Circuit diagrams and schematics - Electronic projects

  This is OLD Circuit. Power Supply Regulator 53V, max output 2A by 2N3055, Use part Easy to buy and Very Low Cost. Source : http://www.bonavolta.ch/hobby/en/audio/reg_sup.htm

Wide-output-current-range sources that accommodate a wide supply and temperature range require special consideration. The basic circuit of ( Fig 1) provides IOUT = VREF/RS; typically, VREF is 1.25V for the LM317L family. The LM317LZ is rated for 0 to +125ฐC; for lower temperature ranges, the LM317LBZ could be used (-40 to +150ฐC rating), but it [...]

Panel meter power supply – isolated 9.1V 2-5 mA output from 8-30V input, in pdf format, text in Finnish (pdf file)