I've got a project coming up where I need a signal generator on steroids to help in the development. I need to generate a signal which can go up to 30v or more in voltage mode and up to 5A in current mode. Frequency somewhere between 0.1Hz and 400Hz. Typical waveforms ie sine/square/ramp. If it did bipolar then so much the better. I need to run in either controlled voltage mode or controlled current mode.
Generating the initial (voltage) waveform isn't a problem. I've got a DDS function generator and two PC based AWGs within an arms length. My problem is beefing those up.
I could make something but, for me, time is money. By the time I've built something, built the power supply for it and put it in a box it'll not be cheap. So a voltage amplifier/voltage to current converter.
I could take some sort of commercial audio amplifier, bypass any output capacitor and figure a way to run it CC as well as CV. But again, it'll take time and might not work.
I have seen programmable DC power supplies out there for not too much money. Some have an RS232 port on the back so I guess I could knock up some simple code to control them. Other can be programmed from the front panel but they all seem to suffer from slow changes in output. It seems quite common that each step of the output waveform has a minimum time of 1s.
In my head I'm looking for a DC bench power supply with two input sockets: one which controls the output voltage, the other which controls the current limiter.
Anyone got any thoughts?