PlANO_MUSIC_FROM_ORGAN

Published:2009/7/1 21:29:00 Author:May | From:SeekIC

Simple add-on circuit for electronic organ attenuates output of oscillator exponentially to zero in manner suitable for mimicking waveform of piano. Circuit is self-triggering, so exponential decay starts only when output of multivibrator is applied; this eliminates need for extra contacts on key-board. With no input, Tr1 is on and point A is at supply voltage. Input signal turns Tr1 off, discharging C3 through R3 and R5. Voltage across C3 controls gate of FET, with R5 being adjusted so FET just switehes off when C3 is fully discharged. Tr1 then conducts and C3 charges rapidly, to permitfast piano playing.-C. J. Outlaw, Electronic Organ to Piano, Wireless World, Feb.1975, p 94.



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