I need help building an adjustable power supply! What it will be powered off of is 120v AC power and put to a computer powersupply with some resisters and capasitors and a little magic it will have a knob
to adjust the current output!
now, here is a link to the diagram!
article describing what I want to do:
http://www.slotside.com/tt/power.html
electronic blueprint
http://www.slotside.com/tt/powera.html
I bought the stuff from radio shack, not sure if I got the write stuff below is a list of the parts that I bought
272-1016 Electrolytic Capacitor 100uf (qty 1)
276-1778 lm317t Postive adjustable volage regulator (qty 1)
271-1311 100 ohm resistors 1/4 watt 5% tolerance (pkg of 5)
271-1321 1k ohm resistors 1/4 watt 5% tolerance (pkg of 5)
from tigerdirect I got a 300watt powersupply for 20$, all in all I spent 40$ on this, I got some misc. stuff like aligator clips and wire and all that stuff, to so it would look like one of those NICE 400$ units talked about on the website.
My questions are as follows, where it says ampmeter and voltmeter are those digital (analog) read outs with a knob, or are they without knobs and do I have to add my own knob to control the voltage going them? Where do I add the knob and does anyone know what I need to do without blowing up a 200$ electric motor? I would be using this to power not just small slot car motors, but big stuff also, so I might be adding female power end to it so I can plug stuff in. This would be used for breaking in slot car motors primarly.
Please I really need help..
Thanks,
~PCT