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F5 class AB mode?
F5 class AB mode?
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Old 20th February 2019, 08:56 PM   #11
Russellc is offline Russellc  United States
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F5 class AB mode?
AB100 Class AB Power Amplifier

Do this?

Russellc
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Old 22nd February 2019, 08:02 AM   #12
OnAudio is offline OnAudio
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Thanks Zen Mod

Does this imply you can hear the difference between a switching mosfet and one that’s not switching

That comes to the issue of a particular signature associated with the amplifying device. So we can say mosfet signature , tube signature, nutube signature, bipolar signature , jfet signature, SIT signature etc

Would you say mosfets sound good only with class A operation or when switched at frequencies outside the audio range such as in class D ? Have you ever fancied any class AB amplifier with mosfet outputs ? Have you build any of these 2DIFFET amplifier , POC amplifier , SF Amplifier ? Note the last two are not fully tested but were designed for experimentation.

Would you say the forte of class AB is the BJT? which happens to be risky in class A due to heat.

What would you say about SITs ?

Quote:
Originally Posted by Zen Mod View Post
I believe people tried

I tried it years ago , but difference (to full A class ) was too much for my liking

of course - if you're satisfied , who can argue ?
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Last edited by OnAudio; 22nd February 2019 at 08:05 AM.
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Old 22nd February 2019, 08:08 AM   #13
indra1 is online now indra1  Indonesia
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Quote:
Originally Posted by OnAudio View Post
...What would you say about SITs ?
If you think you need of a bit more grunt, get the Sissy one.
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Old 22nd February 2019, 08:15 AM   #14
Zen Mod is offline Zen Mod  Serbia
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F5 class AB mode?
Quote:
Originally Posted by OnAudio View Post
Thanks Zen Mod

Does this imply you can hear the difference between a switching mosfet and one thatís not switching

That comes to the issue of a particular signature associated with the amplifying device. So we can say mosfet signature , tube signature, nutube signature, bipolar signature , jfet signature, SIT signature etc

Would you say mosfets sound good only with class A operation or when switched at frequencies outside the audio range such as in class D ? Have you ever fancied any class AB amplifier with mosfet outputs ? Have you build any of these 2DIFFET amplifier , POC amplifier , SF Amplifier ? Note the last two are not fully tested but were designed for experimentation.

Would you say the forte of class AB is the BJT? which happens to be risky in class A due to heat.

What would you say about SITs ?

old farts don't think too much



just one thing - THD spectra is main thing which is differentiating amplifiers

besides that - good amp is good amp ...... you can make one from snails , if you are able ..... and it'll be good as any other good one
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Old 23rd February 2019, 07:08 AM   #15
brian.goodman is offline brian.goodman  Canada
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Default Mosfet Citation 12 - Pass AB Design

The Mosfet Citation 12 is worth consideration for your project given your parts constraints. It is a Pass AB design - low parts count, compact board available from Ingvar Ahlberg for the complementary version, article at PassDiy, lots of posts about it on the Pass forum.

Regards,

Brian
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