Hi Richard=20 Just a thought about rewinding an existing transformer for a regulated powe= r supply application, or any application for that matter. It is important t= o make sure that your new amp turns do not exceed the transformer core capa= bility. If you drive the core into saturation by exceeding the maximum magn= etizing current, several effects happen that are not good. The transformer = gets hot, the voltage/ turns ratio does not hold up and nasty waveform dist= ortion happens. If the transformer is feeding a diode rectifier/ capacitor = input stage, as in your power supply, then the peak current drawn by the re= servoir capacitor at maximum output current drawn by the load will be very = high. When transformer saturation kicks in, the voltage collapses at the cu= rrent peaks and those nasty drop outs appear at the regulator input, and th= us at the output. Worth doing a few calcs first.=20 Sent from my iPhone > On Apr 21, 2014, at 5:48 AM, "Richard R. Pope" w= rote: >=20 > Hello all, > It works!! I'm able to adjust the power supply from 1.5 to 18.5=20 > volts. This is just what I am looking for. Later on I will add an over=20 > current crowbar to the power supply. I am happy with it as it is for=20 > right now. Since this power supply came with 8 2N3055s for the output=20 > transistors and it uses a 2N3055 to drive the output transistors, it was= =20 > hard to come up a compatible drive circuit. I finally used 3 2N3904s to=20 > drive the 2N3055 drive transistor. > Thanks, > rich! >=20 > --=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 --=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 .