I have a (big) transformer I salvaged, the primary wires are L/ground/N and scondary provides 2 reds a red with white stripes-/+55v (wich I dont plan on getting anywere near) 2 blue and a blue with white stripes -/+ 14.3v. Im planning to power an amp to add a good boom to my house sound system, Im using my car amp, i have the transformer wired into a 50a bridge rectifier, and. Just beacause I have them and never used them before i connected a big 10,000uF 75vdc cap, wich then I connected to the amp, i had my multimeter connected at the connecting strip and i tried powering it no sound comes out and the amp goes straight into protect mode, the meter read 16-18v dc. I thought about putting a L7812cv i have but it only does 1a tops. Any advise would be greatly appreciated. I know the risks I run and I do take necesary pracautions. HELP PLEASE 
Hi,
If its a normal audio transformer, the high voltage rails are also high
current rails, and the low voltage rails are also low current, for the
pre-amp stages, and they simply won't drive a power amplifier.
You'll probaby end up just burning out the low voltage rails.
Measure the DC resistance of each secondary and report back.
rgds, sreten.
If its a normal audio transformer, the high voltage rails are also high
current rails, and the low voltage rails are also low current, for the
pre-amp stages, and they simply won't drive a power amplifier.
You'll probaby end up just burning out the low voltage rails.
Measure the DC resistance of each secondary and report back.
rgds, sreten.
Whats the max current the transformer will supply? Easiest way to go; (depending on the current output),use a large (50 watt) zener (or two), or a string of regular diodes (might be cheaper and not need a heat sink) to clamp the voltage.
Just string 22 of these together, no heat sink required. Amazon.com: 10 Amp 1000V Axial Diode Rectifiers (Pack of 30): Everything Else
You dont need a regulated supply, the amp will do that itself, so the regulator circuit would be overkill. And a lot more complicated (you would need a large power transitor)
Just string 22 of these together, no heat sink required. Amazon.com: 10 Amp 1000V Axial Diode Rectifiers (Pack of 30): Everything Else
You dont need a regulated supply, the amp will do that itself, so the regulator circuit would be overkill. And a lot more complicated (you would need a large power transitor)
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