Switching 12-volt electromagnetic relays from a voltage source is half that. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Clocks, timers, relays, load switches
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The proposed scheme makes it possible to ensure the switching of 12-volt electromagnetic relays from a source with a voltage half that.
In the initial state, T1 and T2 are closed, and C1 is charged to a voltage of 6 V through the R3-C1-D2 circuit. With the advent of the control potential, T1 opens, connecting the positive plate C1 to the common wire and at the same time opening the transistor T2, which connects the upper output of the relay to the +6 V bus.
Thus, the relay is before the discharge of C1 under a voltage of 12 V and is activated, and after the discharge of C1 under a voltage of 6 V, which, however; enough to keep it that way.
Author: R. Graham
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