Voltage Stabilizer

This is a voltage stabilizer for bad power supplies or if you want to lower a voltage from a  power supply without adding switching noise from a buck-converter. It behaves like a linear power supply and it has diffrential output plus - gnd - minus. From the potentiometers you can adjust your voltage output. To modify the maximum selectable value or minimum selectable value you must modify R5 and R6 for plus and R12 and R14 for minus. R12 and R5 the lower it is the higher the maximum value is, R6 and R14 the lower it is the lower is the minimum voltage selection. My advice is to play with teh values in a circuit simulator program start from my exact values (input+-50V, output 35 to 48V selectable for both plus and minus). My usage was to reduce the ripple of  avery bad SMPSA from aliexpress for an audio amplifier, it had a ripple of almost 10V, yes 10V, with this stabilizer i managed to bring it down to 0.4V, input is 50V output is 42V.