This circuit was found in a Hands On Electronics from the 90s. It is intended to supply old tape players to batteries with a voltage of 7.5 V from the 12 V of a car battery or source.
This well-known configuration, used in many car radios, is from the Philips Data Book of 1990. The...
With this circuit it is possible to expand the voltage range of a common multimeter, also...
This circuit for very long-time intervals was found in the March 1993 Radio Electronics magazine. Times...