Tuesday, August 19, 2014
Stereo to Mono Converter Based on FET
Parts:
P1 = 10K-50K Pot
P2 = 10K-50K Pot
R1 = 100K
R2 = 100K
R3 = 6.8K
C1 = 0.1uF-25V
C2 = 0.1uF-25V
C3 = 0.1uF-25V
Q1 = 2N3819 Junction FET
J1 = Audio input sockets
J2 = Audio input sockets
Notes:
* As many or as few channels as are required can be added to the mixer.
* Do this by just duplicating the input "sections" which are clearly shown on the schematic.
* One version of this mixer I saw had 18 inputs!
* A shielded case is probably needed to reduce hum and help stop oscillations.
* P1 and P2 are dual gang potentiometer for stereo version.
* The schema can be powered by a single 9 volt battery.
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