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Old 26th September 2008, 08:16 PM   #1
Stee is offline Stee  Italy
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Default 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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Old 29th September 2008, 09:35 PM   #2
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Default 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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Old 29th September 2008, 09:41 PM   #3
Stee is offline Stee  Italy
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Default 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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Old 30th September 2008, 08:28 AM   #4
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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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Old 30th September 2008, 03:06 PM   #5
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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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Old 1st October 2008, 08:42 PM   #6
Stee is offline Stee  Italy
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Default 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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Old 2nd October 2008, 04:11 AM   #7
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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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Old 2nd October 2008, 10:48 PM   #8
Stee is offline Stee  Italy
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Default yes sure

or it is possible use a FET buffer for line signal
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