[NJARC] DC power supply(was mystery radio)

[Rob Flory]

The voltage also depends on whether you have choke or capacitor input.  A choke will lower the peak voltage to something closer to the average value, whereas with capacitor input it will be closer to the peak value unless the capacitor is small.

RF

-----Original Message-----
>From: Harry Klancer <klancer2 at comcast.net>
>Sent: Feb 15, 2006 11:08 AM
>To: New Jersey Antique Radio Club <njarc at mailman.qth.net>
>Subject: Re: [NJARC] Mystery radio
>
>Visit our web site - See http://www.njarc.org
>_______________________________________________
>Steve, Jim and Mike,
>
>Umm. Interesting thread, and I'm really rusty on this, but it seems to me
>that 720 VAC (rms) or, if you flip over alternate peaks, 360 VAC (rms)
>is actually about 360 x 1.414 ~ 509 v (peak). If you lose 50 v to the
>rectifier, you still have about 450 v (peak) or, still assuming full-wave
>rectification, approx. 450 x 0.707 ~ 350 V which should be the effective dc
>value. I am using the peak to rms relationship of a sinusoid here, with the
>0.707 value. If you were doing half-wave rectification, it would be
>450 x 0.5 ~ 225 v. Or I could be wrong, and the factor could be 0.636 which
>is the peak to average value.
>
>I'm not sure about this last part, but I'm confident in the first part about
>the 450 V peak value. So, I don't think we're there yet on the transformer
>question.
>
>Or maybe it's just the result of 40 years of brain rust on this end.
>
>                                                     Harry K
>
>
>
>
>At 2/15/2006 10:31 AM, you wrote:
>>Visit our web site - See http://www.njarc.org
>>_______________________________________________
>>Hi Jim & Mike:
>>
>>Thanks guys...
>>
>>Looks like the numbers are real close..interesting to see the tube sucking up
>>50 volts too...Good math there Jim...I learned something.
>>
>>Mike - you sure put me onto a good reference web site....thanks.
>>
>>Now....how & where can I get these tubes tested???
>>
>>R,
>>Steve
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>
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