Adding a fuse to this power supply

[juan_felt]

Hi again,

I'm still working on this schematic, and I'd like to add a fuse to prevent overloads from messing up the voltage regulator or the transfomer. The question is where should I add it and which value to use.

Also, if I wanted to get 12v on the outputs, would a 12V transformer do the job?

Thanks!

[R.G.]

If you use a standard three terminal regulator, the regulator itself internally limits current. This is true for both the 7800 series of regulators and the LM317 family.

You probably should go read "Power Supplies Basics" at geofex.com.

If you plan to use a 12V **AC** transformer, that will make about 15Vdc unless it sags too much. That will be OK for a 12VDC regulator like the 7812 **if** the rectification and filtering are done well.

If you plan to use a wall wart transformer - good. If you plan to use an AC-powered transformer inside your power supply box and wire up the AC power line stuff yourself,

DO NOT TRY THIS UNLESS YOU ALREADY KNOW HOW TO DO IT SAFELY.

YOU COULD KILL YOURSELF, BURN DOWN THE BUILDING, OR KILL SOMEONE WHO HAPPENS TO BE NEAR YOU.

[juan_felt]

Hi R.G.

thanks for the advice! Luckily nobody ended up hurt, neither me or the building! I already built the power supply for 9v, following all the safety measurements. 

About the regulator, will it also protect the transformer?

Also, I tried the power supply so it supplies 12 v, my question is, when I plug a few pedals, will it still deliver that voltage?

Thanks!

[juan_felt]

Sorry, this is the power supply ...

http://www.tonepad.com/getFile.asp?id=111