Hi everyone. I am a beginner electronics enthusiast and I am currently working on a regulated dc power supply. I am building it IAW a book I am reading called "Tab Electronics Guide to Understanding Electricity and Electronics". The power supply construction has gone very well and I thought I was about done when I ran into the problem I am having now. The power supply is built to provide positive and negative regulated dc power. I built the "positive" side of the circuit and everything worked as designed, so I mirrored the "negative" circuit from this, which is also what the book instructed to do. My issue is that the negative side of my power supply is not adjustable. I am getting -37vdc no matter what position P2 is in. I rechecked all my wiring and verified that no solder points were shorted across and everything was wired to where it needed to go. I also verified my transistors and potentiometer read out correctly with my DVM. What am I missing here? Thanks for any help. I have included the schematic I build my circuit off of. I can provide pics of the circuit card itself but I doubt it will be of much help because of all the wiring hiding the PCB.
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