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This simulated circuit shows how a transistor voltage regulator can be used for a relay coil.
This is an example of such use:
https://static4.tme.eu/products_pics/4/a/4/4a420e5be8a530b2a41ef92af37d1287/24854.jpg
With voltage regulators the input voltage is not limited to one fixed value, for example 24 VDC. but can vary between 24 and 230 VDC and AC.
In the simulated circuit, the voltage regulator limits the voltage to the relay coil to 24 V.
At the top left the DC supplies are situated. On the top right the AC supplies. The present DC and AC (rms) voltages will be: 12 V, 24 V, 48 V, 110 V and 230 V. With the C.O. switch, a choice can be made between AC and DC supply. With the N.O. switch, the circuit is powered.
The current will flow through a full wave bridge rectifier and then through the transistor regulator.
As a result; the relay coil will switch and the LED will emit light.
When the input voltage is going below 24 V. the output voltage will drop also. The relay and LED will not be (completely) activated.
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