Is it ok to convert 6.3v C.T. sec. to DC?

[TransLucid]

That's a good question. If you're using a voltage doubler, the 6.3V winding will be elevated, so you can't ground the CT.

[MikeM]

Sorry to barge in, researching relays here, what kinda input would Moore's design need? 12.6v?

[Wilder Amplification]

That's a good question. If you're using a voltage doubler, the 6.3V winding will be elevated, so you can't ground the CT.

You most certainly can! You just can't reference any part of the doubler circuit to ground. The doubled voltage would be "floating".

[Steve Conner]

Here's a circuit I used:


It provides 12V DC for switching circuitry while leaving the 6.3V AC heater supply centre tapped to ground.

You need pretty big capacitors, like 2200uF or more, but they're physically not that large because of the voltage rating. Runs three small 12V relays and a bunch of LEDs nicely.

(I always wondered if the circuit could be turned upside down for a free +12V heater elevation.)

[MikeM]

Steve I assume that running a virtual tap wouldn't work with that?

[Gregg]

Here's one more solution from MB Mark4.