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TIP29 in my Bride of Zen
TIP29 in my Bride of Zen
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Old 7th June 2004, 01:10 AM   #1
arold19 is offline arold19
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Default TIP29 in my Bride of Zen

Hello, I just want to talk about something in my Bride of Zen amplifier power supply.
At the output of my 30-30v transformer, I have 95Vdc, so, at the output of the regulator, I have 60v. My TIP29 have to burn 35V!
After a couple of minutes, My TIP29 is very very hot, It is imposible to touch it, it is to hot. I have a little heat sink on it, like the one on my mosfet....

I see two solution:

1- Use a bigger heat sink.
I don't want to do that because it will be physically difficult

2-Put a power resistor between the 95v and the Collector of the transistor.
To that, I need to have the current draw of the preamp, I'm not sure about this, maybe 100mA ?
If that, the resistor will be 35/0.1=350 ohm ???

Thank you !
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Old 7th June 2004, 02:24 AM   #2
jh6you is offline jh6you
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Another solution could be reducing the bias from about 40mA to about 30mA, by adjusting R108i.e. V across R108/R108 = 30mA. I have tried with 30mA with a still good sound.
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Old 7th June 2004, 07:05 AM   #3
jh6you is offline jh6you
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Further to post#2...

The reduction of the bias could be possible simply by adjusting P102 till the voltage across R108 reaches about 3V. If so, this method does not require any addition, deletion or change of component.

Good luck.
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Old 7th June 2004, 02:48 PM   #4
Henrik is offline Henrik  Denmark
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arnold19

Take a look at this post and the discussion around.

http://www.diyaudio.com/forums/showt...804#post285804

Regards
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Old 7th June 2004, 02:55 PM   #5
jan.didden is offline jan.didden  Europe
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Default Re: TIP29 in my Bride of Zen

Quote:
Originally posted by arold19
Hello, I just want to talk about something in my Bride of Zen amplifier power supply.
At the output of my 30-30v transformer, I have 95Vdc, so, at the output of the regulator, I have 60v. My TIP29 have to burn 35V!
After a couple of minutes, My TIP29 is very very hot, It is imposible to touch it, it is to hot. I have a little heat sink on it, like the one on my mosfet....

I see two solution:

1- Use a bigger heat sink.
I don't want to do that because it will be physically difficult

2-Put a power resistor between the 95v and the Collector of the transistor.
To that, I need to have the current draw of the preamp, I'm not sure about this, maybe 100mA ?
If that, the resistor will be 35/0.1=350 ohm ???

Thank you !


If you have 95VDC from your 30-30V transformer, I suggest that is the real problem. (I assume you rectify the two 30V secs in series with a bridge). Maybe you should get another transformer, for the pre-amp this would not be too expensive?

Jan Didden
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Old 8th June 2004, 06:11 PM   #6
Anorgan is offline Anorgan  Croatia
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This are my heatsinks. Tip doesn't get hot - it's warm. That 5W resistor gets hot
So see for yourself if you have a smaller heatsink or something is wrong with yours (i remember you had some trouble with it).
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File Type: jpg boz_2.jpg (78.3 KB, 262 views)
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Old 18th June 2004, 10:11 PM   #7
arold19 is offline arold19
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Default picture

Here the picture of my preamp. He can see the little heat sink on my tip29 in the bottom at the right of the pic...
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File Type: jpg preamp3petit.jpg (44.7 KB, 176 views)
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Old 18th June 2004, 10:14 PM   #8
arold19 is offline arold19
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Default more picture

Here more picture of my preamp!
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File Type: jpg preamp2petit.jpg (36.4 KB, 160 views)
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Old 18th June 2004, 10:16 PM   #9
arold19 is offline arold19
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one more
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Old 18th June 2004, 10:17 PM   #10
arold19 is offline arold19
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the last
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