Hello, Jasen.
-=> JASEN BETTS wrote to JIM HOLSONBACK <=-

 JH> Transformer still OK - has 15-0-15 VAC at the secondary.

 JB> anything connected to the centre tap?
 JB> (a transformer like that is typically used for a push-pull rectifier)
 JB> (especially if you want about 14V out of it rather than about 30V )

 JH> I'll post diagram later.  There are two small parts there which
 JH> are clearly cooked.  The bulb think looks to be OK.  The secondary
 JH> side just has those two small parts (now blown), the bulb thing,
 JH> and a 4000 mfd capacitor.

OK, here's diagram of the secondary side of the transformer.  I moved
the Center Tap part over to the right, for clarity.  Trafo is 15-0-15
VAC.

SCHEMATIC - "AUTO Stereo Home Adapter - Internal Circuit Breaker
          12-14VDC 3A continuous, 5A switching"


                 +12V  Pos Out                    Neg Out
                           |                          |
                           |                          |
                    'MYSTERY BULB '                   |
                           |        4000 mfd          |
                           |       +     -            |
                           |---------| |--------------|
                           |                          |
                           |                          |
              |-----MP-----|----MP-----|              |
              |                        |              |
              |                        |              |
              |                        |              |
            15VAC                     15VAC         CenterTap


The "MP" are those mystery parts, now both burned up, and completely
into two pieces.  I don't think they could have been 12V 3A bead-shaped
diodes, because they are only about the same size a maybe 1/4 Watt
resistors, and I think this unit was built before the time of
bead-shaped diodes..

I don't understand this circuit at all, but afaict, that "mystery bulb"
is the only thing in there which could possibly be a "rectifier".  I
don't see anything which could be called a 'circuit breaker', unless it
is those two (now blown) mystery parts.

- - -  JimH.

... So easy, a child could do it. Child sold separately.
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