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LME49830 in TINA
LME49830 in TINA
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Old 4th March 2019, 09:19 PM   #11
kees52 is offline kees52  Netherlands
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Just see good that the Vbe transistor in on one side reversed, it is on the negatove side of circlotron.

best is build it and test, I can not get it to work, only without bias.

regards
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Old 4th March 2019, 09:36 PM   #12
kees52 is offline kees52  Netherlands
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Wel I have see into the model.

see the pic, bias is in model terminated, and as such not usable.

I need a model with bias, strange that this is terminated.

regards
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Old 5th March 2019, 08:27 AM   #13
UltimateX86 is offline UltimateX86  France
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LME49830 in TINA
texas did not give anything else

LME49830 | Mid/High-Power Class D Amplifiers | Audio | Tools & software
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Old 5th March 2019, 09:13 AM   #14
UltimateX86 is offline UltimateX86  France
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LME49830 in TINA
I just ordered 4 * ECW20N20-S

http://www.exicon.info/PDFs/ecw20n20.pdf
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Old 5th March 2019, 12:01 PM   #15
UltimateX86 is offline UltimateX86  France
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LME49830 in TINA
apart from the circlotron scheme, I've never seen that LM with lateral fet use vbe multiplier


The_Wire_LME_Lateral_FET_Amp Wiki

Quote:
There is no thermal bias compensation required, and no emitter resistors needed thanks to the lateral mosfets.
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Old 5th March 2019, 12:04 PM   #16
kees52 is offline kees52  Netherlands
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For lateral fet you need none, for irfp240 you need one, that is why we did try vertcals. But for these fets, do check if these has gate protection diodes otherwise put on yourselfs.

I have looked on the lme chip itselfs, the outputs are currend source loaded where the bias resides, in circlotron we use just one side, x 2 for the other one, if the idle voltage do not cancel out, we can set bias idle.

Laterals sound much better in mine eyes, I have try this some time ago.

regards
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Last edited by kees52; 5th March 2019 at 12:25 PM.
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Old 5th March 2019, 02:20 PM   #17
kees52 is offline kees52  Netherlands
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And with post 16 driver you can nicely steer this compound output circlotron.

it as 2 x amplification factor, with local feedback you can make some nice stuff.

output pic is 1 x version, feedback resistors can be adjusted, you need 2 watt resistors here, or even more.
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File Type: jpg ScreenHunter_2110 Mar. 05 16.17.jpg (423.8 KB, 79 views)

Last edited by kees52; 5th March 2019 at 02:22 PM.
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Old 5th March 2019, 02:34 PM   #18
UltimateX86 is offline UltimateX86  France
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LME49830 in TINA
Nice output stage, i already try to simulate a compound in this schematic, but no result :

http://circlotron.audio/data/simulat...otron_1.1A.asc
http://circlotron.audio/data/simulat...otron_1.1A.png

moreover I still have not succeeded in replacing RB by a bias system
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Old 5th March 2019, 05:57 PM   #19
Mooly is offline Mooly  United Kingdom
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Moved to Solid State forum.
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Old 5th March 2019, 08:17 PM   #20
kees52 is offline kees52  Netherlands
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Quote:
Originally Posted by UltimateX86 View Post
Nice output stage, i already try to simulate a compound in this schematic, but no result :

http://circlotron.audio/data/simulat...otron_1.1A.asc
http://circlotron.audio/data/simulat...otron_1.1A.png

moreover I still have not succeeded in replacing RB by a bias system
Do work in it.

the bias can be done with a current source ? for output I have put them in, see .asc voltage will be swapped on N or a P mosfet, bias is then close to two, otherwise it has to be negative or positive, can be done with current source who is temp sensor also>?.

Have no other work, maybe look at it later.

regards
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File Type: asc bjt_circlotron_1.1A.asc (10.7 KB, 3 views)
File Type: asc bjt_circlotron_1.1B.asc (10.7 KB, 1 views)
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