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Old 13th August 2009, 02:59 AM   #31
Bigun is offline Bigun  Canada
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In a previous life I was looking at SiC for image sensors and high power microwave devices. It's funny stuff, very similar to diamond (people are also making devices from diamond), with huge high field electron mobility (but not so good at low fields), high thermal conductivity and a wide band gap so it's good to high temperatures. In fact you can have an operating transistor that is glowing brightly red-hot at over 600degC !!!

You don't add heatsinks to SiC, you use SiC to make heatsinks

Nelson, I would be very curious as to how they sound - the nature of SiC over the past few years is anything but aimed at the subtleties of audio.
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Old 13th August 2009, 04:58 AM   #32
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The group of DIYers I hosted last weekend liked both examples,
both the little current source represented by the curve I posted
earlier, and the more sophisticated 25 watt SE with feedback.

As you know, I like really simple Class A amplifiers, but at the same
time I want to minimize distortion, so better parts fill a real need.

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Old 20th August 2009, 05:24 AM   #33
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You know, a good application for these devices, seeing as they're only available in a single sex, would be Susan Parker's Zeus amps.

se
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Old 20th August 2009, 06:27 AM   #34
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Quote:
Originally Posted by Steve Eddy View Post
You know, a good application for these devices, seeing as they're only available in a single sex, would be Susan Parker's Zeus amps.
Sure, like any else source follower.
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Old 20th August 2009, 06:30 AM   #35
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Quote:
Originally Posted by Nelson Pass View Post
As you know, I like really simple Class A amplifiers, but at the same
time I want to minimize distortion, ...

Nice to read
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Old 20th August 2009, 07:14 AM   #36
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Well, how can we get them at any price? Discussion otherwise is merely academic, except for papa-type patriarchs. (Not dirting on papa by any stretch of the imagination, but how do us peons get some of these?) If poeple are willing to drop mad money on 300Bs, surely the same can be done here, assuming some sort of distribution channel. What do the Soviets do with these things? They would work very well in oil wells and other nasty places.

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Old 20th August 2009, 09:39 AM   #37
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Ive been looking into these SIC devices and found a company producing them in Japan, they have quite a range. At the moment Im trying to get datasheets pricing and availibity on them then Ill post some info. Preliminary pricing seems to be around $15 for a 20 A device.
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Old 20th August 2009, 02:54 PM   #38
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Originally Posted by homemodder View Post
Ive been looking into these SIC devices and found a company producing them in Japan, they have quite a range. At the moment Im trying to get datasheets pricing and availibity on them then Ill post some info. Preliminary pricing seems to be around $15 for a 20 A device.
That's a lot cheaper than $60.00!
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Old 20th August 2009, 03:02 PM   #39
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Quote:
Originally Posted by Nelson Pass View Post
I have built four different amplifiers with these parts, and they are
quite superior to Mosfets.

Here is an example with one place in an F2 circuit, which is a simple
Common-Source stage with no feedback.

Nelson,

Looking at the data sheet they spec quite low resistance for the gate and quite high gate current. How do I interprete that, it that just the resistance/current to charge up the gate or what? Doesn't look like it. Am I missing something?

jd
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Old 20th August 2009, 03:04 PM   #40
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What do the Soviets do with these things? They would work very well in oil wells and other nasty places.
Like ICBMs.
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