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Chip Amps Amplifiers based on integrated circuits

LM1875 layout
LM1875 layout
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Old 23rd November 2017, 05:13 PM   #11
phase is offline phase  United States
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I was just wondering how that works with the tiny heat sinks!
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Old 23rd November 2017, 05:16 PM   #12
sevenup2278 is offline sevenup2278  Netherlands
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Quote:
Originally Posted by scottjoplin View Post
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.
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Old 23rd November 2017, 05:31 PM   #13
scottjoplin is offline scottjoplin  Wales
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Ah, I see, apologies
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Old 23rd November 2017, 06:43 PM   #14
nenad88 is offline nenad88
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I understand his reaction, he cant see other side of pcb. So it must be shocking seeing that heatsinks. I dont think those regulators need heatsinks at all.
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Old 23rd November 2017, 06:54 PM   #15
nenad88 is offline nenad88
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[IMG]Click the image to open in full size.LM1875 amplifier V2 by Michael van den Born, on Flickr[/IMG]
I like his amps so much.
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Old 2nd December 2017, 12:17 AM   #16
nigelwright7557 is online now nigelwright7557  United Kingdom
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Strange marking of smoothing caps polarity.
Is the big thick line -ve or +ve ?
A simple "+" marking would have been more obvious.
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Old 2nd December 2017, 12:19 AM   #17
rayma is offline rayma  United States
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Quote:
Originally Posted by nigelwright7557 View Post
Strange marking of smoothing caps polarity.
Is the big thick line -ve or +ve ?
That's standard for the negative terminal these days.
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Old 2nd December 2017, 01:49 AM   #18
PRR is offline PRR  United States
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Quote:
Originally Posted by rayma View Post
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.
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Old 4th December 2017, 06:58 PM   #19
nenad88 is offline nenad88
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Found this on one other thread:

It is sch for this pcb with opamp.

Click the image to open in full size.

Last edited by nenad88; 4th December 2017 at 07:21 PM.
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Old 4th December 2017, 07:11 PM   #20
scottjoplin is offline scottjoplin  Wales
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Quote:
Originally Posted by PRR View Post
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 )
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