How to Build a Bench-Top Power Supply

Step 8 Moment of Truth

Plug the wall-wart in and flip the switch. If smoke pours out of the voltage regulator, you got something wrong. If nothing happens, things are probably in your favor. Hook up your multimeter and test the voltage. Make sure the potentiometer can adjust the voltage. If everything checks out, congratulations! You're ready to start a long life of powering circuits.

Comments

[tim127]

instead of useing a heatsink do you think i could use a computer fan for everything?

[thestyrofoampeanut]

 i built it exactly as you did and when i hook it up to my multimeter it says my min voltage is 0V and my max is 6V
in fact, i ca put it on full power and it wont blow an LED
help?

[twitsl]

 If you used a different power regulator that would have done it as well as using a different resistor value and maybe your wall adapter may have been six volts.Check those and if those don't solve it i have no clue what to do.

[thestyrofoampeanut]

 everythin checks out so i just put a less powerful pot on and now i can get more voltage

[edgard409]

Could you make me 3 of these I would pay you for the costs of the supplies and the shipping.

[codex653]

is this an ac or dc power supply??

[stanum887]

in my opinion this project this is an AC to DC power supply... the wall wart is some kinda same as the cellphone charger which gives minimum of 5V and 800mA. this project makes it broader by controling the output of the syste which chargers not suitable of... this is a great project for electronics with a range of 5-12v and 800mA input.. the supply of power is changable... that explains it

[jules15]

dc

[fresh-nes]

(in my opinion) it's a DC power supply !