We found this circuit in a French documentation from the 80's. The components used are still common and the circuit can generate signals from 10 Hz to 100 kHz.
This circuit was found in a 1965 General Electric publication. The circuit can be adapted to...
We found this circuit in a 1972 RCA technical documentation. The comparator can be any type and C1...
This bargraph circuit was found in the January 1986 issue of Radio Electronics magazine. It is...