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NAP-140 Clone Amp Kit on Ebay
NAP-140 Clone Amp Kit on Ebay
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Old 20th May 2019, 08:35 PM   #3921
traderbam is offline traderbam  Europe
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Eva has some good data there. Things have moved on since 2007 and the latest devices are no slouches and can handle stupid over-currents - like over 130A for a 200W device, and extremely high voltages: 650V+. Great for that Back to the Future guitar strum or driving your arc welder.

You don't see a lot of IGBTs used in DIYaudio. Nor have I seen any designs using a discrete mosfet driving a bipolar (either darlington or Szilkai). Have you?

Bear in mind that an IGBT does not work exactly like two separate transistors. It is a highly integrated silicon merger with parasitic bits and pieces. More a Brundlefly than a Brundle + fly. And this makes it highly optimized.
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Old 20th May 2019, 08:53 PM   #3922
Bigun is offline Bigun  Canada
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NAP-140 Clone Amp Kit on Ebay
In this day and age where our tools are multifunctional one could imagine picking up a new welder from Canadian Tire and using it to play the Top 40 at the weekend....
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Old 20th May 2019, 08:56 PM   #3923
traderbam is offline traderbam  Europe
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Heavy metal chart?
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Old 21st May 2019, 02:34 AM   #3924
Ian Finch is online now Ian Finch  Australia
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Quote:
Originally Posted by traderbam View Post
...You don't see a lot of IGBTs used in DIYaudio. Nor have I seen any designs using a discrete mosfet driving a bipolar (either darlington or Szilkai). Have you?
I have no idea whether successful amplifiers were ever made with discrete semis. The fact that IGBTs exist is probably evidence that there were fundamental problems like thermal compensation to deal with and the IGBT was a viable solution for very high current applications - if you needed one.
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Old 21st May 2019, 07:32 AM   #3925
Ruwe is offline Ruwe  Europe
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Very high currents and very low drive currents. Basically, just what is needed to charge the gate capacitance. I doubt that any power inverter nowadays uses other than IGBT output stage.

There was a French company in the early 90s called Micromega. They were in digital and very techie and had IGBT outputs in their amps. I remember some good press in the Revue du son magazine.
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Old Yesterday, 12:04 AM   #3926
Bigun is offline Bigun  Canada
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why wouldn’t they work, afterall we’ve created great amps from highly non-linear devices with poor input impedances at high current and which fail quickly under stress, for years - the BJT
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Old Yesterday, 07:09 AM   #3927
traderbam is offline traderbam  Europe
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With a BJT the Ic is non-linearly related to Vbe but can be linearly related to Ib. So some BJTs can be used for linear current amplification. It requires much more current drive and suffers current droop and secondary breakdown.

With an IGBT the Ic is non-linearly related to Vge and non-linearly related to the integral of Ig, similar to but not the same as a mosfet. Unlike a mosfet they have very low ON resistance and lower parasitic capacitance.
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Old Yesterday, 12:52 PM   #3928
Dave S is offline Dave S  United Kingdom
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I still have a set of Tosh IGBTs for audio.
The main issue with them was the pole splitting effect - as the load impedance drops one of the poles plummets in frequency, making stability an issue in a feedback amp.
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Old Yesterday, 11:03 PM   #3929
Bigun is offline Bigun  Canada
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With a BJT the Ic ... can be linearly related to Ib.
in your dreams maybe
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