[UM-LINUX] waveform generator in linux

[as]

hi,

i need to be able to generate simple analog waveforms (square pulses) at a given frequency (1-1000Hz) and voltage (0-12V) for a given period of time (0s-60s).

i'd want it to work well under linux and be reasonably priced. fa PCI-based DAC card should do the trick, but from what i could see, there is a lot of high end multi-channel cards which costs $400 or above, and my needs are far more modest.

i'd be glad to have any advice on what is the best hardware to use and where to buy such hardware.

thanks,
aravind.