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Chip Amps Amplifiers based on integrated circuits

LM1875 layout
LM1875 layout
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Old 22nd November 2017, 06:29 PM   #1
nenad88 is offline nenad88
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Smile LM1875 layout

Could any1 help diy noob, would this pcb cover basic needs of lm1875 to work properly?
I like this board because it is speaker protection + power filter + both channels on same pcb.
I like that it has center ground point between main capacitors so i can connect all to that center ground.
I see it has c104 close to pins 3 and 5 to prevent oscilation + it has elect. caps near too
Zobel network is there so it is another +.
If any1 could spot some bad spots it would be great to point that out.
Sorry for my english and thanks.



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Old 22nd November 2017, 06:59 PM   #2
scottjoplin is offline scottjoplin  Wales
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Hi, it would probably "cover basic needs" but to see if there are any "bad spots" a schematic would be required. If it's a good layout it's a neat solution for sure
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Old 22nd November 2017, 07:04 PM   #3
nenad88 is offline nenad88
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One thing I spotted is that input ground and common ground are connected. Is it allowed or am I wrong. Here is back side. I dont have schematic sry.

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Old 22nd November 2017, 07:18 PM   #4
scottjoplin is offline scottjoplin  Wales
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Quote:
Originally Posted by nenad88 View Post
One thing I spotted is that input ground and common ground are connected. Is it allowed or am I wrong.
It depends, it can be a problem, if you want to look at a good grounding scheme this is helpful
Attached Files
File Type: pdf Wire_Up (1).pdf (186.8 KB, 97 views)
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Old 22nd November 2017, 07:35 PM   #5
nenad88 is offline nenad88
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In this pdf on that picture i can see that in one point signal return is conected to point between capacitors. Ofc i cant reproduce all from that pdf because i cant make my own pcb and I dont want to make amp point to point way.
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Old 22nd November 2017, 07:42 PM   #6
scottjoplin is offline scottjoplin  Wales
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That's just a pictorial representation of amp wiring. The amplifier is represented by the triangle, like an op amp. Can you see the "hum breaking resistor"? This is between the signal ground and common ground
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Old 22nd November 2017, 07:44 PM   #7
nenad88 is offline nenad88
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Yea I saw it now.
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Old 22nd November 2017, 10:37 PM   #8
adason is offline adason  United States
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Just build it!
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Old 23rd November 2017, 08:22 AM   #9
nenad88 is offline nenad88
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Then there is pcb that combines all that plus preamp.
Click the image to open in full size.LM1875 II PCB by Michael van den Born, on Flickr
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Old 23rd November 2017, 05:42 PM   #10
scottjoplin is offline scottjoplin  Wales
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Don't buy that, rubbish almost nonexistent heatsinks
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