Dropping coin switch voltage...

modessitt

Volunteer: Encyclopedia Submission Moderator
Joined
Mar 22, 2007
Messages
33,414
Reaction score
325
Location
Austin, Texas
If anyone read my thread about inverting a coin switch signal, you'll know that I've been trying to get an AE2411 dbv to work with a model H Skeeball.

The coin switch has a +5 wire and a Ground wire. When the switch closes, the +5 is pulled low to zero and the game starts and releases the balls.

Anyway, after a bunch of testing today, I discovered that when a dollar is put in, the dbv is only pulling the +5 down to around +3.2. Skeeball recommended putting a high value cap across the two wires to try to hold it low longer, but that doesn't help it get lower.

So - how do I get it lower? Could I put a resistor in series with the +5 line to drop it to +2.5 so that the dbv will drop it down closer to zero? I also don't know the current (nor the way to look for it) in order to calculate what resistor value/wattage to use.

Anyone have any bright ideas that are simple and possible in 2 days using Fry's or Radio Shack parts?
 
If anyone read my thread about inverting a coin switch signal, you'll know that I've been trying to get an AE2411 dbv to work with a model H Skeeball.

The coin switch has a +5 wire and a Ground wire. When the switch closes, the +5 is pulled low to zero and the game starts and releases the balls.

Anyway, after a bunch of testing today, I discovered that when a dollar is put in, the dbv is only pulling the +5 down to around +3.2. Skeeball recommended putting a high value cap across the two wires to try to hold it low longer, but that doesn't help it get lower.

So - how do I get it lower? Could I put a resistor in series with the +5 line to drop it to +2.5 so that the dbv will drop it down closer to zero? I also don't know the current (nor the way to look for it) in order to calculate what resistor value/wattage to use.

Anyone have any bright ideas that are simple and possible in 2 days using Fry's or Radio Shack parts?



5k resistor should do it about 1 watt @ 1 amp that would pull down to zero or very close to it. Maybe use the cap also

EDIT:

Just use a 5k pot and adjust until it works then just ohm out the pot at the working resistance and replace with a resistor.
 
Last edited:
The pot isn't a bad idea, but I don't know that I can take a million different resistors to the location to make sure I have the right one...
 
The pot isn't a bad idea, but I don't know that I can take a million different resistors to the location to make sure I have the right one...

Use the pot, get it to a working resistance, measure the resistance. You can leave the pot for a temp. fix, glue into position so it will not move and measure the resistance. The amperage is probably not even an amp so current issues shouldn't be a problem. The 5k resistor should work.

I would only bring a few resistors 1k 2)5k and a pot 5k. The pot should bring the voltage down and the cap should hold the signal for a good bit. That should get you going.

Let us know.
 
I'll be bringing extras, as I have to do this to three separate machines.

Does anyone think this will solve the problem? Or will I need to do something else?
 
Maybe some circuitry involving flip flop ics and maybe a transistor?
 
I'd be getting a refund on the DBV. I'm unsure how they thought a capacitor would hold the line "low" for longer, it would do exactly the opposite.
 
Another idea would be to have the dba trigger a relay that switches the 5v for ya.

If you saw my other thread, Zitt helped me design a circuit that does exactly this - and it still doesn't work. The DBV is not pulsing properly. If I connect a simple button to the wires to the dbv and push it, the relay fires. Put in a dollar - and nothing.

So- the problem is the dbv's...all three. I wonder if they were set internally to vending only?
 
If you saw my other thread, Zitt helped me design a circuit that does exactly this - and it still doesn't work. The DBV is not pulsing properly. If I connect a simple button to the wires to the dbv and push it, the relay fires. Put in a dollar - and nothing.

So- the problem is the dbv's...all three. I wonder if they were set internally to vending only?

did you get this issues resolved yet?
 
I figured out that the problem is a compatibility issue between the dbv and the old model H computer. Hook it up to a slightly older model S and it works just fine.

So - we have some model S computers on the way...
 
Back
Top Bottom