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26th September 2008, 07:16 PM
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#1 |
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diyAudio Member
Join Date: Jul 2005
Location: milan
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IGBT Still Alive
ciao
see this project with obsolete GT20D101/201    Rs can be an NPN transistor glued on dissipator (AB1 biasing) +V and -V can be dual 60V gain ratio 20x (R2/R1) --> 5,7 Vpp input (RCA) can be 114 Vpp output RL 6 ohm?
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29th September 2008, 08:35 PM
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#2 |
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diyAudio Member
Join Date: Jan 2006
Location: nea makri athens greece
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is there any thing more
about this ????
114 volt peak to peak ????? am i missing something ???? could please tell me more and also add a complete schematic ??? thank you
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SERVICE ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr |
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29th September 2008, 08:41 PM
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#3 |
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diyAudio Member
Join Date: Jul 2005
Location: milan
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that is complete
hello
Vpp from RCA is 5,7V (RMS is 2V) so if you have a gain of 20X RMS is 40V Vpp is 114V correct?
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30th September 2008, 07:28 AM
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#4 |
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diyAudio Member
Join Date: Sep 2007
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In the UK,
http://cpc.farnell.com/jsp/search/br...questid=484396 now have quite a good range of IGBT devices + other "Audio" semiconductors and caps etc. |
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30th September 2008, 02:06 PM
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#5 |
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diyAudio Member
Join Date: Dec 2006
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this is a trick question, right? this isn't a circuit where the gain is set by a resistor ratio..... and the devices shown aren't IGBT's. and most line level signals are nowhere near 5Vrms.... more like 1.5Vrms......
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1st October 2008, 07:42 PM
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#6 |
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diyAudio Member
Join Date: Jul 2005
Location: milan
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better graphic
there isn't complementary IGBT on the market ( P AND N CH )
1,5V RMS X20 ----> 30V RMS 30V RMS / 6 Ohm load ----> 5 A 5A X 30V ----> 150W RMS good power 
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2nd October 2008, 03:11 AM
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#7 |
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diyAudio Member
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That's a good amount of power,for such a simple circuit.
Just add an op-amp/driver to the front end for some more gain,and it should be fine with 'normal' line-level sources. (you could even wrap GNFB around it,back to the op-amp.) Interesting. 
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2nd October 2008, 09:48 PM
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#8 |
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diyAudio Member
Join Date: Jul 2005
Location: milan
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yes sure
or it is possible use a FET buffer for line signal
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