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Hi, just for fun I tried this circuit out from a Hohner symphonic 30N analog organ from the 60's. The schematic is missing the 300v voltage regulator that consists of two OA2 150v vacuum tubes in series and a 240 Ohm resistor, and run between the ground and output 1, I am not sure how to do that here. Still it seems to work with the Time domain simulation. It takes about 2 seconds for the Out 1 to get up to +300v. After a few seconds though the + and - voltages start moving toward zero again?? Only the - 12 volts stays steady. Do I need a load on the other voltages?
Great fun this, now if I could only understand it!
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January 21, 2013 |
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Welcome to CL. D1 is the wrong way round. Swap anode and cathode for a -12V output. :) |
January 21, 2013 |
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Sorry, I'm talking rubbish ... Your zener, D1, is the right way round. |
January 21, 2013 |
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