simple electronic organ

Posted on Feb 7, 2014

This electronic organ is very simple to construct and can provide hours of enjoyment particularly for children. The circuit is basically an emitter-coupled oscillator composed of T2 and T3. An squarewave voltage can be sampled from the collector of T3(X2). This signal gives the tone a clarinet character. Without the squarewave signal, the sound pr

simple electronic organ
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oduced by the emitters of T2 and T3(X4) has a violin character. An additional vibrato signal can be added to this basic sound through switch S1. The frequency of the vibrato is approximately 6 Hz. Its amplitude is determined by the resistor R4. The value of R4 can vary from 100 up to 300K. Try experimenting with different values. The keys can be made of either metal plates or etched printed circuit. The trimmers P1 up tp P8 adjust the pitch of each tone. The tones can be drastically changed by changing the value of C4.

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