Audio Delay Circuit?

[mikerbot]

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.

 

[Walter Harley]

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. [...]

Does it have to be stereo? You could just buy a guitar delay pedal. Some
of them are that small and have that much delay, I believe.

Are you planning on making one, or ten thousand?

 

[Rich Grise]

Hello, I'm attempting to design an audio delay circuit.

We know. People have been responding to this for three or four days.
Do you ever bother to read answers on google groups?

We don't email answers, you know - we post them.

Sheesh!
Rich

 

[John Woodgate]

I read in sci.electronics.design that Rich Grise <[email protected]>

We know. People have been responding to this for three or four days.
Do you ever bother to read answers on google groups?

We don't email answers, you know - we post them.

I recommend a chain of 2 ohm resistors, each having a conductance of
half a mho. How many mhos in a minute?

 

[mikerbot]

Oops, who is the goose? Me, that who. Sorry, got a little excitted with
posting to every board I could find.

-m.

 

[roma]

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.

http://members.shaw.ca/roma/twenty-four.html , choose your circuit ,
use a DPDT relay for stereo , use a pot for delay setty or rotary
switch combine with capacitors and resistance for time delay .
roma