Hello, I'm attempting to design an audio delay circuit. While electronic engineering is not my specialty, I can solder like a mad man and I have a general idea of what's going on. I was wondering if anyone would be willing to help me along. The thing needs to have audio in (rca and 1/8" mini) and audio out. Adjustable delay from 0-12 seconds (more the better, but 15 would be over kill). .5 second steps would be fine, infinite would be better. Both battery and adapter powered would be nice. It should be small (walkman sized). On/off/bypass switch (of course) and it should be as cheap as possible (of course). The sound quality can be as low but not horrible. I've also heard that Xilinx and @ltera have boards that could be adapted to my purpose, with audio CODECs on them. But, I haven't been able to find these. I explained all this to a guy I know in Ohio, he gave me this:
"If I understand what you're looking to do, this could be done with an ADC, some memory to act as a buffer, and back to analog via DAC. Not really all that complicated. Small pause on startup to fill the buffer. Use an encoder (or even a pot) to set the delay value in the PIC that would be shifting the data out of memory to the DAC. There might be an even easier approach using some analog circuit, but it would be pretty easy to do it via digital/analog converter ICs."
While this paragraph makes sense to me, the actual implementation of all that is way beyond me without a little more guidance. Thanks for your time.
-Mike.
P.S. Ya know, if anyone wanted to just whip me up a schematic, I would be willing to compensate. Make me an offer, if that's your sorta thing.