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Old 19th February 2010, 01:43 PM   #1
jerryo is offline jerryo  Isle of Man
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Default Best possible use for......

I have aquired a power supply using 28 x 2N3772 power transistors bolted to two heatsinks which came from a military surplus store on ebay. I took the transistors off as I just wanted the heatsinks for an amp project. If I were to put them back on the heatsinks what could I use them for............any ideas?
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Old 19th February 2010, 02:32 PM   #2
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Um, obviously... An amplifier.
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Old 19th February 2010, 06:10 PM   #3
jerryo is offline jerryo  Isle of Man
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Hey, like wow!............I would never have thought of that.
Duuuh!


Seriously though; any particular amp design that I might look at that could use this number of power transistors?
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Old 19th February 2010, 06:21 PM   #4
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Well, with a 60V rating you'd be restricted to a +/- 30V supply maximum. You could make a high current stereo amplifier for driving low impedance loads. Or if you happened to remove 4 transistors (2 from each heatsink) you could make a pair of bridge amplifiers which could do nearly quadruple the power per channel

The transistors can carry 20A a piece, it just depends on how large the heatsinks are on how much you could dissipate.

They aren't particularly fast transistors, maybe a large subwoofer amp in bridge mode & a single channel but with 6 transistors per side (+/-) & two amps making a bridge.

Leaves you with 4 spares
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Old 19th February 2010, 06:40 PM   #5
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Er, a power supply.

These are quite like 2N3055s, but with a lower gain-bandwidt product, 0.2MHz as compared to 2.5MHz. A bit slow for an audio amp, most people would think.

w
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Old 20th February 2010, 09:29 PM   #6
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This idea is intriguing me.... using SLOW transistors for driving subwoofers....
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Old 20th February 2010, 09:51 PM   #7
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Military generator regulators are common - huge sink with many 3772s could be the back end of a 65Amp regulator. Such regulators are used to smooth out supply to be distributed to complex electronics on instantly deployable systems in the field ...such as mobile radar - rapier guidance - laser targeting - comms etc.
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Old 20th February 2010, 09:52 PM   #8
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Quote:
Originally Posted by EBM_dude View Post
This idea is intriguing me.... using SLOW transistors for driving subwoofers....
why complicate your life? just use the heat sink for your project.you bought it for that reason right?
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Old 20th February 2010, 10:07 PM   #9
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Well you aren't driving ribbon tweeters. And i don't know about you, but around here we still have several pro amps in weekly use, equipped with such transistors. They still do their job just fine.
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Old 20th February 2010, 10:13 PM   #10
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Originally Posted by lanchile View Post
why complicate your life? just use the heat sink for your project.you bought it for that reason right?
Woah, I'm not the thread starter.
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