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Registered Member #1792
Joined: Fri Oct 31 2008, 08:12PM
Location: University of California
Posts: 527
IGBT's probably aren't ideal for direct linear amplification, and based on online discussions I perused, their secondary breakdown may also force you to derate them quite a bit for audio applications: . But if you happened to buy one and do some measurements on it that would be fairly interesting. An IGBT might make for a very high power (somewhat) linear amplifier.
Really a switching amplifier will probably give better performance though, as IGBT's are made to switch. The IGBT you have there doesn't look like it's going to be happy switching terribly quickly, but you want to push as high above 20kHz as you can so that you can cut off your switching waveform without cutting off the audio.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Oh, that's mean!
I have to agree that this IGBT wouldn't be my first choice for an amplifier, though. Maybe if I was stuck on a desert island, and it was the only device I had, and I lost my IPhone horn.
I spotted this on a forum the other day: It's about the simplest amp you could imagine.
Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
In terms of super simple amplifiers, this one has the lowest component count I have ever seen, and the author reckons it 'produces the most purest sound' (although no idea of THD).
I've been meaning to throw it together for fun ever since I found the article, and it's possible it might just do something with an IGBT instead of a MOSFET.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Wow. That just goes to show, given the choice between a simple project and a project that works, the DIY community will pick the simple one every time.
Seriously though, it might actually work with an IGBT. They're more temperature sensitive than lateral FETs, but the design has lots of DC feedback to stabilise the operating point.
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IGBT Amplifier
