We found this circuit in a 1965 magazine. The circuit can be assembled with current equivalent transistors and the precision in generating the frequencies depends on the tolerance of the capacitors.
The bridge diodes of this circuit, found in a 1967 publication, are according to the motor...
This circuit prevents the passage of frequencies in a range starting at 1 kHz and can be adjusted...
Found in a 1964 Electronic Design, this circuit generates 1 A pulses with durations from 100 us to...