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Old 13th April 2010, 01:10 PM   #71
Elvee is offline Elvee  Belgium
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I should have made clear that I was looking for very high voltage devices. In this respect, the SJEP170R550 from Semisouth is marginally better than the ST.
For the small to medium power bipolar, I was trying to find something similar to the BUX87, but higher voltage, and more suitable for linear operation.
Thanks for the pointers anyway, the SiC looks promising.
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Old 13th April 2010, 04:15 PM   #72
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I recall to some BjT high voltage types from Shindengen but on the currently website I don't find such types:
Home | SHINDENGEN ELECTRIC MFG.CO.,LTD
perhaps there you will find appropriate types:
Description TRANSISTOR, TRANSISTOR Datasheet search, TRANSISTOR datasheet, TRANSISTOR datasheets, TRANSISTOR data sheets - ALLDATASHEET.COM
the follow is made prefer for switching application (HFX Series):
http://www.datasheetcatalog.org/data...gen/mXrwvs.pdf
but the question is whether it is only suitable for switch applications

There are some other HV BjTs, but except the MJ16018 MJ16018 pdf, MJ16018 description, MJ16018 datasheets, MJ16018 view ::: ALLDATASHEET :::
I don't know types for linear applications:
2SC3996 pdf, 2SC3996 description, 2SC3996 datasheets, 2SC3996 view ::: ALLDATASHEET :::
BUH1215 Datasheet pdf - HIGH VOLTAGE FAST-SWITCHING NPN POWER TRANSISTOR - SGS Thomson Microelectronics
BUY71 pdf, BUY71 description, BUY71 datasheets, BUY71 view ::: ALLDATASHEET :::
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Old 14th April 2010, 07:54 AM   #73
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by post #32 about
Successors for V-FET SONY-Yamaha-TOKIN 2SJ28, 2SJ18/2SK60, 2SJ26/2SK76 and 2SK180
there are informations about various patents concerning SIT's - perhaps also of interest here
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Old 11th May 2011, 10:43 AM   #74
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Quote:
Originally Posted by Elvee View Post
This my final (lab) version, including a latching protection.
I am currently adapting the topology for very high voltage output (>1KVpp).
could you perform a stability test so as an audible test already?
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Old 12th May 2011, 05:00 PM   #75
Elvee is offline Elvee  Belgium
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Here is a plot of the loop gain:
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File Type: gif CircloLoopG.gif (51.6 KB, 710 views)
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Old 27th July 2012, 08:10 PM   #76
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here a solution for a passive phase reverse stage (i. e. with interstage transformer resp. driver transformer instead a totem pole common emitter or emitter follower topology):
F6 Amplifier

Last edited by tiefbassuebertr; 27th July 2012 at 08:13 PM.
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Old 30th July 2012, 07:55 PM   #77
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by tiefbassuebertr View Post
here a solution for a passive phase reverse stage (i. e. with interstage transformer resp. driver transformer instead a totem pole common emitter or emitter follower topology):
F6 Amplifier
It takes me back 40yrs: I remember building such an amplifier, transformer-less output based on AD149's, and at the time I found the sound amazingly good...
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Old 23rd January 2016, 08:21 PM   #78
Preamp is offline Preamp  Germany
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Hi Elvee!

I have this little beast on my todo list for quite some time now and finally got around to route a little layout for it. It is single layer only with thicker tracks suitable for home etching, but still fairly compact with 8x5cm (you get four pieces from a single Euro card ). Would you consider this as suitable for your amp wrt loop area / stability etc.? I've opted for horizontal 5W concrete resistors, since I neither like smaller 2W'ers running too hot, nor those big 5W'ers standing vertical due to mechanical instability. C3 can be either a cheap electrolytic or a foil type like WIMA MKS 2. The double footprints for the MOSFETs are only there for some freedom in mounting, they're not supposed to take two in parallel each! To make some use of the free space between the mounting holes (any amp board absolutely needs mounting holes) I've added some 'perfboard' for some additional botching (like adding an input cap for example), which might come in handy for a lab workhorse lying bare on the workbench...

Your latest version with protection and all the bells and whistles looks interesting, too, but I'd like to start out with the simple one first .

Best regards,
Lasse
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Old 26th June 2016, 02:35 PM   #79
Elvee is offline Elvee  Belgium
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Hi Lasse,

Sorry for the the late response, but this thread fell out of my subscribed threads for some reason, and I have just stumbled on your contribution only now, whilst searching for something else.
Your PCB seems to be very much to be in the spirit of the project: nice clever and compact, and I think it will perform quite adequately.
Depending on the actual MOS type used, the diode string setting the gate voltage and quiescent current may need to be adapted, in length and diode type: zener, schottky or regular, to arrive at an acceptable Iq.
That is one of the main weaknesses of the scheme: find the correct combination with discrete components. Somewhat more finnicky than adjusting a trimmer (but much more stable once it is done)
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