0-5V Breadboard Power Supply

[burg]

Hey,

I'm looking for a quick solution. I'm testing circuits on a breadboard and I've run into the problem where I don't have a power supply.

I want to make something to plug into the wall, if possible. Is there anything out there like that?

Thanks for the help!

 

[sam2]

Theres lots using the LM317. **broken link removed**
Go down to power supplies, and the schematics are there to look at. Check out 402,403.
If you have an old computer power supply laying around, you can just hook up your power supply to it ,and not have to worry about digging up a transformer.

Sam

 

[stevez]

If your voltage and current requirements permit you might try a wall wart followed by an adjustable or fixed regulator. You'll need to come in with 3 volts more than your max output. Place the regulator on a small board close to the breadboard with capacitors to eliminate noise. The wall wart keeps you from having to fool with higher voltages. I've seen some with outputs approaching 1 amp.

 

[Hero999]

The LM317 won't go down to 0V, the minimum is 1.25V. However 0V is possible given some tweaking.

I havent built this circuit but it should work.
https://www.electro-tech-online.com/attachments/0v-to-15v-lm317-pdf.9790/

 

[Blueteeth]

This works for me, but its only 3.3v or 5v, but it can be modified to provide a voltage anywhere in between those two:

https://www.sparkfun.com/commerce/product_info.php?products_id=114

Cheap as well,

Blueteeth

 

[burg]

That small 3.3V/5V one looks pretty nice.

I've found some stuff about using an old ATX power supply, by taking it apart and using the 5V, 12V and 3.3V rails. Thing I'm wondering is that it supplies high voltage, so will that be a problem?

Thanks for the ideas!