Best possible use for......

jerryo · 19th February 2010, 01:43 PM

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?

Th3 uN1Qu3 · 19th February 2010, 02:32 PM

Um, obviously... An amplifier.

jerryo · 19th February 2010, 06:10 PM

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?

event horizon · 19th February 2010, 06:21 PM

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

wakibaki · 19th February 2010, 06:40 PM

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

EBM_dude · 20th February 2010, 09:29 PM

This idea is intriguing me.... using SLOW transistors for driving subwoofers....

PhaseLockLoopy · 20th February 2010, 09:51 PM

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.

lanchile · 20th February 2010, 09:52 PM

Quote:

Originally Posted by EBM_dude

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?

Th3 uN1Qu3 · 20th February 2010, 10:07 PM

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.

EBM_dude · 20th February 2010, 10:13 PM

Quote:

Originally Posted by lanchile

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.

19th February 2010, 01:43 PM	#1
jerryo diyAudio Member Join Date: Jun 2007	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?

19th February 2010, 06:21 PM	#4
event horizon diyAudio Member Join Date: Feb 2008 Location: East Midlands, England	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 __________________ "Never let your morals prevent you from doing what is right!" Salvor Hardin

20th February 2010, 09:51 PM	#7
PhaseLockLoopy diyAudio Member Join Date: May 2008 Location: On a mushroom	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. __________________ Hum likes to have a nice "Noise to Signal" ratio To "Hum" is to be noticed Quality hum is when it pours out of Electrostatic speakers

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

19th February 2010, 02:32 PM	#2
Th3 uN1Qu3 diyAudio Member Join Date: Feb 2010 Location: Bucharest	Um, obviously... An amplifier.

19th February 2010, 06:10 PM	#3
jerryo diyAudio Member Join Date: Jun 2007	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?

19th February 2010, 06:40 PM	#5
wakibaki Banned Join Date: Jan 2008 Blog Entries: 2	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

20th February 2010, 09:29 PM	#6
EBM_dude diyAudio Member Join Date: Aug 2009 Location: Germany	This idea is intriguing me.... using SLOW transistors for driving subwoofers....

20th February 2010, 10:07 PM	#9
Th3 uN1Qu3 diyAudio Member Join Date: Feb 2010 Location: Bucharest	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.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)