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.
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
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
Follow all the
safety precautions when working with mains voltage. Insulate all
connections on the transformer.
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.