Variable frequency AC power supply with DC offset

Discussion in 'General Electronics Chat' started by Spacer76, Jul 3, 2009.

  1. Spacer76

    Thread Starter New Member

    Jul 3, 2009
    2
    0
    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.

    Regards,
     
  2. russ_hensel

    Well-Known Member

    Jan 11, 2009
    818
    47
    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 )?
     
  3. Spacer76

    Thread Starter New Member

    Jul 3, 2009
    2
    0
    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 : http://www.krohn-hite.com/htm/amps/mod7500.htm
     
    Last edited: Jul 4, 2009
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