bitfoic Posted December 26, 2022 Report Share Posted December 26, 2022 I need to replace a PNP BD140 (BD140 datasheet) as I'm restoring a power supply, however the replacement component has its base directly connected to the V+ via the diode bridge. I'm not sure if this is doable. I assumed the collector or emitter would receive the V+. Powered by an 18-volt source, a 100-volt transistor My suggestion is to connect the transistor "upside down," with the base on top of the pict, biased by some DC from the massive resistor soldered to the two big locations, and the emitter and collector permitting the DC from the power supply to the power amp IC. Quote Link to comment Share on other sites More sharing options...
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