X-Calibre : Hot Rodding Mauro Penasa's LM3886 design - Page 14 - diyAudio
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Old 17th December 2005, 07:44 AM   #131
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Default Dual transformer hook-up

for dual transformers i suggest the following

you should have two transformers with dual secondaries
24-0-24 or 25-0-25, I use 28-0-28 but this is not recommended seeing that it is on the edge of safety.

use one transformer for either negative or just for positive.

hook the one secondary to channel one's possitive side and the other secondary to channel two's possitive input.

do the same for the other transformer and this time hooking it up to the negative of each channel

from the board have a ground wire from each board connecting to the chassis star ground.
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Old 17th December 2005, 09:23 AM   #132
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Default Bom

and finally the BOM
Attached Files
File Type: zip x-bom.zip (3.0 KB, 346 views)
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Old 17th December 2005, 09:48 AM   #133
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Default Re: Copper

Quote:
Originally posted by rudi
Here is the Copper view from the component side

board measures 175 mm x 150 mm

print out on A4
rudi, dumb question here. 175mm X 150mm for each board or both? I presume they are dual mono. Sorry if I am asking a silly question. Not good at this.
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Old 17th December 2005, 09:57 AM   #134
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it is 175 x 150 for dual mono. the centers of the chips are approx 88mm apart, you will see small lines next to the relay and input cap indicating the cutting line, (if you want to cut)

hope this helps.
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Old 17th December 2005, 10:25 AM   #135
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Default Problem on X-copper

I have noticed that C32 were very close to the feedback from the speaker, here is the corrected version. there might be a mistake in production and these two might be bridged. so as precaution i moded it a bit
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File Type: pdf x- correct copper.pdf (61.9 KB, 458 views)
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Old 17th December 2005, 03:34 PM   #136
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Quote:
Originally posted by rudi
it is 175 x 150 for dual mono. the centers of the chips are approx 88mm apart, you will see small lines next to the relay and input cap indicating the cutting line, (if you want to cut)

hope this helps.
rudi, thanks for the reply. OK, will try to give this a shot. Gonna be the first time trying my hand at making a PCB.
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Old 26th August 2007, 01:07 PM   #137
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Default looking for LM3886 chip amp

Hi Rudi,

would you please give me yuor e-mail address?
i want to build a LM3886 power amp...

do you still have that PCB?

i would like to buy one set from you.

thanks,

kenneth
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Old 26th August 2007, 01:30 PM   #138
Nordic is offline Nordic  South Africa
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Last time I spoke with Rudi on the phone, he said he wqas not posting here that often anymore... at the time.. this place was filled with inflated egos

If you want it, try to use the e-mail button under his post... if you get no reply... use the e-mail button below mine.. and I will forward you the address I have for him.
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Old 10th September 2007, 04:08 AM   #139
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I have a few questions regarding this design:

The BOM calls for 1n4007 and the silkscreen calls 1n4001. In this application, is there a functional (or sonic) difference? Any preference?

Also, the BOM specs a JQX-14fc1-c for the relay. I'm a newbie regarding relays, what equivalent parts would replace this part in form, fit, and function? A Mouser available part would be very helpful.

I hope to upload a BOM soon with Mouser sourced parts for the entire board.

Dave
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Old 10th September 2007, 06:37 AM   #140
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Default LM3886 PCB wanted

Dear Nordic,

thanks you for your kind help...but i still not allow to use the e-mail function.
the status as below:


"Sorry but you cannot currently send emails to other members because your account is under moderation. If you are a new user, you will gain full member status after you have made a few posts. "


would you pease give me your direct e-mail address?

thanks,


kenneth
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