Making a Coin Drop
We had an instrument ready to go into our self tour no charge area. The instruments that play there use a quarter coin to make them play one song. The Cremona C that was destined to go there, had no coin drop mechanism. Commercially available ones are way too expensive for our budget, so we decided to make one. The design is not ours. It is patterned after our Johnson Nickelodeon, which was built in 1908.
The good thing about this design, is that with some wood, a table saw, a few scraps of copper and some time, it costs almost nothing out of pocket.
You route out the wood to fit the coin, make the two copper parts, one fixed, the other moveable and you are in business.
The coin slides down the slot until the copper parts trap it and at that point the coin itself completes the circuit and starts the instrument.
When the song finishes, the moveable copper part is slid over and the coin is released, breaking the circuit and stopping play.
Of course you have to make a pneumatic to work the moveable piece and get it all to work freely.