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TSSA - The Simplest Symmetrical Amplifier
TSSA - The Simplest Symmetrical Amplifier
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Old 30th April 2012, 09:56 AM   #441
sonnya is offline sonnya  Denmark
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Quote:
Originally Posted by Joachim Gerhard View Post
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Old 30th April 2012, 10:38 AM   #442
AndrewT is offline AndrewT  Scotland
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I have not been spending sufficient time following the details this Thread has exposed recently, so out of ignorance on my part, I ask a question.

Do the use of bc550c/560c as the input pairs raise the likely hood or possibility of stability issues?
Could one of each pair be specified to be lower gain and/or lower fT to help with stability?
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Old 30th April 2012, 10:49 AM   #443
Lazy Cat is offline Lazy Cat  Slovenia
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Quote:
Originally Posted by AndrewT View Post
Do the use of bc550c/560c as the input pairs raise the likely hood or possibility of stability issues?
Could one of each pair be specified to be lower gain and/or lower fT to help with stability?
No problem AndrewT

Single transistor pair BC550C/BC560C is rock stable, no instability whatsoever.

Since the wish to improve input pair to have constant power dissipation (cascoded Sziklai) was expressed, it was not tested in practice with TSSA yet. So all useful information of stability and improvement, if any, will be gathered by Gerhard and Sonnya, since they already experienced super simple TSSA from post #1.

Sziklai shouldn't have any instability problems (different with Baxandall) since Vce of input pair have enough headroom to operate in linear conditions, also Ic is almost costant ie. 0,65 mA.
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Old 30th April 2012, 11:10 AM   #444
Joachim Gerhard is offline Joachim Gerhard  Germany
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I use BC327-40 and BC337-40.
The modules are nearly ready for testing.
I will let them sit for an hour and then double check.
I hope to get the amp working today.
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File Type: jpg ssa module 2.jpg (87.9 KB, 442 views)
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Old 30th April 2012, 11:18 AM   #445
sonnya is offline sonnya  Denmark
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Replacement for Exicon and Renesas (except 2sk216 and 2sj79)

Magnatec. ALFET Lateral MOSFETs

TT electronics Semelab Limited - Magnatec Datasheets

They are stocked at Farnell.
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Old 30th April 2012, 11:30 AM   #446
Joachim Gerhard is offline Joachim Gerhard  Germany
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Semelab also makes the Exicons i think.
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Old 30th April 2012, 11:44 AM   #447
AndrewT is offline AndrewT  Scotland
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It appears from the various posts around the Forum, that the loss of one factory to a natural event, took down worldwide production of Lateral Power mosFETs.

This may confirm that all current product is based on the same process and the same manufacturer.

Could this be why Laterals are more expensive than Verticals? No competition.
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Old 30th April 2012, 11:45 AM   #448
Lazy Cat is offline Lazy Cat  Slovenia
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Quote:
Originally Posted by Joachim Gerhard View Post
I use BC327-40 and BC337-40.
The modules are nearly ready for testing.
I will let them sit for an hour and then double check.
I hope to get the amp working today.
Very nice looking modules.

Please do not forget to add 2200 uF/10 V elco from latest update.
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Old 30th April 2012, 12:47 PM   #449
Joachim Gerhard is offline Joachim Gerhard  Germany
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Elkos added...
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Old 30th April 2012, 03:10 PM   #450
Joachim Gerhard is offline Joachim Gerhard  Germany
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modules complete and visually checked
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