I am fiddling with developing 1.2 V to 30 V DC power supply using LM350/Lm317, circuity being same whether one uses either IC.With the transformer(12-0-12) 220 t0 12 V ac, I get converted 34 V dc. I am using fix resistance of value 222 between Iadj and Vout reducing maximum Vout to 30 V. I am using 5K pot between Iadj and earth. The circuit works fine for both IC with a curious observation- As POT resistance goes down, a stage comes for both ICs, when Vout goes on increasing! If I use transformer to get 220 to 12 v ac( actually, with the transformer I got I get 17 Vac!) and reducing to 15 v Dc as input for both ICs, the above observation doesn't hold. Why so? Can any expert find a reason for this curious observation?
I checked my POT and it is working OK.
I am using circuit given in data sheet of LM350/LM317.
sureshparanjape
I checked my POT and it is working OK.
I am using circuit given in data sheet of LM350/LM317.
sureshparanjape