We found this circuit in the 1957 Raytheon transistor application manual. The transistor can be a BC558 and the common 6 V relay, just by using this voltage in the supply.
This old circuit, from the 80s, was found in American documentation. The circuit uses dual gate...
The value of R1 given by I = R1 / 5 determines the load current of this circuit. The maximum...
This circuit, found in a 1994 documentation, eliminates the hiss (static noise) that occurs when...