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Simplistic Mosfet HV Shunt Regs
Simplistic Mosfet HV Shunt Regs
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Old 29th September 2011, 01:39 PM   #2041
regal is offline regal  United States
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Quote:
Originally Posted by Salas View Post
High harmonic content, both odd and even, without signal even.
Ocsilation is the only explaination that makes sense.

Well with no signal, I don't see the high harmonic content. And with an easy load I don't even at 1V out, the tougher load I do but only as I increase the volume to give ~.5V across the 32ohm load on the secondary..


So with the lower load as I increase the grid ac input I am pushing the tube into oscillation or the SSHV into oscillation ?
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Old 29th September 2011, 01:51 PM   #2042
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
I would be investigating a higher bias point for that load first.
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Old 9th October 2011, 12:27 PM   #2043
mogliaa is offline mogliaa  United Kingdom
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Simplistic Mosfet HV Shunt Regs
Hi Salas,
Hope things are ok at your end. I'm in the process of building a 26 pre-amp. My current HT raw supply delivers about 305V at no load and sag down to 210V at 45mA roughly. The supply impedance is about 2K1. My current CLCLC filter smooths the ripple down to 12mV (rms) which is great.

My pre-amps needs 170V and consumes about 7mA per channel. based on your design, I set the shunt current to 40mA. From the simulation it seems that the circuit can regulate fine with the 40V difference. The HT may sag a bit more in practice, so may end up with a 30V difference or so. Will this be OK?

At the moment I used the IRFP9240 but I'm planning to use the FQP3P50 PMOS, but couldn't find the spice model for this....

Thanks for the help
Cheers,
Ale
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File Type: png salas HT Shunt for 26 preamp.png (46.3 KB, 625 views)
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Old 9th October 2011, 04:39 PM   #2044
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Hi, fine here, trying to make ends meet, bootstrapping etc.

Use an IRF9610 for CCS duty, will have better PSRR in HF than FQP3P50 due to far less Ciss. 30V drop across the reg will be plenty to regulate well.
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Old 9th October 2011, 06:29 PM   #2045
mogliaa is offline mogliaa  United Kingdom
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Simplistic Mosfet HV Shunt Regs
Hi Salas, thanks. Well, have the FQP3P50 at hand so will try them...
Will report results soon!
Thanks, Ale
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Old 11th October 2011, 09:17 AM   #2046
merlin el mago is offline merlin el mago
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Any news about SSHV2?

Quote:
Originally Posted by Salas View Post
Sure, I have shown schematic in the past. As in the other regs. SSHV2 will have as standard, if proven it mixes well. But I will have to go visit a friend that has #26 and horn speakers, and tweak there, compare SSHV installed already, gather opinion etc. Want to keep it comparably low parts count with gains in frequency etc. with no further stages, to can practically give better subjective impression also. A juggling act on trying to surely practically improve on a so widely liked and used circuit, not easy.
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Old 11th October 2011, 10:58 AM   #2047
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
I finalized what I want to test but the test meeting with Vgeorge got postponed.
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Old 11th October 2011, 11:27 AM   #2048
massimo is offline massimo  Italy
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I finalized what I want to test but the test meeting with Vgeorge got postponed.
No ferry to Poros due to strikes?

P.S. Going to keep my promise
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Old 12th October 2011, 12:17 AM   #2049
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
No, its just his car got bumped when just about to meet up.
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Old 15th October 2011, 08:10 PM   #2050
merlin el mago is offline merlin el mago
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Question Remote sense

This schematic with remote sense is correct?
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File Type: gif SSHVOPT.gif (8.8 KB, 1124 views)
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