BluegrassDan

First time designing a PCB - check my work?
« on: August 02, 2019, 04:35:04 AM »
Hey guys,

This is the first PCB I've ever designed. Just curious to have my work checked.

Traces are 60 mil. 240V on B+, total heater current will never be more than 2.9A with four channels.


BluegrassDan

Re: First time designing a PCB - check my work?
« Reply #1 on: August 02, 2019, 04:35:58 AM »
And the schematic...

gyraf

Re: First time designing a PCB - check my work?
« Reply #2 on: August 02, 2019, 06:32:06 AM »
You'll probably want bigger pads for all things heavy..

Jakob E.
..note to self: don't let Harman run your company..

BluegrassDan

Re: First time designing a PCB - check my work?
« Reply #3 on: August 02, 2019, 09:17:46 AM »
Bigger pads for the transformer at bottom left. How about all the other components? Beef them all up, including the resistor pads?

gyraf

Re: First time designing a PCB - check my work?
« Reply #4 on: August 02, 2019, 10:01:00 AM »
yeah, for proto work, it's always nice to have good space to solder onto. And you're not running tight on space there anyway..

Jakob E.
..note to self: don't let Harman run your company..

BluegrassDan

Re: First time designing a PCB - check my work?
« Reply #5 on: August 02, 2019, 11:56:13 AM »
Here's another version. Increased most of the pad sizes to 120 mil. Made the tube pads circular and increased their size for more surface area.

ruffrecords

Re: First time designing a PCB - check my work?
« Reply #6 on: August 02, 2019, 05:20:06 PM »
I am a little concerned about the clearance between the heater traces and the first anode of the bottom tube. I think perhaps you should neck the tracks in this region.

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

BluegrassDan

Re: First time designing a PCB - check my work?
« Reply #7 on: August 02, 2019, 06:07:52 PM »
I am a little concerned about the clearance between the heater traces and the first anode of the bottom tube. I think perhaps you should neck the tracks in this region.

Cheers

Ian

How narrow (mils) can I get away with? I thought about doing some more creative heater routing with vias if necessary.

ruffrecords

Re: First time designing a PCB - check my work?
« Reply #8 on: August 02, 2019, 07:09:03 PM »
How narrow (mils) can I get away with? I thought about doing some more creative heater routing with vias if necessary.

Well it is only 150mA of current. What width are they now?

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

boji

Re: First time designing a PCB - check my work?
« Reply #9 on: August 02, 2019, 07:39:47 PM »
Quote
I am a little concerned about the clearance between the heater traces and the first anode of the bottom tube

+1, but I'm no expert.  Will you have a soldermask on the proto?

Edit: Adding a via would solve the squeeze; have one of them come from the other layer.


BluegrassDan

Re: First time designing a PCB - check my work?
« Reply #10 on: August 03, 2019, 02:01:19 AM »
Well it is only 150mA of current. What width are they now?

Cheers

Ian

All the traces are 60 mil.

Re: First time designing a PCB - check my work?
« Reply #11 on: August 03, 2019, 03:21:28 AM »
you can look at this tool, http://www.saturnpcb.com/pcb_toolkit/

ruffrecords

Re: First time designing a PCB - check my work?
« Reply #12 on: August 03, 2019, 04:27:33 AM »
All the traces are 60 mil.

For signals. 20 mil is plenty. I think you can safely neck those heater traces to 30 mil where they pass between tube pins.

Not wishing to put a spanner in the works but when I have two  like yours sharing a heaters I usually place them on the baord with the heaters facing each other. The way you can have a pair of short fat traces directly between them.

Edit: So you would just need to rotate the bottom one through 180 degrees.

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'


 

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