[ARC5] What's a Transformer - II

[Scott Robinson]

I suspect that teh transformer secondary is supposed to be used this way:


your config    my suggested config

0                    55V

9V                    I dunno

33V                20V

55V                CT

75V                20V

107v                55V


With bridges and cap input filters. this gives 55*1.4=+/-77V DC and 
20*1.4=+/-28VDC

I don't know what the 9V tap is for.


FWIW<


Scott


On 7/5/18 6:24 PM, Robert Eleazer wrote:
> I hooked up the transformer I got for the young guy who did not know 
> what it was.  It is quite different from any I have seen in a piece of 
> consumer electronics.
> Hooking up 120VAC to the primary, I found that the secondary has 
> multiple taps in series.  Putting the multimeter lead on the first two 
> gives 9V, the 1st and 3rd give 33V, then next there is 55V, 75V, and 
> so on up to 107VAC at the other end.
> Suitably mounted and equipped with switches, this could be a step by 
> step isolation transformer, perhaps good for older equipment designed 
> to work on 110 VAC as well as for gradually powering up equipment 
> where you are worried about the capacitors.  Based on the 700W peak 
> rating of the audio amp it powered, it should be good for 3 or 4 amps.
> Wayne
> WB5WSV
>
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