Whats the best way to regulate a PS down?

[downhere]

I'd like my PS to be +-35V after rectification and the cap bank. However, its closer to 39V. How can I reduce voltage from the powersupply? would voltage dividing resistors do the trick? or is there some other better way?

 

[Hoffmeyer]

Is it a constant current, you're drawing from the PSU?
Is it a low or high current, your drawing?
Is the 39 Volt with or without load?

If it's not a constant current, but sometimes a high one, the problem is the small difference between the unregulated and regulated voltage, since the voltage drop-out(that's the the minimum difference between input and output needed, before the regulator's regulating) for a high-current regulator's typically 4-6 Volt.

In short: more info's needed.

 

[downhere]

Yeah sorry

I'm using it for an audio amplifier
its 39V without a load. Currents are slightly more than 1 amp per channel

 

[Hoffmeyer]

If the current's constant, and the PSU is not a total overkill, the voltage might drop a couple of volts, which brings it down to where it's difficult to use a regulator.

If the current's constant, you can use a small resistor, @ 0,47 Ohm, between two capacitors, a C-R-C filter.

 

[downhere]

How many watts?
Thanks

 

[Hoffmeyer]

P = I*I*R => P=½W + a safety-margin.
If I was You, I'd use at least 2Watt resistors.

C-R-C

GND

C-R-C