Abstract: A coin validation circuit and method of operation thereof, including a memory having stored therein a data entry for each acceptable denomination, a validation control circuit, preferably including a microprocessor, operatively connected to the memory, a ringing circuit operatively connected to the validation control circuit and operable to produce damped wave output signals, and a monitor circuit operatively connected to the ringing circuit to respond to a particular predetermined damped wave output signal characteristic, the validation control circuit operable during a coin validation operation with respect to any one of the acceptable denominations to retrieve from the memory a predetermined data entry, to produce a conditioning signal corresponding to the retrieved predetermined data entry to effect a pre-conditioning of the ringing circuit in accordance therewith, and to thereafter produce a ring initiation signal, the ringing circuit responsive to such ring initiation signal to produce during a ringing