You could, but a 7805 will use fewer parts. 5V supplies tend to be all about the current, and you'll only need about a 16V cap, so make it a big one!So the new parts on the shopping list include (3) lm337's and (3) 2n2955's right? If I use the 8vac coil to make a 5vdc regulated supply I have some DF01m 100prv, 1a (4-pin DIP) FW bridge rectifiers I could use for it. What size filter caps should I use on it? And could I use another lm317 to regulate it?
Im not sure how to measure it. I have a really good dmm and a velleman o-scope... The transformer came out of a Marantz power amplifier so im sure it will give me the 4a I want.. If I have enough equipment to measure it, And you give me an idea how to I would be happy to do it. Ive wondered this myself.What is the current rating on each of the secondary windings?
I believe I have a 7805 in my parts box.. Got an example circuit for it?You could, but a 7805 will use fewer parts. 5V supplies tend to be all about the current, and you'll only need about a 16V cap, so make it a big one!
that's the circuit I went off of except I added the extra 2 of each regulator like the schematic I posted in post #1 to add more current capabilities. I would like to have 4a available. from the datasheets ive read a single lm317 or lm337 ill only be able to get 1.5a.. if theres an easier way im willing to change it all.. that's why I posted it is to get everything right before I build it.I would scrap your circuit for starters - too complicated.
We began with a basic +ve and -ve unregulated power supply design.
The next step is to add +ve and -ve adjustable regulators.
TO3 posted a simple circuit using LM317 and LM337 in post #32. That is a good starting point until you figure out the amperage of your windings.
Right on.... Ill have some current measurements from my transformer sometime tomorrow. Then I guess we will know exactly what I have to work with.. thanks again.. I just want a nice reliable adjustable power supply with some current...that's all.. But I want the experience of figuring it out and building it myself...Yes, but let's tackle one thing at a time.
by Aaron Carman
by Duane Benson
by Jake Hertz
by Aaron Carman