[ARC5] What's a Transformer - II

[Peter Gottlieb]

Oh, cool, that's gotta be it.  9 volts to be regulated down to +5 for the 
digital sections?



On 7/5/2018 9:58 PM, Scott Robinson wrote:
>
> 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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