I've built a number of power supplies like the one shown, at least I think I have.
This one doesn't work. The rail voltages are as shown on the diagram. The Tx is 2 x15v.
it's supposed to supply + and - 12v but the negative rail comes out at -20v ish.
At first I thought I'd got a dodgy 7912 so I bought some more and replaced the one in the circuit....same result, -20v
I've double,triple checked the connections because the pin outs on 78 and 79 regs are not the same...all is good.
Can anybody suggest what I'm doing wrong?
power supply - senior moment
#1 power supply - senior moment
There's nowhere you can be that isn't where you're meant to be
#2 Re: power supply - senior moment
Try adding a small load, not sure the reg will work with no current being drawn.
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
#3 Re: power supply - senior moment
thankyou...12.2 and -11.9
There's nowhere you can be that isn't where you're meant to be