This circuit is from General Electric documentation from 1970. The transistors can be of general-purpose types, except for the power that can be a BD136.
This circuit maintains on a flashing LED at a frequency determined by the capacitor. The...
We got this circuit in an old publication from 1978. The circuit uses a phototransistor and an...
This simple LDO, or low voltage drop regulator was found in an Electronic Design from the 90s. The...