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Old 18th April 2007, 02:15 PM   #1
adi81bv is offline adi81bv  Romania
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Question building my first preamp - are the traces ok?

hello

i am building my first preamp. before reply please take in account that i will have more space between the traces, the balance pot will not be on the board and from the buttons to the pots i will use some mechanic - so i know there are some minor aesthetics to make for the pcb. my main questions is the grounding and disposition of the traces for minimal noise.

the pink traces are the ground.

do you think is a good layout for the pcb?

thanks.
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Old 19th April 2007, 01:57 AM   #2
Leolabs is offline Leolabs  Malaysia
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Suggest 'pour' more ground to the empty space.
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Old 19th April 2007, 07:22 AM   #3
impsick is offline impsick  United States
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do you have the schematic for that? and yeah you may as well fill in the black with your ground plane
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Old 19th April 2007, 08:24 AM   #4
adi81bv is offline adi81bv  Romania
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thanks. so i will make the gnd bigger. i was thinking of ground loops or interfering traces, thats why i asked. i am not an experienced builder and want to ask before do it.

i have the schematics, but it is verified with the pcb. the questions are about the pcb traces.

so i will make the gnd bigger and wait for a few more comments.
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Old 19th April 2007, 08:34 AM   #5
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A pcb is not only getting the connections right. It is much more than that. So posting the schematic is a must for better advice.

Gajanan Phadte
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Old 19th April 2007, 08:39 AM   #6
adi81bv is offline adi81bv  Romania
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i know, but the schematic is a well known one. and tested. and i dont want to post it, i think i am not allowed to do that but i do not have money to buy the pcb. so.................... i am trying to do it myself. hope you understand.
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Old 19th April 2007, 08:52 AM   #7
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One thing I can tell u, there are no bypass capacitors across the supplies, near the ics
U need them. Also u need 10fd across each supply, near the entry points.

Better still, place your voltage regulators, preferably LM317 or better, on this pcb, on one end.

Fill the component side empty space with ground plane.

Gajanan Phadte
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Old 19th April 2007, 09:04 AM   #8
adi81bv is offline adi81bv  Romania
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is better to put the power supply for the preamp on the board. and just bring the AC wires from the transformer to the pcb.

about the filling of the empty spaces with ground planes, on the edge i have thin traces, after this the trace can get wider? doest it make sens?

i understand that i am not allowed to make ground loops. if i only get the gnd traces wider is ok?

the bypass caps should be put at at the psu of the preamp, and between each power pin of the ICs and gnd? 100n ceramic are ok for this?
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Old 19th April 2007, 09:07 AM   #9
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It looks like you missed a connection. Pin 8 on the right IC shows no connection to the positive voltage rail.
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Old 19th April 2007, 09:07 AM   #10
adi81bv is offline adi81bv  Romania
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yes i forgot it
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