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.
We found this circuit in a 1992 documentation. It consists of a digital signal splitter used in...
This 1986 documentation circuit provides 3, 4, 5, 6 V voltages under 350 mA for powering walkmans...
This circuit isolates a stage with Triac from a TTL or CMOS trigger circuit, for example. The...