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Old 2nd May 2007, 10:56 AM   #1101
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Default Thank you Greg...was good to have you around.


Thanks,

Carlos
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg
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Old 2nd May 2007, 11:00 AM   #1102
Nordic is offline Nordic  South Africa
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Ok I will experiment with the earth wire, but does it have to have the inductor in? I have one ready think it was 1.75mh... was about 26 turns....

Just measured HFE, the output transistors survived the error... 100 on one 94 on other...

The board is a work of art dude...

negative points... very limited range of caps that will fit input cap space... and I think 12mm spaceing between elcos and 100nf caps will allow better selection of low esr caps etc... according to the checks I did...

Very easy to assemble.... I will just run it from the psu of the RAJ board until my components for the proper psu comes in.
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Old 2nd May 2007, 11:23 AM   #1103
Nordic is offline Nordic  South Africa
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Oh and TIP42 with hFE 213 is broken?

Greg, power spades are waay too close to driver heatsinks....
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Old 2nd May 2007, 11:42 AM   #1104
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Hi Nordic,

The ZE wire is just a wire.

The inductor, if you choose to use one, goes between the output and the speaker post.

Stick the bypass caps under the board directly on the cap leads if you use oversize caps (or don't use bypass caps). Actually, putting the caps underneath is better than putting them on top.

regards
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Old 2nd May 2007, 11:43 AM   #1105
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Quote:
Originally posted by Nordic
Oh and TIP42 with hFE 213 is broken?

Greg, power spades are waay too close to driver heatsinks....
What driver heatsinks? You don't need them.
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Old 2nd May 2007, 11:45 AM   #1106
Nordic is offline Nordic  South Africa
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I agree with the placement of bypass... I normally do that... just have blinkers on a.t.m...

Carlos showed pctures saying that drivers need 1 square inch....
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Old 2nd May 2007, 12:04 PM   #1107
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Quote:
Originally posted by Nordic
I agree with the placement of bypass... I normally do that... just have blinkers on a.t.m...

Carlos showed pctures saying that drivers need 1 square inch....
Hi Nordic,

Have a look at the gallery here, no heatsinks on drivers.

http://users.tpg.com.au/users/gerskine/dxamp/

I doubt you will need them, but if you did they would be 25 mm square, this is a metric amp afterall.

If you really want to have heatsinks, don't use the spades, just enlarge a hole and run wire direct. BTW: Heatsinks fit on my prototype with 3 mm to spare.

regards
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Old 2nd May 2007, 12:10 PM   #1108
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Default Yes.... was included to Klaas because he had problems.


He had suspections that the drivers were creating his temperature troubles...he include VBE multiplier and heatsinks.

It is a good idea to include them...i am not using..but i have a very big heatsink...also VBE multiplier.

I have commented with Greg..but i did not asked him to include, and Greg normally moves thing there when i ask him to do.

He is extremelly kind, has a lot of care with those things...a nice partner.

regards,

Carlos
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Old 2nd May 2007, 12:17 PM   #1109
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Default Were is those amplifier with RAJ boards you made Nordic?


I can see you are using the last official board model..... have you dismounted the other ones?

Oh...we will lost the chance to test RAJ boards.

No problems...be happy.

regards,

Carlos
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Old 2nd May 2007, 12:21 PM   #1110
Nordic is offline Nordic  South Africa
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OK, scratched out 6 thinner heatsinks from junkpile... so I can heatsink all the transistors except input ones, which I will go buy now... first get it to work with 2n5401, then try bc640 again... with some legbending...

Thank you guys so much for all the patience... I am realy takeing in lots... and next time I do solidstate won't be so painfull...

PS. I made the VBE multiplier too, which I will use.

No, we will still test RAJ boards... left all components in place as pin spaceing was diffirent... just transplanting transistors.... so far we know the tip42 with 200hfe was broken and the 4r7 resistors were wrong....as soon as my dx plays I promise to investigate again, uncle Charlie.
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