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Old 11th March 2010   #1
changeng
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adding safety diodes to the regulators for a Symetrix 522

HELP! i need some input so I don't hurt innocent humans...

with some further research, and PLEASE correct me if i'm wrong! the circuit board on the 522 is not easy to eyeball, and i don't have a meter to measure voltage - so looking at the schematic...
Where can I find Schematics for the 522 Compressor / Limiter / Expander ?

it appears that the "1" pin (or 'in" pin to the left on the regulator) goes to the 1000uF cap and the "3" pin goes to the 4.7uF. Although the schematic isn't too clear to me either, I'm thinking it's the same layout for all four regulators? (if i'm wrong, please tell me before I burn down Los Angeles?)

Since the UNregulated cap is the 1000uF cap and the REGulated cap is the 4.7uF cap,

For the POSITIVE regulators (the 78M's)I need to put the banded side of the diodes on pin "1"

For the NEGATIVE regulators, (the 79M's) I need to put the banded side of the diodes on pin "3"

and I am assuming the non-banded side of each diode is soldered to the non-earth pin on each regulator - so each regulator has it's own "closed-circuit" diode?

my head i turning to noodles.

Please help and many thanks!!!!

Stuart

Last edited by changeng; 12th March 2010 at 06:49 AM.. Reason: clarifying
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