MJH11018... are they useful for anything? - diyAudio
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Old 1st January 2014, 02:21 PM   #1
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Default MJH11018... are they useful for anything?

I'm a newb and this probably a stupid question, I have about 30+ MJH11018 that I salvaged, out of all things an ultrasound machine.

I want to know if there is a simple project I can use them for to get my feet wet with? Also the board they are installed on are still has heat sinks and isolators that I can re-use as well.
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Old 1st January 2014, 03:13 PM   #2
fpitas is offline fpitas  United States
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Not a dumb question at all, but this may be the wrong forum. This one is for IC amplifiers. Try the Solid State forum:

Solid State - diyAudio

Those transistors are pretty slow by modern standards (OK, glacially slow), so you probably won't get great performance. You might still have fun, though.
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Old 1st January 2014, 03:42 PM   #3
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When you say slow, are you saying it would be bad for a high frequencies, but good for a sub amplifier? Or are you referring to something else?
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Old 1st January 2014, 04:02 PM   #4
fpitas is offline fpitas  United States
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I suppose they might be good for a sub amplifier. The low ft isn't a problem per se for the high frequencies, so much as attaining a decent amount of loop gain in the feedback network at high frequencies without having stability problems.
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Old 1st January 2014, 04:41 PM   #5
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Not entirely sure what that mean, but thank you. I'm just going to keep reading over old threads and try to pick up as much as I can.
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Old 1st January 2014, 04:54 PM   #6
fpitas is offline fpitas  United States
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You might pick up a smattering of feedback control theory here, but nothing beats a good book if you want to understand it in depth. Amazon has a good assortment at reasonable prices; just search on 'feedback control theory' and pick one that's appropriate to your mathematical background.
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