Please, can someone explain me how the transistors here reduce the voltage from +40 VDC to +15V in the positive side (upper part of circuit)
These are the voltages observed across different components of the power supply card.
O/P Positive side : + 15.40 O/P Negative side : - 13.79 R1 0.525 VDC R2 0.445 VDC C1 44.6 C2 44.8 R3 14.40 R6 18.16 R4 9.57 R5 12.05 C3 29.40 C4 26.94 ZD1 5.08 ZD2 5.20 R9 10.28 R10 8.48 R11 9.70 R14 7.89 R12 5.65 R13 5.82 R7 4.71 R8 0.536
There is a striking difference between voltage drops across R7 & R8 which are current limiting resistors. Is R7 responcible for TR1 heating up ?
And which is causing difference of O/P voltages on both sides ?