|R1=10Kohm||R8=1.8Kohm 0.5W||Q3=BC303 or BC461|
|R2=1 ohm 5W||R9=3.3Kohm 0.5W||D1….4=Bridge 15A|
|R3=3.9 ohms 1W||RV1=470 ohms pot.||D5=LED RED 5mm|
|R4=6.8Kohm 1W||C1-2-4=4700uF 100V||D6-7=10V 1W Zener|
|R5=390 ohms 1W||C3-5=100nF 250V MKT||D8-9-10=1N4007|
|R6=100Kohm 0.5W||Q1=2N3055 on heatsink||T1=230Vac / 55V 3A|
|R7=1.2Kohm 1W||Q2=BD162 or BD243 or BD543|
- For smaller output voltages of +50 V to the +40 V, the Q1 is hot enough, so that it needs a large heatsink.
- For voltages greater than the +50 V to +70 V, the stabilization is not satisfactory.
Conclusion: ideal output voltage +45 V to +60 V. In circuit diagram, the variable resistor / potensiometer of RV1, is used to vary the output voltage between +40 V to +70 V, but maybe we should replace it with two fixed resistors, when finished setting the desired value. The reason is that with the time change occurs output voltage up to 3V with connected potensiometer.
CAUTION ! The positive output corresponds to the point [ A] and the output of 0V, in [ B], which must not be connected to ground .