Power-Amplifier can use as power supply ?

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jengsyber

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I want use power supply 0 - 220V, 20 - 400Hz and i have idea use power-amplifier it can be use?
 

Are you thinking of turning an audio amplifier into a power supply? Theoretically it can be done.

You can input a weak audio signal of any frequency, and get a strong signal out. You can convert it to DC with diodes.

Of course you are aware something can blow if you attach a load which is a very low ohm value.

And a caution in the other direction: An audio amp is designed to have a load of several ohms attached. If you operate it with little or no load, something can be damaged, with the likelihood being greater the higher the volume is cranked up. I unwittingly did this to my guitar amp with the speaker disconnected, and it blew a tube.
 

Audio amplifiers are designed for low impedance drive. The power of audio amplifier depends upon the lad connected to it, for example 100W rms power amplifier with 4Ohm can deliver 200W at 2 Ohm load.
You have to find out input impedance of the equipment before connecting to an audio amplifier. However transformer coupled amplifiers is safe.
 

Just to be on the safe side of things, most audio amplifiers are designed for a maximum load power factor of 45º.

Well worth checking the load before using 'in anger'

Mik
 

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