[sdiy] 2 multimeters showing different voltages

[limor]

cut a cheap USB cable in half and measure between the red and black
wires, this is a near-perfect 5V supply

 limor

On 8/7/07, Alwyn Lloyd <zarquin at ucc.asn.au> wrote:
>
>
> > Does anyone know how I can figure out which to trust?
>
> you could try making a simple circuit with a power diode in forward bias
> mode in series with a resistor.
>
> you should be able to mesure a 0.7v drop across the power diode.
>
> make sure you choose a sensible sized resistor to match your voltage
> source.
>
> [zar]
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