[sdiy] digital delay, was ...

[Grant Richter]

> All these delays will be built with dual-section chips, such as the
> SAD1024. The desired signal only flows through one half of the chip. The
> other half of the chip is used as an "empty" second channel. In other
> words, make a stereo delay unit, but only use one channel for your signal.
> Using dual chips keeps the two channels fairly well matched to each other
> in frequency response, noise level, etc.

Can anyone say WHY BBDs are so noisy. It must be the physics of the chip,
right? But why would a string of capacitors be inherently noisy? Perhaps an
understanding of the mechanism would suggest something new.