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Wiring Coin Controls coin door counter **wiring diagram added**

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bfauska:

So:

If the counter were the only thing being triggered, the coin switch would be normally open, and part of the ground side of the counter circuit, when the switch closes it makes a full circuit with for the counter.  If I were to use my counter and the coin in terminal on an encoder with the the coin switch how would I wire it?  It seems like I could either use a 2 pole switch or add a relay.  Could I wire the common on the coin switch to the ground and the normally open on the switch to both the counter and the encoder?  I imagine I would need a diode on the encoder side so that I wasn't allowing the voltage to go into it.  I am not quite sure of this technique, the ground would also have to be the same, which I would expect the ground of the encoder to be the same as the PC power supply ground, if the counter is 5v then I suppose I could even run it from the encoder 5v post.

Does this all sound way off base, or am I on the right track?  I know that there isn't much point to using the counter with an emulator machine, but it seems like it may be fun to know how many coins I actually use in the machine.  I suppose I would have to wire it separate from any credit buttons if I want a true count of coins.

Thanks for any help, I hope I don't sound dumb about this.

Ken Layton:

Randy Fromm has an excellent write-up on connecting coin counting meters on his tech website. It's called, "Meter Methods", but it's recently been moved to the pay section of his site.

SavannahLion:


--- Quote from: mountain on April 16, 2007, 02:15:29 pm ---Spikes are basically the release of stored magnetic energy from a coil caused by fluctuating current levels. These can generally create problems with sensitive electronics, noise in audio circuits (pops, static), and noise in video circuits.

In the Aviation industry, all relays are to be equiped with a diode across the coil.

--- End quote ---

I think I understand. The diode acts as a drain for the excess current. I looked up a schematic example of a diode across a coil and the circuit was on the ground side of the coil. The way it was explained was that as the coil switches to an "off" state, there's excess current that tries to run through the coil but has no where to go. That's what the diode is for. I think I understand why a cap isn't used because you don't want the excess potential just sitting there. Another schematic used the diode to prevent arching. Essentially, the same function, draining excess current and supressing spikes to less than 1V.

Is that correct?

The cool thing is while I was figuring this out, I came across an explanation for a confusing diode symbol that had me stumped.  :woot However, I still don't know exactly what it's intended purpose is yet  :banghead:

mountain:

bfauska,
Hopefully I will be tackling this section of my cabinet this weekend. I will take pictures and draw a diagram of how I do it as I go.

It will be interesting to see how often a coin has been inserted over the life of my cabinet. I have read in other threads about doing this through the software. However, the mechanical counter will follow the machine even if a fresh version of MAME is installed.

mountain:


--- Quote from: SavannahLion on April 17, 2007, 10:57:55 am ---
--- Quote from: mountain on April 16, 2007, 02:15:29 pm ---Spikes are basically the release of stored magnetic energy from a coil caused by fluctuating current levels. These can generally create problems with sensitive electronics, noise in audio circuits (pops, static), and noise in video circuits.

In the Aviation industry, all relays are to be equiped with a diode across the coil.

--- End quote ---

I think I understand. The diode acts as a drain for the excess current. I looked up a schematic example of a diode across a coil and the circuit was on the ground side of the coil. The way it was explained was that as the coil switches to an "off" state, there's excess current that tries to run through the coil but has no where to go. That's what the diode is for. I think I understand why a cap isn't used because you don't want the excess potential just sitting there. Another schematic used the diode to prevent arching. Essentially, the same function, draining excess current and supressing spikes to less than 1V.

Is that correct?

--- End quote ---
Here is a picture a diode installed on a 12v relay for reference for isolation.



Here is a suppression diode installed.







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