More Metronome Musings

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Ray P
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#91 Re: More Metronome Musings

Post by Ray P »

Nick wrote: Mon Feb 27, 2017 1:38 am
Ray P wrote: Tue Feb 14, 2017 9:05 pm No Steve, the zeneers are to protect the current sink devices.

Ray
Out of interest what is the current device that needs protecting? What voltage and current is it working at?
http://tubehifi.websitetoolbox.com/post?id=6416198

That's for the original circuit with one current sink shared by the four 300Bs (and Steve's 25Hz filament version will have the same arrangement). For the DC version, as I have it implemented, there are four current sinks, one per 300B. People are also substituting TL783 devices for the original LM317s to good SQ affect.
Sorry, I couldn't resist!
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Nick
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#92 Re: More Metronome Musings

Post by Nick »

Assuming it's a 300b cathode load I would have thought a depletion mosfet cascade or a c4s would be better and safe against voltage
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Mike H
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#93 Re: More Metronome Musings

Post by Mike H »

Thermionic Idler wrote: Sun Feb 26, 2017 7:47 pm And this morning...
:lol:
 
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
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