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-   -   NEED help figuring out this coin sensor / switch thing!!! :-) (http://www.diyaudio.com/forums/parts/36102-need-help-figuring-out-coin-sensor-switch-thing.html)

multiplexor 15th June 2004 01:37 PM

NEED help figuring out this coin sensor / switch thing!!! :-)
 
Hey guys!

I need help!!!

I want to know what the symbol is in this image, on the left side, in the oval... I'm assuming photodiode type thing....

It's for a coin sensor... I'd like to know if I cross wires 2 and 4, if it will complete the circuit and trigger a fake coin...

Thanks a million!!!

http://www.multi-designs.com/org/coinsensor.jpg

multiplexor 15th June 2004 02:03 PM

to help out... i Believe this machine is from the late 70's....

could it be?

it's a maytag commercial washing machine...

jneutron 15th June 2004 02:19 PM

I make the assumption that the coin will interrupt the light between the led and the photo-transistor..

Disconnecting wire 1 will do the same thing.

John

Tall Shadow 15th June 2004 02:31 PM

Looks to be a LED to Photo transistor set up.

I don't think You would get what you want,by crossing wires 2 & 4.

What you need to do is to pulse the power through the LED and trigger it in to thinking it "Sees" a coin.

Good Luck & let Us know what happens!
Tall Shadow

multiplexor 15th June 2004 02:41 PM

Quote:

Originally posted by Tall Shadow
Looks to be a LED to Photo transistor set up.

I don't think You would get what you want,by crossing wires 2 & 4.

What you need to do is to pulse the power through the LED and trigger it in to thinking it "Sees" a coin.

Good Luck & let Us know what happens!
Tall Shadow


pulsing it like jneutron mentionned, where i disconnect and reconnect it?

or?

:)

Oh, and i'll definetely let you know how it goes!!! :D

Devil_H@ck 15th June 2004 06:22 PM

jneutron didn't say to pulse anything, he said to disconnect 1. And I think he's right, it looks like the most normal thing to me. Having a dropped-in coin actually generate a pulse would be harder than having that led & photo-transistor thing.

multiplexor 15th June 2004 06:48 PM

coolies :D

I will possibly give this a shot...

It's tricky... I've posted this on a couple other forums and not one person has really given the same response....

some say disconnect 3 and 6... some say you can't because it's digitally timed... though being that the machine is so old, I figure it's probably not...


I like the idea of disconnecting and quickly reconnecting wire 1...

It sounds very resonable!

jneutron 15th June 2004 06:52 PM

The circuit can work in one of two ways..

The first, is the led shines directly on the transistor, and it remains on...when a coin passes between the two, it interrupts the light beam, and the transistor turns off. This is the more reliable method, as the surface of the coin does not matter. To fool the electronics, either disconnect one of the transistor leads or the led lead.

The second method is to have the led shining away from the transistor, and then the coin reflects the light to the transistor, turning it on. This is a less reliable method, as it requires the coin be shiny enough to reflect the beam, but it does allow a more compact led-transistor package, if cost were an issue. To fool this one, shorting the emitter/collector together will fool the circuit into thinking the transistor was on.

Either technique can be spotted by the geometry of the mechanical setup.

John


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