Hi there, Jason. I have used similar circuits in the past without problems. However,=20 I usually have a resistor in series with the base of the first=20 transistor to reduce the chance of oscillation. FWIW - I used to use=20 a single MPSA13 transistor instead of two individual transistors. Do note that the output voltage will vary with temperature. Also note that you have far too little current in the Zener diode. I=20 don't expect it to reach the Zener voltage (it will be low). dwayne At 08:56 AM 4/29/2019, Jason White wrote: >Hello PICLIST, > >In the attached picture I have a schematic of a simple linear >regulator created from a resistor, a zener diode, a capacitor, and a >Darlington pair of 2N2222's > >I'd like to know if anybody has ever experienced instability, >oscillation, or ringing from this style of linear supply? > >The high-gain of the Darlington pair seems ripe for trouble. > >Thanks, >Jason White --=20 Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA 780-489-3199 voice 780-487-6397 fax 888-489-3199 Toll Free www.trinity-electronics.com Custom Electronics Design and Manufacturing --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .