Coin counter help - suppression diode/voltage?

LordOfDoubleDee

Well-known member

Donor 7 years: 2018-2024
Joined
Jan 6, 2018
Messages
2,182
Reaction score
508
Location
Anaheim, California
Really could use some help wiring in my coin counter. Read the Bob Roberts article but am still not sure how to use my meter to check the needed voltage and need to figure out if my coin meter has an internal suppression diode.

I know that one lead is going to go to the power supply (voltage?) and that the other will be connected to 8 on the Jamma harness.

Attached are pics up my coin counter and my meter

Thanks for the help!
 

Attachments

  • IMG_0888.jpg
    IMG_0888.jpg
    88.2 KB · Views: 13
  • IMG_0889.jpg
    IMG_0889.jpg
    103.4 KB · Views: 11
  • IMG_0886.jpg
    IMG_0886.jpg
    107.1 KB · Views: 12
And one more thing I was curious about: can someone tell me about the "memory protect" and "audit menu" switches next to the coin counter? What did those do and could I make use of them (service/test)? Thanks
 

Attachments

  • IMG_0890.jpg
    IMG_0890.jpg
    92.6 KB · Views: 8
Ken,
Meter bottom says:
KE-610 Counter
DC12V

See attached pic

Still not sure how to proceed?

New to this and learning (but having a great time!).

Thank you!
 

Attachments

  • IMG_0897.jpg
    IMG_0897.jpg
    140 KB · Views: 24
Okay, so I used the Diode tester on my meter and it looks like the coin counter is allowing voltage to pass Both ways which means (I think) that this coin meter needsan external diode suppressor to keep the 12v from traveling down the coin meter lead and damaging the PCB.

I also took a wire, hooked it to the 12V power and sent it to one lead on the coin meter, checked the other open lead and alas, 12V. Then I unhooked that connection and attached it to the other lead on the coin meter, checked the open lead and 12V again. It looks to me like the meter is passing power right through it.

Definitely not going to connect this to the PCB right now - should, and where do I, get an external suppressor? If I attache that to the coin meter wiill that work and will the board be safe?

Thanks
 
I could tell by what was printed on the meter that is does NOT have a built-in diode. You need to use an external 1N4004 or 1N4007 diode.
 
Excellent - i'll definitely purchase one of those. Felt good to do some testing on my own, building confidence! I'm figuring this out :) thanks again for your help
 
Going to go pick up some diodes here in town. I think I've got this figured out (with Ken's help) can you take a look a this diagram I drew and let me know if this is correct? Also, I'm assuming that the diode can be wired in line and exposed? Doesn't need to box protected/covered (case). Noob here - but learning - love all the help - greatly appreciated!
 

Attachments

  • CCI15012018_2.pdf
    240.3 KB · Views: 38
WRONG! Won't work that way.

The way it should be wired is:

One meter lead AND the banded end (cathode) of the diode to +12 volts.

Other meter lead AND the unbanded end (anode) of the diode to JAMMA pin 8.
 
SHIT! :) Picked up the diodes today but didn't have time to get out there - good thing - would've wasted a bunch of time and/or hurt my PCB.

I think I've got it now - see attached schematic - thanks much - it's making sense.
 

Attachments

  • CoinCounterWiring2.pdf
    241.4 KB · Views: 62
Ken, thanks for your patience, greatly appreciated. I went back through the other thread where I found the Bob Roberts article and it's funny, the other poster basically went through exactly what I did, even drew the diagram incorrectly, and then finally figured it out. I don't know how I missed that before but thanks for stepping through it with me again, hopefully this thread will help someone else in the future, have a great week!
 
Just remember whatever voltage meter you have, you connect to the matching voltage on the power supply.

Say for example you have a 12 volt meter. Naturally it connects to 12 volts. Now what if you have a meter from an Atari or Midway game and it's marked 10 volts? Well that would go to 12 volts. If you have a 6 volt meter it connects to the +5 volts on the power supply.

This will help other people who happen to have different voltage meters.
 
Back
Top Bottom