We found this circuit for musical instruments in the March 1992 Radio Electronics magazine. The circuit has outputs according to the desired scale from a crystal oscillator at the indicated frequency.
This circuit was obtained in a documentation of the 80s, using operational of the time. The...
This circuit is suggested by American documentation from 1970. It makes use of transistors of the time...
We found this circuit in a 1967 IEEE documentation. The circuit uses discrete components of the...