LM317 output to 0v

22,098

Description

As you may recall the LM317 regulator is adjustable from 1.25 to about 35v. By adding 2 diodes you can drop the voltage slightly, about 0.6v of a voltage drop across each diode, so in the schematic below you can get close to 0v

Schematic

LM317 to 0v
LM317 to 0v

Parts List

QTY  PART-REFS           VALUE
---  ---------           -----
Resistors
---------
1    R1                  220R
Capacitors
----------
2    C1,C3               100nF
1    C2                  100uF
1    C4                  10uF
Integrated Circuits
-------------------
1    U1                  LM317T
Diodes
------
2    D1,D2               1N4004
Miscellaneous
-------------
1    RV1                 5k

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