Hi Gabriel, what exactly do you want the detector to do and
what sort of application is it ? For example do you need to

- detect any metal coin
- detect counterfeits
- differentiate and count coins
- have any sort of reject system
- comply with any commercial laws re performance

etc etc

I have made my own coin detectors (not strictly what's known
as a "coin mechanism"). A sloping chute with opto-interrupters
at different heights to detect and count the 6 NZ coins. Basically
it's a digital system. If you can do the engineering and wire up
diodes it's pretty easy

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