[sdiy] 1 bit serial stream delay approaches..

[Eric Brombaugh]

On 09/19/2012 07:26 AM, Jean-Pierre Desrochers wrote:
>
> So I need to delay a 1 bit serial stream (incoming Gate signal)
> for up to 5 sec. (my needs). I thought of the shift register way
> to do it but I'm not willing to use a ton of cmos IC's..
> Maybe a Microchip PIC would do with a reliable interupt routine.
> But would it exist any IC that does this job easily
> without any programming ?
> In fact a 1 bit digital delay without any ADC-DAC is what I need.
> Remember, the incoming Gate signal can be anyhthing else
> than a simple ON... then OFF state.
>   (ex: ON.......OFF..ON..OFF..ON...........OFF...etc..)

There's an interesting circuit here:

http://www.all-electric.com/b&c.html

If you strip off the sigma/delta ADC/DAC on the input & output it's 
basically a 65536-sample 1-bit digital delay. By varying the clock rate 
you can change the overall delay over a wide range.

Not as elegant as the software solutions mentioned earlier, but 
certainly workable. I've built one of these but replaced most of the 
digital logic except the memory with a CPLD, so it's possible to do it 
with much fewer parts.

Eric