Sunday, November 25, 2012

Transistor Organ

This simple circuit can provide hours of enjoyment as you learn tunes, play duets or just make some really weird sounds by pushing all the buttons at once. You have probably seen this ciruit before, it is fairly common. I have seen it in several books. The best thing about the circuit is that you can tune each individual note, or go to a whole new octive by changing one capacitor (C1). Because of this, it is possible to from an entire Transistor Organ ensemble. Why you would want to do this is anyone's guess...

Schematic

This is the schematic of the Transistor Organ

Parts

Part
Total Qty.
Description
Substitutions
R1-R88250K Trim Or Regular Pot 
R9, R122100 Ohm 1/4 W Resistor 
R10110K 1/4 W Resistor 
R111220 Ohm 1/4 W Resistor 
R1315K Pot 
C110.01uF Capacitor 
C210.1uF Capacitor 
Q112N4891 Unijunction Transistor 
Q212N2222 Transistor2N3904
S1-S88SPST Switch 
SPKR18 Ohm 2 W Speaker 
MISC1Wire, Circuit Board, Knobs For Pots 

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