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Old 4th December 2010, 03:00 PM   #1
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Default Amplifier with 2N3055

I was a bit bored and looked over at a disassambled regulated psu that has two 2N3055's in it and thought "i wanna build an amp with that!"

Heres the result after a few hours in simulation:
schematic with sim
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Old 4th December 2010, 03:36 PM   #2
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First thing I noted is with your diff amp degeneration resistors R9, R16.

You have them shorted out, as your distortion text also indicates.

Sandy
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Old 4th December 2010, 05:49 PM   #3
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And now its playing:

http://i.imgur.com/LZPi0.jpg
http://i.imgur.com/SwGJg.jpg

This s the schematic on the board:
http://i.imgur.com/WAVUF.jpg

As im posting this, the amp is blasting music at pretty high volume.
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Old 4th December 2010, 06:29 PM   #4
godfrey is offline godfrey  South Africa
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Quote:
Originally Posted by Tekko View Post
... two 2N3055's ...
So if you want stereo, it'll have to be single-ended class A.
Hehe - look Ma, only 30W dissipation for 2.5 watts output.
Attached Images
File Type: gif a.GIF (9.8 KB, 439 views)
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Old 4th December 2010, 06:36 PM   #5
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If i want to make a stereo version of this, i'll just get more 2N3055's, their dirt cheap.

This heatsink is way undersized anyways, its already HOT!! And this amp runs only 100mA bias.

I have in a box at my old adress a large heatsink with 8 TO3 devices on them, actually 2 but the other one is clean.
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Old 6th December 2010, 12:02 AM   #6
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Update:

The two 2N3055's have been replaced with four 2N3716 on a much bigger heatsink.

However making that work was a chore, it took me half a day and loosing a transformer to find out that one of the 2N3716's had a short from c to b.

However once that transistor was disconnected and replaced, the amp sprung to life.
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Old 6th December 2010, 12:36 AM   #7
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Quote:
Originally Posted by Tekko View Post
Update:

However making that work was a chore, it took me half a day and loosing a transformer to find out that one of the 2N3716's had a short from c to b.
Its worth fusing the secondaries to save the transformer if a short occurrs.

I have missed out the fuses myself before on a test rig,
Next thing I knew the transformer was bubbling due to a short !
Luckily i caught it just in time before the windings all melted together.
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Old 6th December 2010, 12:59 AM   #8
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In my case i dident notice it since the transformer was inside a plastic box down on the floor, when i heard the plastic bobbin bubbling and saw the smoke, it was already too late Secondary had already developed interturn shorts.
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Old 6th December 2010, 01:38 AM   #9
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Pics of prototype:

http://i.imgur.com/gDaaR.jpg
http://i.imgur.com/t8agH.jpg
http://i.imgur.com/aaC9X.jpg

Antithump delay:
http://i.imgur.com/gjs06.jpg
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Old 8th December 2010, 10:17 AM   #10
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Cleaned it up alittle:

http://i.imgur.com/3FFB1.jpg
http://i.imgur.com/rPFhY.jpg
http://i.imgur.com/XV264.jpg
http://i.imgur.com/yyEeC.jpg

Schematic:
http://i.imgur.com/UlYNn.jpg

It works and sounds really good.
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