Eeyore wrote:

Serge Auckland wrote:

"TonyL" wrote in message

I've found a couple of HY60 amplifier modules in my junk box. I have a
data sheet which indicates a +/- 25v power supply voltage rails
requirement but no indication of current. Power into 8 ohms is 30W. If I
put a power supply together what sort of current should I be expecting to
supply to each module ? Presumably, a simple dual rail
transformer/rectifier/electrolytic type of supply would be OK ?
Nice little amps!

Assuming that you're not going to be using these amps to drive some extreme
loads, then 30 watts into 8 ohms is a current of 1.94 amps, add a little for
the amp's overhead, and so you need a minimum of 2 amps per amplifier.

2 amps at +/- 25V ? That's 100W of DC per amplifier. Even run continous sinewave
it won't need that ! You're forgetting the current is shared between the + and -
rails.

1 Amp at + and - 25V per amp would do very adequately even for continuous
sinewave duty.

What if you want to listen to the latest Metallica album? That's 1.4A
per HY60 per rail, or twice that using 4 ohm speakers.
Best to get 4 car batteries, just to make sure.

--
Eiron.