Complementary supplies

165

02:20:14

An application of this circuit could be with a device that has two supplies and when the first one is not available,  the second one (that could be a battery) replaces it, otherwise it stays unplugged. 

published 12 years ago

Secuture

12 years ago

Actually one diode do the same and u not suffer loses from resistor have only two terminals to solder and anydiode can be used. Ofcourse circuit became so simple that no one pay attention on such.

mantech

12 years ago

But with a diode both supplies would give power to the LED at the same time.. won't they?

Secuture

12 years ago

No diode switch off circuit when u close button and impres higher voltage As sources are equal diode make steal from one typicall 0.7v so after diode we have 4.3v so when u impress full 5 volts polarity change at diode will be 4.3 - 5 = -0.7v and such is reverse so diode turns off blocking whole node and suply. Try using diode instead trannsistor

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