Here is the power supply for the upcoming opamp regen. Three things are worth noting. 1. It is not necessary to use separate diode bridges for the positive and negative supplies. One will do, but I saw that after I built the board. 2. The power switch is after the transformer, rectifier & filter so I do not need to add a noise source to the cable going to the front panel. 3. The pinouts of the 7812 and 7912 are different. Do not confuse them.

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