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Old 7th December 2013, 01:43 PM   #1301
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Default How to check an amplifier pcboard

To know, in advance to connect power, if your assemble is correct.

https://www.youtube.com/watch?v=OA02klmMYaA

regards,

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 7th December 2013, 01:43 PM   #1302
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Default Nice amplifier still4given

Remove C38 and it will sound even better.

regards,

Carlos
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Old 7th December 2013, 01:46 PM   #1303
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Default Juan Vargas pcboards for Dx Super A assembled, tested and approved!

https://www.youtube.com/watch?v=CEgK4l0MH8k

regards,

Carlos
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Old 7th December 2013, 02:51 PM   #1304
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Thumbs up Caps removed

I watch the video and I was amaze that just a simple cap can make a difference wow ? I'm right now heating my hot iron to remove them thanks Carlos

by the way yes the leads space has to be update on the boards, I thought you will instal them this way as this image but is good that you saw the detail of the copper that is really close to the edge of the PCB "my bad"
ok caps off, sorry I was removing the caps while writing this jejejejeje




Best Regards
Juan
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Old 7th December 2013, 03:19 PM   #1305
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Default The empty spot, the C38 holes, can be filled

With a resistor...then use 6K8, or 8K2 or 10K or even 12K...then the emptyness will be filled.

regards,

Carlos
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Old 11th January 2014, 09:07 PM   #1306
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Greetings,

I am etching boards as I type this for this amplifier. I understand now not to use the capacitor in position C38 - but should it be left empty or are you saying to put a resistor there?

Are there any other modifications that I should be aware of that folks have implemented?

Thank you!
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Old 12th January 2014, 01:02 PM   #1307
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Default You can left it empty

Some guys are not using high current in stand by mode...they are adjusting to 900 milivolts measured in the rail series resistor (10 ohms).

Some guys have small heatsinks and weak supplies....also some of themare not using Dx Supply to save room inside the enclosure and to save money.... these guys (30%) are adjusting to 90mA each rail at iddle.

regards,

Carlos
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Old 18th January 2014, 09:26 PM   #1308
cjkpkg is offline cjkpkg  United States
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OK I took willy's TO-3 design and managed to get it to a transparency to make a photo etch board pair. This is the first time using positive pre-sensitized boards and I must say it is vastly superior to the old toner transfer method.

Progress so far...Just need to finish stuffing the boards, just the front end transistors and the jumpers, thats about it. I put the TO-3's in there for the photo op...I love me some TO-3 transistors.



Click the image to open in full size.
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Old 19th January 2014, 06:51 AM   #1309
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Default Yes.... a more professional method..much better

toner is to make at home, to amateurs.... and forum is diy.... amateur forum...so...it is nice to the forum.....naturally other processes, more professional ones, results much better.

Congratulations...great job you did.

regards,

Carlos
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Old 19th January 2014, 01:34 PM   #1310
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they do look sexy diy PCB's

Regards
Juan
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