We found this circuit in the May 1996 Electronics Now magazine. The relay must have a voltage according to the circuit power supply and a trigger current of no more than 50 mA.
This circuit amplifies signals from 0.5 Hz to 300 kHz. We found it in an old documentation. Equivalent...
This circuit was obtained from an American documentation of 1967. The circuit provides a 30 mA...
This circuit can be used to measure the frequency of a low frequency square signal. The signal can be...