Top Ten Worst Transistors - noisy, failure-prone, whatever... and replacements
- Thread starter dlucy
- Start date
More than likely something took it out in the "chain reaction". Possibly a power surge or something. They're normally not troublesome.
actually I chased it as the source of the chain reaction...the consequence was a shorted 3W resistor from rail to ground and a glowing 3W resistor can put holes through things...before they go out themselves. Nasty stuff....
I see the transistor used on signal handling so I guess it will not a a problem there so maybe the problem is circuit specific...
Huh, I've never seen a resistor short..
Huh, I've never seen a resistor short..
Yep, it happens. Drifting way away... happens. Faulty new from modern manufacturers... happens. I guess what I've learned is "trust... but verify. twice."
Oh, I've seen them drift up, and up.... until they go open. But never short to 0 Ohms...
well....I meant the transistor went short...hence closed the circuit between the power rail and ground via a 22ohm 3W resistor ...hoping this simplified description makes more sense
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That makes better sense.well....I meant the transistor went short...hence closed the circuit between the power rail and ground via a 22ohm 3W resistor ...hoping this simplified description makes more sense
Oldsansui441
Super Member
Hi, the BC550C's are still available from Mouser.
Unless you bought 250 pieces before they were discontinued.
spark1
Lunatic Member
Unless you bought 250 pieces before they were discontinued.
I thought we were friends.
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spark1
Lunatic Member
Thank you sir! I searched on bc550, no luck. Added the suffix, and there they were. Poor search skills on my part. Thx again.
atmasphere
Active Member
The 2SC1060 was a TO-220 device that developed intermittents. It was so bad that when I worked at Allied Radio they simply were replaced on sight. The 2SC1061 was the replacement but itself was also dodgy. It seems unlikely that either of these devices would have survived this long but by some crazy chance they did they are properly replaced by the 2SC789.
While troubleshooting another Allied Receiver 490 for intermittent distortion in the left channel power amp, the following replacements seem to work quite well.
I replaced the 2SD92 with 2N3584 temporarily, but the originals turned out to be fine.
I replaced the 2SA497 with a 2N5322. This fixed the intermittent.
I replaced the 2SD92 with 2N3584 temporarily, but the originals turned out to be fine.
I replaced the 2SA497 with a 2N5322. This fixed the intermittent.
have you noticed them going noisy?
