AR D70 regulator 335VDC doesn´t work
Hallo ! Please help with advice ! Powertransistor TIP 41
seems OK when I measured out of the unit ( desoldered ). But
the correct value , 327VDC from the emitter , is too high now, actually the same as the collectorvoltage . Shall I suspect the OP amp ? ( TLo71 ) . The powerzener (24 VDC )
has only 20,6 VDC over itself . I have 338 VDC on coll. of TIP 41 , 326,1 VDC on pin 3 ( OP ) , 318,1 VDC on pin 4 ( OP ),
and finally 322,2 VDC on the base of D40k1 ! Q2 should be choked , right ? How can Q2 be fully "ON " ? I´m puzzled !!!
Thanks for some advice , explaination ..... Stewen
seems OK when I measured out of the unit ( desoldered ). But
the correct value , 327VDC from the emitter , is too high now, actually the same as the collectorvoltage . Shall I suspect the OP amp ? ( TLo71 ) . The powerzener (24 VDC )
has only 20,6 VDC over itself . I have 338 VDC on coll. of TIP 41 , 326,1 VDC on pin 3 ( OP ) , 318,1 VDC on pin 4 ( OP ),
and finally 322,2 VDC on the base of D40k1 ! Q2 should be choked , right ? How can Q2 be fully "ON " ? I´m puzzled !!!
Thanks for some advice , explaination ..... Stewen
0 responses Add your response