Circuit for reducing solenoid hold-in power in electronic player pianos and similar keyboard operated instruments

摘要

P the circuit according to the invention comprises, for each solenoid, a logic circuit in order to apply a signal of the tensioning to a switching means, a circuit for chronodéclenchement 43, 44, a source of pulses, oscillating 25 and a means for controlling said logic circuit for supplying the said pulses to the transistor after a predetermined time interval determined by the circuit of chronodéclenchement as long as is now the signal of the put under tension, / p