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Voltage regulators do not work properly when they are in parallel. The one with the highest voltage will hog the load until it overheats or begins to limit the current which reduces the output voltage. Then the regulator with the next highest voltage begins to work. So one regulator is hot and the other is cold.found all sorts of circuits with the 78xx and the 79xx in parell.
A 30V center-tapped transformer is 15V-0V-15V and will produce an unregulated supply of +20.4V and -20.4V which is much too high and the regulators will be extremely hot.I need to order a different transformer-I mistakenly ordered a 24v but need at least 30 as I need a 12v+ and a 12v- plus a ground.
Multiplexing caused noise but it is gone so the opamp buffers are not needed.U5,U6 are buffers to prevent any noise (yes no maybe? from entering listening audio (what else to call it?)
The datasheet doesn't know that the new peak detector transistor circuit is driven from the very low output impedance of an opamp so the resistor does nothing.the R17 and associated circuit is from data sheet.
Good riddance.be nice to drop the U5 etc op amps.
A 7805 is a voltage regulator, not a current regulator. LEDs do not need regulation, they just need a series resistor to limit the current.finishing up a 7805 current regulator circuit for panel led back lights and EQ/FLAT indicator led.
Something is wrong with TINA for the low frequency peak. Maybe the pot is not adjusted the same as before. The high frequency peak is fine.I reexamined the sweeps with and without U5 and U6
the sweep loses its peaks.