Anybody have a pictures of the power supply build?i can't figure it out why my dc voltage drop from 48 voltage to 34-36v as soon as I connect power to the phono board.i'm using antek toroid trans.thanks
You mean the raw DC to the phono regulator input drops? Or the rail voltage after the regulator is 34-36V? In the former case maybe you use highish value filter resistors between bridge and main filter capacitors on the raw PSU board? In the latter case its the normal thing to happen.
dc voltage at the board is 34 volt,at the rail is 30 volt ,TP1 7.63 volt ,TP1 to TP2 is 7.63 volt
What nominal VAC is the trafo? Are there inline power resistors on a raw PSU board and at what value? It should be normally allowing more phono board in+ to rail+ margin.
I try that when i get off work.what strange is,i build the power supply first ,everything measure at 37 volt at the tranny and Dc voltage is 48 volt at the output by itself ,without hooking it up to the board.when everything is hook up that when the voltage drop.
It takes more rail voltage to go right on TP. Got to fix your DCin higher first. Its not strange, its voltage drop across the 50R in the raw PSU RC by the current draw when you hook up the phono as load. You overcompensated anticipation for possibly bit high trafo secondary with that value.
The higest rail voltage i can turn up to is 32.5 voltage.Dc input voltage is 48 voltage.what is the best way to raise Rail voltage to 35 volt.Tp1 to Tp2 is 7.6 voltage,i need to lower that also.Thanks
lapsan
lapsan
got Tp1 to Tp2= 3.5 volt ,sound freaking awsome with my fidelity research fr-1 mk2 cartridge ,not many phono stage can make this cartridge sing. Thank you