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Old 1st August 2005, 01:05 AM   #1
kmj is offline kmj  Sweden
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Default PCB for simple OP-preamp

to keep it short, will this do for a pcb-layout? I have never made a pcb before but i had some time over and parts that were of no use at the moment
the ground from the pot is at the same place as the inputground.
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Old 1st August 2005, 04:04 AM   #2
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Hello kmj

Looks good I think, you could move your 0.1uF on the V+ rail I guess. Put it between the Output L/R resistors and move your Output ground hole a little bit.
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Old 1st August 2005, 07:15 AM   #3
Roushon is offline Roushon  India
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it might be a good idea to make and connect the input ground to the power ground by a thin track, otherwise distortion may get into the input signal.
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Old 1st August 2005, 07:31 PM   #4
kmj is offline kmj  Sweden
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Roushon
So just make the rail between the 0,1uF MKP cap and the inputground thinner then.

tobias_svensk
Just move the cap to the other side of the electrolyte then.
(those yellow things next to the out R and out L text are two VERY big capacitors )

I'll have to test your advice, i put it together this afternoon and it works. However, i get a loud background buzz, like a bad radioreception.
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Old 2nd August 2005, 09:39 AM   #5
Roushon is offline Roushon  India
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make the whole vertical track on the left hand side of the pcb thin.
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Old 2nd August 2005, 06:30 PM   #6
kmj is offline kmj  Sweden
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Will do.
The buzzing is still there and i stumbled on a strange problem.

It still works with the NE5532 op, buzz and all, but not with opa2604.
If i shut the pre down and change op the fuses melt. strange since the opa2604 only need about 5-6mA and the fuse is rated at 125mA-slow and the supply is a regulated 12V.

one shouldn't have any prblem with something as simple as this....
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Old 8th August 2005, 09:07 PM   #7
veteran is offline veteran  Poland
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Several months ago I also designed pcb for single op-amp preamplifier I enclose several pictures. There is also dedicated symmetrical power supply based on LT317/337 regulators.
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Old 8th August 2005, 09:08 PM   #8
veteran is offline veteran  Poland
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Power supply pcb...
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Old 8th August 2005, 09:10 PM   #9
veteran is offline veteran  Poland
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Bottom side of preamplifier pcb.
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