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RE: LM7805 voltage drop when attach load

Without seeing your setup I can't be sure but it sounds like you might be placing a dead short or very nearly a dead short on the regulator output.

Have you tried a known fixed load on the output of your regulator like a fixed value power resistor.... maybe 100 - 10 Ohms which should draw about 50mA - 500mA?

I would use one of the larger resistance values for test purposes unless your regulator has a heat sink on it.... or place the resistor load on it momentarily just long enough to measure the output at the regulator.

If the output voltage from your regulator is 5v with the resistor load, then something is wrong with your circuit after the regulator.

Edits: 06/26/17 06/26/17

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  • RE: LM7805 voltage drop when attach load - AbeCollins 05:18:44 06/26/17 (0)


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