>On Monday 06 May 2002 23:50, Jeffrey Madore wrote:
>> Thank you, gentlemen, for your responses re my questions pertaining to the
>> suitability of a transformer with a 106 Ohm secondary at 5300 volts and a
>> 120 volt primary. BTW I rechecked the primary resistance and it appears to
>> be about 0.1 Ohms + - .
>>
>> My next question is, what would be considered a decent secondary resistance
>> at that voltage?
>>
>> Actually that voltage is a bit high. What if I used a full wave ct
>> rectifier scheme? Then the voltage would be about half and the secondary
>> resistance would also be 1/2. Would a 53 ohm secondary be considered
>> suitable for a 1500 watt amp?
>>
>> Since I have access to all the winding leads, what if I paralleled the
>> secondary windings and used a bridge rectifier? Now the secondary
>> resistance would be about 26 Ohms.
>It's worth searching out the Duncan Amps web site and downloading their PSU
>designer software. It's very informative to get an idea of the peak and rms
>currents in any situation - rms especially where you are looking at
>transformer/capacitor heating. You get a good indication of regulation too.
>
>Long ago, I read something that warned against simply paralleling
>transformer
>secondary windings because of the risk of odd effects if the voltages were
>not equal. Since then, at high power (whatever the volts/amps), I've always
>used separate rectifiers on each secondary. Is this over cautious?
>
No, it's good engineering practice, Steve.
- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
www.vcnet.com/measures.
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