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 Forum index » DIY Hardware and Software » The layout factory
Buffers Ahoy!
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bubzy



Joined: Oct 27, 2010
Posts: 535
Location: United Kingdom
Audio files: 50

PostPosted: Sat Dec 24, 2011 3:06 am    Post subject: Buffers Ahoy! Reply with quote  Mark this post and the followings unread

just a simple utility board 12/15v.
8 buffers, 4 inverters.
please check before etching(i guessed at inverter resistor values, might be necessary to put 100k's or higher in)?
(i am excellent at making mistakes:P)

File is ExpressPCB format,if theres enough interest ill put a pdf up with pcb layout

thanks for looking

Bubzy


buffers.zip
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SBA.zip
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Last edited by bubzy on Sat Dec 24, 2011 4:21 pm; edited 1 time in total
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LFLab



Joined: Dec 17, 2009
Posts: 180
Location: Rosmalen, Netherlands

PostPosted: Sat Dec 24, 2011 9:24 am    Post subject: Reply with quote  Mark this post and the followings unread

Sounds interesting, don't use ExpressPCB myself, so a PDF would be most welcome.
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bubzy



Joined: Oct 27, 2010
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PostPosted: Sun Dec 25, 2011 12:47 am    Post subject: Reply with quote  Mark this post and the followings unread

here ya go Very Happy
(added to first post)
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LFLab



Joined: Dec 17, 2009
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Location: Rosmalen, Netherlands

PostPosted: Sun Dec 25, 2011 2:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

Looks great, think i'll etch one in the next couple of days. Do think i'll put the ground somewhere on the bottom copper, just run it around. Nothing else on top otherwise, great layout nice n compact. Thanks!
By the way, do you have a schematic?
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bubzy



Joined: Oct 27, 2010
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PostPosted: Sun Dec 25, 2011 6:19 pm    Post subject: Reply with quote  Mark this post and the followings unread

nope sorry, dont have one. tbh though its so simple i think you can draw one up from the pcb in about 5 minutes Very Happy
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LFLab



Joined: Dec 17, 2009
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Location: Rosmalen, Netherlands

PostPosted: Mon Dec 26, 2011 5:21 am    Post subject: Reply with quote  Mark this post and the followings unread

Took the liberty of rerouting the GND to bottom copper, this will allow people to use SMD caps close to the opamps, when using crankier stuff than TL074 (and even with those). Also added the option to use output resistors.

On a more important note, Doepfer standard has the marker near the bottom, which is -V (and marked with a red stripe on the cable). I've moved the marker in the layout. If you are using boxed headers, this will mean the notch is inward towards the pcb rather than the more commonly used outward direction.

I believe, but I'm not sure, ASys is the other way around, be careful anyway.


Oct buffer PCB copy.pdf
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bubzy



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PostPosted: Mon Dec 26, 2011 5:58 am    Post subject: Reply with quote  Mark this post and the followings unread

nice work Smile i guess i was too lazy to make the +v and -v tracks smaller. hope you get some use out of this Smile
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bubzy



Joined: Oct 27, 2010
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PostPosted: Thu Dec 29, 2011 4:35 am    Post subject: Reply with quote  Mark this post and the followings unread

JarnoBassplayer wrote:
On a more important note, Doepfer standard has the marker near the bottom, which is -V (and marked with a red stripe on the cable). I've moved the marker in the layout. If you are using boxed headers, this will mean the notch is inward towards the pcb rather than the more commonly used outward direction.



heh, i didn't realise this, i've been using pin 1 as +v in all my designs (not copying any standards, just seemed to make sense :p)
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LFLab



Joined: Dec 17, 2009
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Location: Rosmalen, Netherlands

PostPosted: Thu Dec 29, 2011 11:05 am    Post subject: Reply with quote  Mark this post and the followings unread

well, right angle headers are reversed so if you're using these, you still are abiding eurorack law! Laughing
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