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MagneQuest/Peerless Forum Welcome! Need support, you got it. Or share your ideas and experiences. |
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MagneQuest/Peerless Forum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: RE: First Simulation posted by Gordon Rankin on March 13, 2017 at 16:28:40:
Thanks, Gordon. Several members at diyaudio helped me figure out that the datasheet numbers for, say, plate voltage actually mean plate-to-cathode. So, the 350V operating point actually requires a B+ supply of 435V, which puts 425V on the plate after passing through the 140 ohm primary of the TFA-204, requiring a 1.25K cathode resistor to maintain a 60mA idle current. This combination also results in ~75V on the cathode: 425V-75V = 350v.
So the attached, revised schematic seems to fit the 350V/60mA into 3K operating slot on the WE datasheet.
I've been simming other circuits too, like the Fi Primer 300B, and have been able to come up with a viable power supply based on the resistance across the 300B and the OPT at those voltages (5.8K on the 300B, 1.25K on the cathode, 140R on the OPT = 7190R for the final resistor in PSUD2). It's been cool to see how the results in PSUD2 match the ones I get in LTSpice.
Can't model the power supply for George's amp in PSUD2, though, because his choke is in the ground leg and the software doesn't offer that option. So I think I'll first breadboard a Fi Primer 300B, since it's a little more straightforward, before attempting George's design.
Now that I have a little experience with modeling this stuff, the mathematics in Morgan Jones' book will make more sense, so I've started reading that too.
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Follow Ups
- RE: First Simulation - jdrouin 18:06:45 03/13/17 (0)
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