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Old 16th July 2003, 03:56 AM   #1
Tensop is offline Tensop  Lebanon
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Default Gainclone layout check..

I've decided that it would be a bad idea to hijack the other thread, so i've started my own one

this is based on rod ellios design at

http://sound.westhost.com/project19.htm
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Old 16th July 2003, 08:32 AM   #2
Nuuk is offline Nuuk  United Kingdom
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OK Tensop, but what is your question?
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Old 16th July 2003, 01:37 PM   #3
Tensop is offline Tensop  Lebanon
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Sorry nuuk, i wasnt expecting the post to be held in captive in customs because im a new member

Anyway, I was wondering if there are any possible signal problems(such as interference from power rails) or if any ground loops have occoured, as for note the input(pin 10) is actually a bipolar,however expresspcb didnt have bipolar round pronged capacitors
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Old 16th July 2003, 05:29 PM   #4
S.C is offline S.C  United States
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This looks professional, gj and mine looks kinda ghetto. What's the benfit of a wider piece of copper?
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Old 16th July 2003, 06:01 PM   #5
Nuuk is offline Nuuk  United Kingdom
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I'm not really familar enough with this design to comment if there are any problems or not. Which chip are you intending to use with it?
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Old 16th July 2003, 07:16 PM   #6
Tensop is offline Tensop  Lebanon
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Ok, the chip i'm going to use is the lm3886, however this board is compatible with the lm3876(below pin 1 and pin 5 is a set of holes for a jumper to go into to connect both of the v+'s together(required for 3886, according to the docs)
R6 has a .7 microhenry inductor wound around it(enamaled copper winding..), however directly underneath there is a ground plane the negative signal of the opamp(including feedback) is running directly under the inductor. Are you able to see any track placement related problems that could arise if this board was etched and used?
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Old 16th July 2003, 07:19 PM   #7
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Looks like the LM 3876 as per Rod EllioT
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Old 16th July 2003, 07:31 PM   #8
Tensop is offline Tensop  Lebanon
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Quote:
Originally posted by S.C
This looks professional, gj and mine looks kinda ghetto. What's the benfit of a wider piece of copper?

larger track width is required as the current going through the tracks increases, eg. if you were to use 1mm tracks with currents of 80amps going through it.. you would turn the track into a resistor, it will burn continue burning until something breaks the link(eg boom or crack!)
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Old 16th July 2003, 07:32 PM   #9
moamps is offline moamps  Croatia
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Hi,

my suggestion:

- delete track between R4 and R5
- place R6 parallel to R7 (speaker output move to left side of PCB)
- move R5 close to C5
- place track (30mils) between signal ground (pin7, R4,R5, shield of input signal cable ) and power ground (C4,C6,C2,C3)

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Old 16th July 2003, 07:51 PM   #10
Tensop is offline Tensop  Lebanon
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here is my modification, as to moamps recommendation, i also took the liberty of moving C3 and C2 closer to the IC pins as rod elliot recommended.
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