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TSSA - The Simplest Symmetrical Amplifier
TSSA - The Simplest Symmetrical Amplifier
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Old 3rd December 2012, 03:24 PM   #1371
Samuel Jayaraj is offline Samuel Jayaraj  India
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Other than the TLP627, I have everything in my large parts collection; JFETs are similar, eg., 2N5461 instead of 5462. So will a PDF of the track pattern be made available please? Thanks.
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Old 3rd December 2012, 05:07 PM   #1372
Jay is offline Jay  Indonesia
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Originally Posted by Idefixes View Post
TLP627 is opto device remoted by DC detection on OUTput. The whole effect is to shutdown output stage when DC is present.

The design is not fully tested for moment (missing time). Before etching plate are you shure to be able to purchase all matched need transistor in BIGBT module (NPN/PNP and mosfet) but all little and middle transistors too in first stage?

Marc
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Old 3rd December 2012, 06:44 PM   #1373
Idefixes is offline Idefixes  France
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Originally Posted by Jay View Post
What?
What, What????
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Old 3rd December 2012, 06:47 PM   #1374
Idefixes is offline Idefixes  France
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Originally Posted by Samuel Jayaraj View Post
Other than the TLP627, I have everything in my large parts collection; JFETs are similar, eg., 2N5461 instead of 5462. So will a PDF of the track pattern be made available please? Thanks.
May be in private but at your own risk as i don't want to publish something public that not be tested

Marc
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Old 4th December 2012, 10:04 AM   #1375
Lazy Cat is offline Lazy Cat  Slovenia
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Originally Posted by Samuel Jayaraj View Post
Other than the TLP627, I have everything in my large parts collection; JFETs are similar, eg., 2N5461 instead of 5462. So will a PDF of the track pattern be made available please? Thanks.
Hi Samuel

2N5461 is conditionally acceptable because it could have too low Vgs at demanded CCS current, so cascoded BJT's Vce=Vgs would not have enough headroom to operate properly. I suggest you to use 2N5462 or two 2N5461 in parallel.
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Old 4th December 2012, 12:39 PM   #1376
Samuel Jayaraj is offline Samuel Jayaraj  India
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Originally Posted by Lazy Cat View Post
Hi Samuel

2N5461 is conditionally acceptable because it could have too low Vgs at demanded CCS current, so cascoded BJT's Vce=Vgs would not have enough headroom to operate properly. I suggest you to use 2N5462 or two 2N5461 in parallel.
Thanks for that info. Might as well order for 2N5462 from Element14 (formerly Farnell) as well as all the JFETs required for Sonya's version of the TSSA.
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Old 4th December 2012, 02:32 PM   #1377
sonnya is offline sonnya  Denmark
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Originally Posted by vgeorge View Post
Try to listen with the feedback bypass caps completely removed first.
From stability point of view it is okay as Rf is not alteret.

How do you describe the Sound after some days og use?

What about salas? What do you Think ?
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Old 4th December 2012, 02:43 PM   #1378
Salas is online now Salas  Greece
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TSSA - The Simplest Symmetrical Amplifier
The 200kHZ square waves pics are with no bypasses at all. Not on rails, not on feedback. Perfectly stable. I don't know if the bypasses speed it up more, but with just the FC lytics, I found the -3dB point at circa 2.5MHZ (6 vertical divisions reduced to 4 rough check point).
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Old 4th December 2012, 03:10 PM   #1379
Esperado is offline Esperado  France
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From stability point of view it is okay as Rf is not alteret
I believe it is better that way: a light low pass filter induced by the lytic inductance is better than any ringing.
And, as long open loop bandwidth and slew rate remains unchanged, we don't need zillion htz of closed loop bandwidth.

Last edited by Esperado; 4th December 2012 at 03:15 PM.
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Old 4th December 2012, 03:55 PM   #1380
vgeorge is offline vgeorge  Greece
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From stability point of view it is okay as Rf is not alteret.

How do you describe the Sound after some days og use?

What about salas? What do you Think ?
Sound is really nice, I think the best amp ever listened.
Changed the feedback resistors to 50R from 100R to have a little bit more gain. Seems better on the lower gain but I am not sure. Maybe try with 75R and see.
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