Sums up my point perfectly! If you are unable to do the maths yourself you
shouldn't be in their tinkering! BTW. Multiplying the secondary input AC by
1.414 is a much easier way to remember and I get 35.35V. So yes, BANG!
Cheers,
Andy
On 17/07/2011 23:15, "Ben Stuyts" <ben@stuyts.com> wrote:
>
> On 17 jul 2011, at 16:48, Andrew Jury wrote:
>
>> If you can¹t work this out for yourself then I would be very carefully
>> poking around on the primary side of the mains supply!! However, as long as
>> you promise not to sue anyone if it goes wrong then the 50VA transformer
>> with 2 x 25v secondary windings might be what you are looking for.
>
> Are you sure about the 2 x 25 V? In my schematic there are some caps behind
> the rectifier which are only 35 V. (25 V x sqrt(2) - 0.7 V diode loss = 34.7
> V.) And with less load or over voltage on the input the transformer output
> could be even 10 % or 20 % higher and you would blow the caps.
>
> My guess is you would need only 2 x 16 V, 40..50 VA. Anybody here actually
> measured the output voltage of the transformer?
>
> By the way, if you open up the Polysix, it might make sense to recap the power
> supply board anyway. And make sure to check the battery. But you probably know
> that. :-)
>
> Kind regards,
> Ben
>
>
>
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