This circuit is from a 60's documentation. The capacitance C1 can be between 20 pF and 0.01 uF depending on the generated frequency. Equivalent transistors may be employed.
Using a 4018 IC and one gate of the 4081 it is possible to divide the frequency of digital signals by...
Found in a 1980s documentation, this circuit detects when the voltage drops below 11 V. Other...
This circuit triggers in 100 microseconds in case of excess voltage. The adjustment is made in the...