This circuit can be used as an answering password system in a store, office, or other location. The circuit is from Intersil using components of the time. The circuit is from the 80's.
It can be obtained from Mouser Electronics new crystals for surface mounting from AVX with...
This effect for guitar was found in an English magazine from 1978. The transistors can be the most...
This circuit was published in a January 1971 issue of Radio Electronics to check television...