[0-30 Vdc Stabilized Power Supply]

Ok it works!
I replaced Q2 with TIP31C and Q4 with a new 2N3055.

[0-30 Vdc Stabilized Power Supply]

Sorry I see the TIP32C is PNP I'll have to keep looking

[0-30 Vdc Stabilized Power Supply]

Then Q2 or Q4 leaks. Probably Q2 from being fried.

Measure the output voltage at pin 6 of U2. It is probably negative in its attempt to reduce the output voltage down to normal.

Come to think of it, it was working fine until I exceeded 3A.  The output on pin 6 is 30v to -0.15v.  I couldn't find a TIP31A but I did find a TIP32C 140V 5A 40W will it work the same? 

[0-30 Vdc Stabilized Power Supply]

I noticed that I can only get the 0-30V when I have a load attached to the output. Is this because of the negative supply rail?

It should work fine without a load. What happens without a load?

I get about 15.4v to 30v and the 2N3055 transistor is connected correctly

[0-30 Vdc Stabilized Power Supply]

That's great! ;D
Did you use the original little 2N2219 transistor as Q2? Doesn't it get too hot when the project's output current is high and its voltage is set low?
Did you use the original 24V transformer? Does the project give more than about 25VDC at 3A without ripple?

I did use the original 2N2219 transistor as Q2.  I have a heatsink on it, should I use a diferent transistor?

I used a 24V transformer with 100VA so it can draw more current than I want or need.(I'll have to limit this some how)

I noticed that I can only get the 0-30V when I have a load attached to the output. Is this because of the negative supply rail?

[0-30 Vdc Stabilized Power Supply]

Well I have finished my power supply and it works like a Charm :)

But I would like to add a digital panel meter that requires 5V power supply, does anyone have and good suggestions on how I should go about doing this.

P.S. this is my first project and I'm still learning

[Transformer Question]

I have a transformer with a rating of 120VAC Primary to 24VAC secondary with a VA of 100
Does this mean I will get 4A or 3A?

This is what mean:  100VA / 24V(RMS) = 4.16A    or  100VA / 34V(Pk) = 2.94A

This is for the power supply project 0-30V.  I would appricate any help thanx. 

[0-30 Vdc Stabilized Power Supply]

I am almost finish designing my power supply, However I was only able to get a transformer with a rating 24vdc with 100VA.  So my transformer will be supplying 4A current will this work?