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RE: Is this feasible? Rectifying 6.3v for heaters





Hi Pete,

Above is the heater ballance circuit. Is it necessary? No, the OEM circuit worked fairly well actually. Is it silly? Probably so, but I wanted it and I could do it so I did.

The - input of the op-amp is referenced to ground. The average of the + and - supply is applied to the + input of the op-amp. If they differ either the 2N2219A or the 2N2905A as required will draw current such that the + and - voltages are symmetrical around ground.

I'm sleepy now but tomorrow I'll scan the updated B+ supply and post it.

I'll also add to the heater supply schemo to show how I did the new LED light for the off/on push button.

Phil

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