I have been design various type of timers, exclusively for use with coin-operated game machine.
Different models are based on Atmel’s 89X5X or 89CX051 processors.
One of them sample is presented here.

Features:

• Timer for coin-operated game machine.

• User-programmable 0 to 3 coins.

• User-programmable time duration up to 16 Min. in 30 sec. steps.

• Relay O/p for start, end and game run.

• Two channel sound O/p.

• A connection provided for mechanical counter for total coin count.

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