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#4,542
output stage
 

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#4,543
Venar
Very nice and different style.
What are your temp readings top and bottom of the sink, or more importantly, the temps at the area where your outputs bolt to the heat sink?
This kind of configuration makes it difficult to get an even temp on all output devices if your running a high bias?

Regards
David
 
#4,544
thanks awverk
amp hasn't powered up yet
but
thermal consideration took in mind when designing
as you can see output devices are spread as far away as possible between them,and asymmetrically to the heatsink(more near to the bottom as the heat spreading to the top and the output air is colder at the bottom of the heatsink
mosfets will rapidly dissipate heat thanks to keratherm reds
so I think that thermal difference between top and bottom will be minimal
and yes bias is high( first 25W@class A operation)
 
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#4,545
A few pics of my most recent build which is a Colin J Wonfor(Incatech; Magnum;Tellurium Q designer) little class A amp the sound quality of which I am blown away by. The amp was first built with the basic amp board and a single supply for both channels before going dual mono and adding in the regulated tracking power supply which made a very worthwhile lift in sound.This is single ended class A amp which outputs about 14 watts but sounds far more powerful.





And with the tracking p/s.



 
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#4,546
Wow Marra, nice work! It looks great 🙂.

I have just finished headamp number 12 😀. Since I have already so many, this one should be very compact 😉. I bought the unpopulated PCB from Michiel Stegeman at forum.zelfbouwaudio.com (the Dutch equivalent of Diyaudio). Al the SMD parts are soldered with just a regular soldering iron. The complete amplifier is about 9.5 cm (W) x 4 cm (H) x 16 cm (D) in size.

An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.
 
#4,549
redjr said:
Michael - Another very nice looking build. Can we see the inside? 🙂

Rick
Click to expand...

Thanks Rick! Of course 😛

I changed the amplifier today a little bit. At first I implemented a little soldereable fuse internally just before the power switch. However, I thought a fuse holder at the rear would be more conventient.

An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


EDIT: By the way, I've made some movies of a few projects on YouTube 🙂 YouTube videos
 
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#4,555
I applaud your attempt to reduce loop area between the supply rail and the output rail.

Your implementation has left a lot of short lengths where the trace narrows significantly. Current density becomes high.

Can you locally widen the trace and avoid the narrowing?
 
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