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Old 14th January 2014, 01:29 AM   #3971
BigE is offline BigE  Canada
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I am a rookie -- it's for sure my work. Thanks for the info! I'll go through it and try again.
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Old 15th January 2014, 02:07 AM   #3972
BigE is offline BigE  Canada
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Crippled F4 sim working!!! 16V with R1=1R gives 18W with +/-22V rails.

Must try to show THD....
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Old 15th January 2014, 03:08 AM   #3973
BigE is offline BigE  Canada
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Fourier analysis shows around 2.5% with 10V input at 400 Hz...... Simulation goes unstable at 1K.....?

Does anyone have any ideas? I know, probably me, but..... The voltage around the TL431 was set by swaping P1 and P2 for resistors -- it's DC operating points are darn close to +4 and -4 Volts....+4 going to the resistors connected to the 240's and -4 going to the resistors connected to the 9240s....does that seem reasonable?

Thanks for any help here!
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Old 15th January 2014, 03:13 AM   #3974
BigE is offline BigE  Canada
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Found it... the bias voltages are all over the place.... between 0 and -200 mv for the 9240 and +200mv for the 240's source resistors.

Perhaps the TL431 model is not all that great?
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Old 15th January 2014, 05:07 AM   #3975
Zen Mod is offline Zen Mod  Serbia
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Old 15th January 2014, 02:31 PM   #3976
BigE is offline BigE  Canada
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THANKS! I was just going to look for an LTspice group!
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Old 15th January 2014, 04:28 PM   #3977
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Quote:
Originally Posted by BigE View Post
THANKS! I was just going to look for an LTspice group!
DIYer lhquam has excellent mastery of LTSpice; per his demonstration posts in the F6 Amplifier thread and others.
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Old 17th January 2014, 01:07 AM   #3978
Jay is offline Jay  Indonesia
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Quote:
Originally Posted by BigE View Post
THANKS! I was just going to look for an LTspice group!
I have many times heard recommendation about LTSpice Yahoo group, but I have never joined, because I'm already a senior member of Google group
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Old 26th January 2014, 07:58 PM   #3979
lhquam is offline lhquam  United States
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Who is the moderator for this thread?

I have a large post to make for my completed Curly-F4 packaged in a Store Deluxe 4U chassis. It consists of a John Curl/LSK-Pre based folded-cascode voltage gain stage board which piggybacks on the DIYAudio Store Cviller F4 board.

My post will include schematic, photos, distortion plots, other measurements, and listening experience. Does this belong here or in a new thread?
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Old 26th January 2014, 08:08 PM   #3980
pchw is offline pchw  United States
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Maybe a new wiki under Amplifiers:Pass Labs Amplifiers - diyAudio ?
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