This circuit uses only transistors and was found in a 2003 documentation. Transistor 2N3055 must be mounted on a heat sink and the voltage is set to R10.
This circuit for 12 V x 2.2 W lamps was found in a documentation from the 70's. The circuit uses...
This circuit produces a low frequency magnetic field used in old inductive remote controls with a...
This is an interesting configuration of the LM317 voltage regulator found in an EDN from the 90s....