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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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obsolete transistor replacement
I've identified a bad transistor in the power supply of an audio component,
circa 1981. It's a 2SB527 PNP transistor... I had a bit of a look around on the net and didn't find any quick easy sources. This transistor's sole function is to convert -26VDC coming off one side of a bridge rectifier to -13 volts. It's wired up as follows, and I apologize for not being more skilled in ascii art or I'd try to draw it. The collector is the -26VDC input. It is connected to ground via a 100uF cap. The emitter is the -13VDC output. It is connected to ground via a 10uF cap. The base is connected to a series 470-ohm resistor, then a parallel 10uF cap (to ground), then a parallel zener diode (to ground), then a 5.6K-ohm resistor, then to the collector. My question is thus: if my downstream components can get by with -15VDC, can I just substitute a 7915 15VDC negative voltage regulator? There are no feedback connections from any other part of my circuit to this transistor, it's output voltage should not vary under normal conditions. And, by freak coincidence, the pinout of the regulator matches my circuit perfectly, it'd be a straight swap and removing a couple of resistors. And perhaps most importantly, I have one. |
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