An open source layout for LM3886?

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#421
Heh. Yeah. Bob Pease was quite the character. We may have been at National Semiconductor at the same time, but I was in a remote office, so I never got to meet him. One of my first skip-level managers did study under Pease, though. He had some stories to tell. 🙂

Pretty neat PCB. I like that you managed to keep it single-layer. That makes it easy to make using toner transfer (or similar) in a DIY fab.

Tom
 
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#422
It looks like the OP has abandoned this website, as many are running away from, since the end of the pandemic. He can't be reached by PM neither although his last visit was less than 3 months ago. Me too have switched off to present my projects on myYouTube channel and make the PCBs available on PCBWAY including all the Modulus series as ZD-50v8 the modified version of ZD-50 which is the original of Modulus.
Thread 'ZD-50v8~°*~° Adios Modulus' https://www.diyaudio.com/community/threads/zd-50v8-adios-modulus.416616/.
 
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#423
There's no such things as "the original Modulus". I developed the design because a friend of mine made me aware that there was a market need for a well-documented composite power amp. The design is my own. It's certainly not the only composite LM3886-based design out there and it won't be the last. I'm at peace with that. The MyRef design dates back further than the ZD-50 that you point to. The MyRef is another composite LM3886-based power amp.

Your post reads like one of the many, "THAT'S IT!! I'm quitting Facebook!" posts that are, ironically, posted on Facebook. That's your choice, but you don't have to drag this forum down just because you don't like it here. Just move on. Then those of us who value the insights of technically competent people can stick around and further our learning.

It's unfortunate that you have an axe to grind with me because I deliver high-quality, well-documented, and well-supported circuits to the DIY community. I think everybody here are able to view your posts in context and draw their own conclusions from them.

Best of luck with your YouTube channel.

Tom
 
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#424
HAYK said:
It looks like the OP has abandoned this website, as many are running away from, since the end of the pandemic. He can't be reached by PM neither although his last visit was less than 3 months ago. Me too have switched off to present my projects on myYouTube channel and make the PCBs available on PCBWAY including all the Modulus series as ZD-50v8 the modified version of ZD-50 which is the original of Modulus.
Thread 'ZD-50v8~°*~° Adios Modulus' https://www.diyaudio.com/community/threads/zd-50v8-adios-modulus.416616/.
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That's quite interesting. I wanted to read:
https://www.diyaudio.com/community/threads/zd-50v8-adios-modulus.416616/
... but the link doesn't work.
Actually, I wanted to build the original "Modulus", not the derivative. Could you please publish the links to your youtube chanel and the ZD-50 at PCBWAY.
 
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#425
Hi everyone.

I was just wondering if anybody had built this amplifier using both the amplifier PCB and the power supply PCB. I have seen a few examples of people using the amplifier PCB on this forum, though they always seem to use different power supply PCBs.
Is this thread's power supply PCB a good choice or are there better choices about (preferably with gerber files)?

all the best,
Sonny
 
#427
NanoFarad said:
Back to topic, this is my pcb on LM1875 monoblocks. It has multiple options for components. Even SMD on the back side. I never forget to thank my friend who helped me to get these PCBs based on that article.

By the way Tom is a former NatSemi engineer!:innocent: :cheers:
I remember a book authored by Late Robert A. PEASE, I liked his teaching style very much. I liked the way he wrote. He truly was a legend. I learned many things from that book. Unfortunately he left us in a very tragic way.
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Any possible way I can get these pcbs etched, do you have gerber file for these?
 
#429
Hi people,

I'm "brand new" here! I've been poking around diyAudio for a while though.
I've put a few LM3886's projects together, and even though they sound good, the interference/noise is always there and bugs the crap out of me. I guess that is what you get with limited knowledge and chineeeese quality boards.
I finally decided to put together the "open source layout for LM3886". Out of both amp boards assembled, one sounds fantastic, but the other is a different story, sounds really muffled. I quickly checked all the solder but did not notice anything. I'm just wondering if anybody has any ideas, maybe to compare them or something. I've already swapped cables, power supplies and no change.
I'm a beginner, but I think I can check voltages, ohms and basic stuff with a multimeter. All parts purchased from mouser, boards with JLC.

Thanks
Joe
 
#435
9527 said:
非常感谢 00940 的分享，我真的很喜欢这个设计。在农历新年假期期间，我决定自己建造一个。当我在做放大器时，我用 MKP 电容器来代替 C15，因为我家里没有任何 COG 电容器。用于 C15 的 MKP 电容器相当笨重，但幸运的是，它没有堵塞 Lm3886 的螺丝孔。我仍在寻找合适的变压器。
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:cop:Please post in English.

Translation:

Thanks a lot 00940 for sharing, I really like this design. During the Chinese New Year holiday, I decided to build one myself. When I was making the amplifier, I used a MKP capacitor to replace C15 because I didn't have any COG capacitors at home. The MKP capacitor for C15 is quite bulky, but fortunately, it does not block the screw holes of the Lm3886. I am still looking for a suitable transformer.
 
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