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Old 17th October 2018, 01:15 PM   #10731
Vrystaat is offline Vrystaat  South Africa
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Join Date: Jan 2012
Location: Bloemfontein
Quote:
Originally Posted by macd View Post
Good Day....

Thanks to Sir Apex for the AX20 circuit and a Big thanks to Kandimba for the PCB Layout....

Completed AX20P....see pics attached....

Thanks Sir Apex and Kandimba.....

One question....how much bias current for this circuit???? How do I adjust the bias current??? Here is what I am doing....

I measure with DVM across 0.33R resistor. I use ohms law...V=IR...6.6mV=20mA x 0.33....Is this correct????

Regards,
macd.....

Yip, math is correct !
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Jan
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Old 17th October 2018, 08:21 PM   #10732
HIFI0101 is offline HIFI0101  Bangladesh
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Join Date: Jul 2018
Location: Dhaka
I was thinking if i build the A40 with good caps like nichicon kz and other original good components. What is the price range of comercial amps it can compete with or is diy amp are just a fun thing? :/
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Old 18th October 2018, 06:13 AM   #10733
macd is offline macd  South Africa
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Join Date: Apr 2007
Quote:
Originally Posted by macd View Post
Good Day....

Can someone please guide me to balanced input schematic as I would like to drive amp with mixer with balanced outputs...

Thanks in advance....

Regards,
macd....
Quote:
Originally Posted by apexaudio
Quote:
Originally Posted by macd
Good Day Sir Apex....

Thank's for all your audio designs...I am very grateful...

I've just completed an AX14P and an AX20P amp design, both using Kandimba's PCB layouts... Both amp's have great sounds...

Just one Question... I have a mixer with balance outputs. How do I connect mixer's balance output to input of amplifiers?

Thanks in advance...

Regards,
macd.....
Class D Amp with LM566, LM393 and 2XIRF530
Good Day Sir...

This is what I was looking for...Thanks again...

Just some feedback...I connected my AX20 yesterday with proper speaker and supply. Sound is very nice, but I like AX14 sound more. Better trebles and bass. Tested both AMP's with same setup...same psu, input mixer, speakers.... AX14 my favourite..

Thanks again for all your designs...

Regards,
macd
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Old 18th October 2018, 01:15 PM   #10734
kandimba is offline kandimba  Portugal
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Join Date: Oct 2012
Location: Lisboa
Quote:
Originally Posted by Vrystaat View Post
Yip, math is correct !
If you change R16 1K to 1K5 you may get higer bias, 15mV on R23 .33
Attached Images
File Type: jpg APEX AX20 Schematic.jpg (529.0 KB, 271 views)
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Old 19th October 2018, 01:02 PM   #10735
macd is offline macd  South Africa
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Join Date: Apr 2007
Default Ax20...

Quote:
Originally Posted by kandimba View Post
If you change R16 1K to 1K5 you may get higer bias, 15mV on R23 .33
Thank you Kandimba,

I will test tonight with 1K5 resistor....

Regards,
macd
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Old 19th October 2018, 01:10 PM   #10736
Sunny22g is offline Sunny22g
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Join Date: Nov 2016
Macd can u give layout
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Old 19th October 2018, 01:19 PM   #10737
macd is offline macd  South Africa
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Join Date: Apr 2007
Quote:
Originally Posted by Sunny22g View Post
Macd can u give layout
Hi,

no problem...not my layout, Kandimba did the layout...work's 100%..build as is....you will not be disappointed...lot's of power...

Regards,
macd....
Attached Images
File Type: jpg APEX%20AX20.jpg (529.0 KB, 184 views)
File Type: jpg IMG_20181016_154909.jpg (573.6 KB, 178 views)
File Type: jpg IMG_20181017_091648.jpg (518.1 KB, 168 views)
Attached Files
File Type: pdf Apex AX 20 components (1).pdf (61.0 KB, 58 views)
File Type: pdf Apex AX 20 copper side.pdf (208.2 KB, 51 views)
File Type: pdf Apex AX 20 copper side (mirror).pdf (62.3 KB, 40 views)
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Old 19th October 2018, 10:24 PM   #10738
44250 is offline 44250  Serbia
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it is all about a lot of power all around anyway....
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