We found this transistorized circuit in a 1985 documentation. The circuit can operate with voltages from 9 to 12 V and the adjustment of the operating point or input sensitivity is done in P1.
We found this circuit in a 1964 Electronic Design. It provides 0.5 V signals from 4 kHz...
This circuit is from a 1977 application manual for timers. The circuit provides a negative pulse...
With the precision given by the crystal this circuit provides signals of several frequencies for the...