Shaka Tube Voltage Help Please!!!!!

[Scott1968]

Hey all! I am running 13.8 vac into the voltage doubling circuit, how many volts should I be getting at v+,v-, and is this output ac, or dc voltage! I am trying to find out how many volts this circuit runs off of! Thanks..

[duck_arse]

hello and welcome to the forum.

can you post a circuit or a link to a circuit, so's we know what's is?

[aron]

This might help:
http://www.diystompboxes.com/smfforum/index.php?topic=11857.0

[amptramp]

It will depend slightly on the transformer resistance, but the 13.8 volts is the RMS (root mean square) value of voltage output.  This is the value of DC voltage that would give the equivalent power dissipation from a resistive load if it was a DC source.  The peak value is 1.414 time this, which is 19.5 volts peak.  Since you have a doubler, it will be twice that or 39 volts peak.  Knock off a couple of diode drops (~ 1 volt) and the circuit runs from 37 volts.  In actual fact, the output may sag a bit under load.  If the transformer is really overtaxed, you may sink as low as RMS voltage minus diode drops which would be 27.6 - 2 volts of 25.2 volts, but the actual value assuming an adequate but not oversized transformer should be around 35 volts DC.