Schematics > Power > LM317 VARIABLE POWER SUPPLY
LM317 VARIABLE POWER SUPPLY
Description:
A truly timeless circuit. LM317 is a versatile and highly efficient 1.2-37V
voltage regulator that can provide up to 1.5A of current with a large heat sink.
It's ideal for just about any application. This was my first workbench power
supply and I still use it.
Since LM317 is protected against short-circuit, no fuse is necessary. Thanks
to automatic thermal shutdown, it will turn off if heating excessively. All in
all, a very powerful (and affordable!) package, indeed.
Although LM317 is capable of delivering up to 37V, the circuit pictured here
is limited to 25V for the sake of safety and simplicity. Any higher output
voltage would require additional components and a larger heat sink.
Make sure that the input voltage is at least a couple of Volts higher than
the desired output. It's ok to use a trimmer if you're building a fixed-voltage
supply.
Problems:
Follow all the safety precautions when working with mains voltage. Insulate
all connections on the transformer.
Possible uses:
Variable workbench power supply, fixed-voltage supply... Just about any
possible application when no more than 1.5A is necessary.
Also check the conversation about this project at the community. Post you
questions here.
Also check
this LM317 Calculator
Title: LM317 VARIABLE POWER SUPPLY
Source: www.electronics-lab.com
Published on: 2005-02-03
Reads: 765
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