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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Re: That '22 mH' choke may have an inductance of 22 mH at 10 KHz, but not at 120 Hz. posted by Dave Cigna on April 21, 2007 at 05:39:16:
>>So, to the real questions: do we want our ps chokes to work at frequencies higher than 120Hz? How much higher? What kind of choke do we need for that?<<Dave asks EXCELLENT questions. I think the answer lies in the particular service placement of a choke. An inductance that's stable up to 500 Hz. rates to be fine in choke I/P or pseudo-choke I/P service. The ripple waveform is or very nearly is a sine wave. Filtering out overtones of the ripple fundamental is not particularly necessary. OTOH, a voltage doubler using LARGE caps. in the stack exhibits a HIGHLY triangular waveform (SMALL conduction angle). The amount of ripple freq. overtones here is substantial and the choke following the doubler stack is the defense against the "hash". The inductance needs to be stable to fairly high freqencies.
Eli D.
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- Re: That '22 mH' choke may have an inductance of 22 mH at 10 KHz, but not at 120 Hz. - Eli Duttman 15:15:04 04/21/07 (0)
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