LED, but am having trouble with connecting the monostable circuit to the thyristor. Does anyone have an idea?

Or how to just make a circuit which works like game shows on TV, but it has to use a monostable design?

Last edited by QuangVuong; 04-03-2011 at 03:11 AM.
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Old 04-04-2011, 07:22 PM
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How about a CMOS (digital logic) inverter? You can also use 2 resistors and a transistor to make a single inverter (any general purpose NPN and two 10KΩ resistors).

You didn't name inverters, you named op amps.

Classic CMOS Hex inverters (6 in a package) would include a 4049, 4069, 40098, 40106. TTL is limited in voltage but examples would be the 7404, 7414.

A good chip reference (there are many) is Sams Electronics Circuits (no relation to Sams).

http://users.otenet.gr/~athsam/database.htm

With any chip, be it digital or analog, ground the inputs to unused gates or op amps.
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