robb wrote:
"John Popelish" wrote in message
. ..
robb wrote
This is the my 1st SMT pcb etching project board.
Is there anything horribly wrong with the layout of the
components and/or traces ?
The IC looks like a quad opamp. I would put its bypass
capacitor as close to the chip as possible. It appears that
C1 and C2 in series perform this function. I think I would
bring the trance to pin 11 up under the chip and put C1 and
C2 closer to it.

I am also concerned that it looks like you have loaded the
output of one of the opamps directly with capacitors, which
tends to make them oscillate. And one opamp looks dangling.
Usually a bad idea. Maybe we should look at the
schematic, also.

Why are R9 through 12 arranges as they are
Regards,John Popelish

Thanks for the reply and help John.

I have made some modifications and i have added a schematic image
along with the pcb,


Hmm, first reply went into the weeds.

Still no bypass cap close by. This is not a super-fast opamp but it is
isn't slow enough to go sans cap. C1/C2 are a bit far away. Also,
driving the center of C1/C2 directly can cause some grief. Most opamps
do not like to have a large capacitive load and may oscillate.

Hint: To make your circuits more understandable draw them with the
individual opamp sections separated, not all in one big block. Else
you'll sit there a few years later "What on earth does this part here do?"

Pins 1 and 2 are connected in the layout but not on the schematic ...

--
Regards, Joerg

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