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Auto-Biasing Circuits for Complementary Followers
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Old 8th January 2018, 05:42 PM   #11
Nelson Pass is offline Nelson Pass  United States
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Auto-Biasing Circuits for Complementary Followers
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Originally Posted by marconi118 View Post
what about the TL431 method of F4 BA?
That is biasing with a constant voltage reference. I think we have been
talking about bias circuits that adjust themselves.
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Old 8th January 2018, 06:02 PM   #12
Bare is offline Bare  Canada
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What opens .asc files ?
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Old 8th January 2018, 06:11 PM   #13
Dennis Hui is offline Dennis Hui  Canada
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Auto-Biasing Circuits for Complementary Followers
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What opens .asc files ?
LTSpice
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Old 8th January 2018, 06:15 PM   #14
indra1 is offline indra1  Indonesia
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One of the most troublesome of current sensing aspect is the unavoidable addition of a resistor right in the path where usually resistance as small as possible is preferred.
Since price of hall effect sensors are quite affordable and will only add mili Ω for sensing eg. 0.65 mΩ for ACS723. With all the talk and effort on low PSU resistance and elimination of source degeneration I think they offer a good alternative for autobias circuits. I have not seen anybody refer to them here in Papaland. Are they any good? Is there a catch we need to be aware of? Anybody interested in having a discussion on them here, or better on the beast thread?
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Old 8th January 2018, 06:27 PM   #15
Zen Mod is online now Zen Mod  Serbia
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Auto-Biasing Circuits for Complementary Followers
better to make solar bike than amp , with those



I'm all ears ...... in other thread , maybe dedicated one ?
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Old 8th January 2018, 06:55 PM   #16
indra1 is offline indra1  Indonesia
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I was hoping El Primo Honcho does not object discussion of autobias using Hall Effect sensor here.
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Old 8th January 2018, 07:12 PM   #17
cbdb is offline cbdb  Canada
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Since the optocoupler only senses positive current Dosnt the bias change with signal?
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Old 8th January 2018, 08:34 PM   #18
indra1 is offline indra1  Indonesia
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As an example, the ACS723 can be used to replace source resistor of M2 output stage. Comments?
Attached Images
File Type: gif ZMM2SEFHEHPASC.gif (52.8 KB, 363 views)
Attached Files
File Type: asc ZM M2SEF Hall Effect HPA.asc (5.2 KB, 24 views)
File Type: zip ACS723xx.zip (2.7 KB, 25 views)
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Old 8th January 2018, 08:37 PM   #19
Zen Mod is online now Zen Mod  Serbia
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great indra!

you earned year long tab for drinks in Da Pub

will check tonight , hopefully
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Old 8th January 2018, 10:18 PM   #20
wayne is offline wayne  United States
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Since the optocoupler only senses positive current Dosnt the bias change with signal?
No if the bias is high enough like in the DIY headphone amp. You also have big caps around the opto and Nelson has some other tricks.
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