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WTB: Salas low voltage shunt regulator

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AndrewT

R.I.P.
Joined 2004
Does it have to be a Shunt Regulator?

A 317 with the lower resistor replaced by a LED can give 3.3V.

Adjust the current through (and thus the voltage of) the LED by changing the upper resistor value.

I used 100r for ~12mA and the reg puts out 3.31V with input varying from 5.5V to 31V

I don't need to trim my 3.31V must replacing the 100r with 150r or 240r with reduce the LED Vf and thus reduce the regulated output voltage.

Add a second LED for 5V output.
 
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