[sdiy] Weird Ripple Voltage

[mike ruberto]

It seems there's nothing wrong with the transistor itself. It turned
out to be the wrong transistor. Apparently somebody replaced the part
at some point with what they thought was a viable cross reference. But
the compatibility just wasn't right.

I haven't done anything beyond the simplest of tests but it looks like
a perfectly good transistor.

Mike

On Sun, Apr 6, 2008 at 7:32 AM, Roy J. Tellason <rtellason at verizon.net> wrote:
> On Sunday 06 April 2008 00:04, mike ruberto wrote:
>  > Got it! I case I missed something I started working my way back into
>  > the power supply from the rectifier and noticed a very large spike on
>  > the base of a pass transistor. Changed the transistor and problem
>  > solved.
>  >
>  > Very strange, because the output voltages were correct with the faulty
>  > transistor. This turned out to be an interesting challenge. Learned a
>  > little something about snubber circuits because of it too.
>  >
>  > Mike
>
>  Do you know what the problem was with the transistor?
>
>
>
>  --
>  Member of the toughest, meanest, deadliest, most unrelenting -- and
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>  -
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>  M Dakin
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