Quote Originally Posted by PJALM View Post
Here is a very simple one I found that uses a 18F4550.

http://ostry.w.szu.pl/miniscope.php?lang=en

They also have some more complex models as well but this one includes everything and its free.
Hi

The sample rate of 25kSPS won't allow for much. Won't even cover the audio spectrum. (25kSPS / 10) = 2.5KHz. For some half-decent performance, at least half a dozen or so chips are required. Analog front-end using an OPAMP, discrete ADC (at least capable of 2MSP/s), SRAM - 32KB, address counter IC, micro controller to shuffle the sampled data to the host - (PC in this case), calibrated time base’s - micro controller won't be fast enough to set sample rate or address the SRAM. Big job to come up with some decent goods. Doubt I’ll bother if I can’t get at least 1MHz of solid bandwidth.

Best Regards,

Trent Jackson