At least a few times I wished I had a "soundcard on steroids", so that I can replicate a specific waveform I'm getting from a generator, transformer or other devices I'm dealing with (e.g., see this question).
I read this is called an arbitrary waveform generator.
The twist is that I need a high-voltage one and high-power one, reproducing amplitudes to about 250V. On the other hand I don't need high frequency (or frequency precision/stability), so a soundcard followed by ×200 voltage amplification will do the job.
- Frequency: up to 1 kHz, arbitrary waveform, may have DC offset;
- Voltage output: ±250V;
- Current capability: 3A or 300W, whichever is lower (e.g. 100V@3A or 250V@1A);
- Output impedance: < 5Ω .
How can I make such a device? I'm all for buying off-the-shelf parts to reduce work.
E.g. the DDS could really be a soundcard (or a computer-controlled DAC).
For the power amplifier I thought about using a big audio amp, but I'm worried about two problems: they are generally lower output voltage (designed to drive 2Ω or 4Ω loads), and probably cannot tolerate DC offset (I think most, if not all, audio amps use capacitive coupling at the input).
I also found the LME49830 which can be used to build the device I want (albeit "only" ±200V output). It too worries me that it is shown as capacitively-coupled.
What would you recommend?