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Old 4th July 2013, 05:26 PM   #821
borys is offline borys  Poland
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Quote:
Originally Posted by jkuetemann View Post
Don't get me wrong here, I'm not suggesting that the dual die Exicons would be the preferred device, just that it could be a pretty capable little beast with them. To the contrary, I'm still very much on board with the original concept.

There was some very early interest in paralleled devices and it seems perhaps a logical step to take. Also, the idea of using a bootstrap arrangement can make the amp a little more voltage efficient.

I'll post my current idea shortly.
I have made the bootstrapped version already, I used 1k resistor and 100uF cap (47uF should be fine too). It sound really OK.
I found that double bootstrap separated with diode is increasing slightly thd (measurements done on fet-hex thred), better version would be standart with two high power rated (3W-5W) resistors, than we should have some extra heat but unchanged thd.
Attached Images
File Type: png boot26.png (117.0 KB, 326 views)
File Type: png boot25.png (111.9 KB, 310 views)
File Type: png boot24.png (125.4 KB, 308 views)
File Type: png boot21.png (136.6 KB, 301 views)
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Old 4th July 2013, 05:54 PM   #822
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I not often bougth heatsink as i have good rubish findings

My Nmos 200 : each heatsink mesure 230x200x40mm with 10mm base plate rated 0.4K/W and have 6 more

Click the image to open in full size.

My NBip : each heatsink mesure 265x150x75mm with more than 10mm base plate rated around 0.2-0.25K/W and have 3 more

Click the image to open in full size.

I have found some more others :

- 5u 300x75x40mm rated 0.45K/W
- 3u 300x120x40mm rated 0.4K/W
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Old 4th July 2013, 06:09 PM   #823
PMI is offline PMI  United States
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@Idefixes: anytime you can recycle anything and keep it out of the landfill, it is a win in my book!

The first version of my chassis was made almost completely with parts from the scrap bucket at a local machine shop, although I DID have to buy the heatsinks...

The next couple I have to pay for, since finding identical scrap parts is hard (chuckle). I plan to make around six similar to that one, and perhaps standard width, with the same heatsinks from Heatsink USA, one of the companies that is supporting us with their advertising here..

Btw, Heatsink USA does advertise that they will machine parts to order.
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Old 4th July 2013, 06:28 PM   #824
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I couldn't resolve to let this pieces go to destruction, last day i found 5u of 195x150x25mm and couldn't resist to bring them to home....the issus is that house basement begin to overfill.....

Marc
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Old 4th July 2013, 09:48 PM   #825
shaan is offline shaan  India
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Default double output



Progress so far:-

Re-aligned some resistors/diodes.
Added larger electro caps for supply decouple.
Added compensation caps.

Now making the silkscreen(see attachment). Is this silk style cool or should I follow some other style?

shaan
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Old 5th July 2013, 01:34 AM   #826
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Hi Dear Shaan...so fascinating...I got 2 boards with 1 pair out put from my best friend Naf...I have couple days running test of them..with bds they need zobel..
I am so curious to try this 2 out put pairs version...
Many thanks for your good design...
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Old 5th July 2013, 03:12 AM   #827
naf is offline naf  Indonesia
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Quote:
Originally Posted by shaan View Post


Progress so far:-

Re-aligned some resistors/diodes.
Added larger electro caps for supply decouple.
Added compensation caps.

Now making the silkscreen(see attachment). Is this silk style cool or should I follow some other style?

shaan
hi Shaan, it's nice layout with big elco supply i'll use panasonic fc 1000uf/50v.
if 10uf mkp/mkt will be used for input, i think it's too small pattern.
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Old 5th July 2013, 06:46 AM   #828
borys is offline borys  Poland
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Quote:
Originally Posted by shaan View Post


Progress so far:-

Re-aligned some resistors/diodes.
Added larger electro caps for supply decouple.
Added compensation caps.

Now making the silkscreen(see attachment). Is this silk style cool or should I follow some other style?

shaan
Looks cool.

My 2cents - if you are using multiple pairs of outputs I would recommend source resistors anyway, and by adding only 3 small elements per rail you are getting around 35W more - from the same psu.
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Old 5th July 2013, 08:23 AM   #829
shaan is offline shaan  India
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Quote:
Originally Posted by naf View Post
...if 10uf mkp/mkt will be used for input, i think it's too small pattern.
What is the lead spacing of the MKT?
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Old 5th July 2013, 08:34 AM   #830
khalsa is offline khalsa  India
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shaan very nice design
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