I've got LM337 problems too
I've built a multiple power supply for a TDA1541a based CD player which includes 4 positive lm317 tracking preregulator circuits and 2 negative lm337 ones. All the positives are fine but both negative circuits have a voltage drop when applying a load.
Just as I was etching the circuit I realised the lm337 pinouts were wrong so corrected it by attaching the lm337s to small upright boards intending on correcting the main board if I ever get this one to work and decide to etch another.
I've built a multiple power supply for a TDA1541a based CD player which includes 4 positive lm317 tracking preregulator circuits and 2 negative lm337 ones. All the positives are fine but both negative circuits have a voltage drop when applying a load.
Just as I was etching the circuit I realised the lm337 pinouts were wrong so corrected it by attaching the lm337s to small upright boards intending on correcting the main board if I ever get this one to work and decide to etch another.
Attachments
Problem solved, I had less than 2 volts with a 50ma load initially, I remade the board and then got 3.55 volts, I increased the 0.1uh output capacitor to 1 uh with a tantalum and got 4.05 volts, I then did the same with the input capacitor and got 4.15 volts then doubling the output capacitor gave me 4.96 volts the same as without a load.