I really need your help. I embarked on assembling one of the circuits poste d on the page, specifically the Game Show Who?s First Circuit. I purchase d the parts and put it together to what I understand is correct. Here is wh at I?m seeing.
With a setup of a total of 6 stations, but with only 2 connected for test.
1.The relay clicks to trigger the buzzer.
2.When a button is pushed, it turns on it?s corresponding light.
3.The reset switch works.
4.I added a power switch, which does route power to the circuit or not.
5.Added a fuse to the system before the reset switch.
Problem: When station button is pushed a 2nd can also power it?s light. E ssentially it isn?t locking out the other stations.
I tried checking if maybe the button pushes were too close together in timi ng that it might light both, but with delay in between pushes the test setu p lights either way.
Does it need the minimum 3 stations in order to work properly? I suspect th at it shouldn?t matter how many stations are wired it should still lock t hem out. If you could please give me some guidance it would be greatly appr eciated. I?m kind of stuck and not sure where to proceed.
on the page, specifically the Game Show Who?s First Circuit. I purchased the parts and put it together to what I understand is correct. Here is what I?m seeing.
Essentially it isn?t locking out the other stations.
that it might light both, but with delay in between pushes the test setup lights either way.
it shouldn?t matter how many stations are wired it should still lock them out. If you could please give me some guidance it would be greatly appreciated. I?m kind of stuck and not sure where to proceed.
You are correct that the number of stations is not critical to the operation of this circuit.
Comments:
BE VERY CAREFUL WITH THIS CIRCUIT. There is no isolation between this circuit and the 120 volt main supply. Besides having 120 vac present, the bridge rectifier is also creating 169 volt DC. Debugging this circuit is a real shock hazard.
It would have been nice to have given a link to the circuit instead of forcing people to search for it. You are more likely to get comments if people do not have to guess about which circuit you are actually using.
Debugging:
If I were trying to find a problem in this circuit, this is what I would do:
1) BE CAREFUL. Please note my previous comment about this circuit being a shock hazard.
2) Remove the relay coil and the diode next to it for now. These are simply added complications and can be a problem if either is bad.
3) Recheck all of the wiring connections. (Note: The circuit diagram shows some breaks in a wire in a couple of places where other wires cross. All three of the 2K resistors should have their bottoms connected together.) Also check all of the component values. For instance your circuit has both
51 ohm and 51 kiloohm resistors. Make sure that you are using the correct values.
4) Check that you have 120 vac on the input the bridge.
5) Check that you have about 169 volt DC across the 100 uf capacitor on the left side of the circuit diagram. A 10% variation is expected.
6) With none of the 25 watt lamps lit, check that you have about 3 volts DC across the 1k resistor on the left side of the diagram. (Component labels on the circuit diagram would have been nice. Yes I know that is not your fault.)
7) Press a button to light a lamp. Check that you have about 10 volts DC across the 51 ohm resistor shown next to the relay. Since this voltage is higher than the 3 volts on the 1k resistor, this should keep the other lamps from lighting.
ted on the page, specifically the Game Show Who?s First Circuit. I purcha sed the parts and put it together to what I understand is correct. Here is what I?m seeing.
.
Essentially it isn?t locking out the other stations.
ming that it might light both, but with delay in between pushes the test se tup lights either way.
that it shouldn?t matter how many stations are wired it should still lock them out. If you could please give me some guidance it would be greatly ap preciated. I?m kind of stuck and not sure where to proceed.
So, after carefully reviewing the schematic and my circuit, I found that th e resistor that should link the SCRs was not wired correctly. I suppose lon g nights setting up this system and tending to a 9 month old scrambled my b rain. Thanks to all!!!
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