Electronic circuit for voltage supply

摘要

An electronic circuit for the voltage supply of other circuits has at least two voltage circuits that can be connected electronically by switching items and a switch in one of the circuits. The first circuit is connected to the switch via at least one resistance, a reverse-biased zener diode and a transistor. The switching items have a terminal between the circuits at which the supply voltage to the circuit-to-be-supplied is tapped off. The voltage supply for this circuit-to-be-supplied when the switch is closed comes from one of the two (at least) voltage sources. The switching items for each circuit comprise an analogue switch formed from two FETs.