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.
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.
It depends, it can be a problem, if you want to look at a good grounding scheme this is helpfulOne thing I spotted is that input ground and common ground are connected. Is it allowed or am I wrong.
Attachments
Then there is pcb that combines all that plus preamp.
LM1875 II PCB by Michael van den Born, on Flickr
LM1875 II PCB by Michael van den Born, on Flickr
Don't buy that, rubbish almost nonexistent heatsinks
Those heatsinks are just for the voltage regulators that supply the opamp. The lm1875's are not mounted yet and will use an external heatsink.
Strange marking of smoothing caps polarity.
Is the big thick line -ve or +ve ?
That's standard for the negative terminal these days.
That's standard for the negative terminal these days.
Has been for 30+ years.
They have a roll of shrink tube with a "- - - - -" stripe to mark the negative leg. Often with a fat stripe so a wrong-way cap will stand-out on quick inspection of board.
I do not know why draftsmen mark "+" and cap makers mark "-". But we should be able to figure it out.
They're in cahoots to trap the unsuspecting novice (childish really )I do not know why draftsmen mark "+" and cap makers mark "-". But we should be able to figure it out.
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