|View single post by Si.|
|Posted: Sat Mar 16th, 2019 03:49 pm||
|" ... needs power off a 16V AC wallwart/transformer.
Operation seems to depend on having two ( positive and negative ) half-waves.
A nowadays standard wallwart delivers filtered DC, so that may be the explanation "
That was EXACTLY what I was trying to say on the last Page <<< previously.
I don't think Murray confirmed if he was using an A.C. (correct) or D.C. (incorrect) wall-wart ?
If he binned the original U.S. Voltage wall-wart ...
... & then picked up an Aussie one, having D.C. output ...
... YES ! ... That sounded like the problem to me.
Especially since TWO Bachmann controllers BOTH did the 'funny' business ...
... & were very possibly tested, using the same ( D.C. ? ) wall-wart.
The oDd reversing-switch operation, is the give away here, I think.
So come on Murray ... Spill the beans ! ... Show us your wall-wart !!
And yeah ... It ISN'T a straightforward resistance controller, like my swingin' '60s one.
It probably has at least 1 rectifier & 1 transistor inside ...
... as well as the throttle (potentiometer) & forwards/backwards (D.P.D.T. Double Pole Double Throw) switch.
I actually unscrewed my Mates one, about 3 Christmases ago, cos I am a curious *$%&@£ ...
... but can't for the life of me remember what the hell was inside ?
I looked for AGES on The Net for a photo of the 'guts' of one ...
... & surprisingly couldn't find one anywhere.
' Mysterious Moose Mountain ' - 1:35n2 - pt.II
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