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1- 30 volt center tap transformer, 2- lm7805 voltage regulator, 3- lm741 opamp, 4- 10k potentiometer, 5- .33 microfarad cap, 6- 2n3055. The center tap transformer is used to supply this opamp proper operating voltage or you can use any higher voltage opamp. The opamp gives a fine control over the output, just a pot can be less precise. In no way is this a precision power supply, but it can be handy for testing lots of things. Please remember the program will not always simulate real world conditions, so voltage and current may not be accurate or even close to real world at times.
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