Variable frequency AC power supply with DC offset

Thread Starter


Joined Jul 3, 2009
Hi all,

I'm searching soms schematics or circuits for a variable frequency AC power supply (sine wave) with variable DC offset.

Needed Specs :
freq : about 0~10kHz, 3A current max, 100V pp max

Maybe this thing I'm searching for has a specific name but I don't know the name (if it has some).

I tried following approaches :
a) searching for a function/awg generator circuit with heavy duty output.
b) using a function generator with an audio amplifier
c) using a VLF transmitter

With approaches b) & c) there's no DC offset possible :s

Now this question is not a question to exactly describing such supply, but rather for pointing me in the right direction.



Joined Jan 11, 2009
Output circuit is basically an audio amp, you may want to have it dc coupled. This sucker is in the 200 - 300 watt range so amp is substantial and will need at least a 100 v power supply. You could build one and get just what you want or buy and see how close you can come. Are you sure this is a circuit you want? ( can you tell us what for )?

Thread Starter


Joined Jul 3, 2009
Maybe I can use an 100V PA amp.
The reason why I need this is for an hobby experiment.
Basically I want to run AC AND DC over 1 cable pair so I can split it at about 2m further in pure AC and pure DC.

I know it's much easier to use 2 cable pairs (one for AC & one for DC) but hey, I'm just experimenting ,)

Edit 1 : a 100V pa amp won't do the trick, all 100v pa amplifiers I saw have an step-up transformer on the output :s
Edit 2 : what I'm looking for is a circuit/schematic for something like this :
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