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DIYstompboxes.com  |  DIY Stompboxes  |  Building your own stompbox  |  Im finally a dependent 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: Im finally a dependent  (Read 1421 times)
Seven64
Posts: 482


Im finally a dependent
« on: April 25, 2012, 01:01:34 PM »

Etched my first pcb today.  I need to harness my excitement and take my time drilling but I'm pretty proud of it.  I only had to cut one trace.  I think I need a better printer because it won't go over 300dpi....so the transfer quality kinda sucked.

It's a zombie chorus rg keen layout

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rousejeremy
Posts: 1677


Jeremy Rouse


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Re: Im finally a dependent
« Reply #1 on: April 25, 2012, 01:21:43 PM »

You got all the text in there on your first try? Awesome!
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Consistency is a worthy adversary

www.jeremyrouse.weebly.com
Seven64
Posts: 482


Re: Im finally a dependent
« Reply #2 on: April 25, 2012, 01:23:41 PM »

it was technically my 5th try with this pcb.  i havent taken another shot at it since last july.  I tried to transfer it 4 times, 3 using the magazine method and once using photopaper.  i could never get a good transfer.  i ordered some pnp blue about 6 months ago, but had 1/2 the day off today and decided to give it a shot.  the pnp blue was super easy to transfer!
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Mark Hammer
Posts: 22108


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Re: Im finally a dependent
« Reply #3 on: April 25, 2012, 02:46:07 PM »

You,re gonna need to take a dremel bit or a utility knife to some of those areas and create a bit more of a gutter between traces for "insurance", but all in all, not bad.
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Seven64
Posts: 482


Re: Re: Im finally a dependent
« Reply #4 on: April 25, 2012, 03:33:20 PM »

Yea I was wondering that.  Is there still a link somewhere to your tick fix for this layout?  I have searched everywhere but it seems to be down for me
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Mark Hammer
Posts: 22108


WWW
Re: Im finally a dependent
« Reply #5 on: April 25, 2012, 06:27:08 PM »

Can't find it myself, either, and I'm probably pondering a different solution now, some 10 years later, anyways.

Here's what you ought to do, though.  Make sure you use a low current/power chip for U3.  That could be a TL062, a TL022, or an LM358, among your choices.

You can see a wire jumper situated between R16 and C8 on the parts layout.  That connects up V+ to pin 8 on U3.  Replace that jumper with a low value resistor; anything from 10R to 47R or so.  Run a 1-10uf cap from pin 10 to wherever the nearest ground point is.  Naturally, the + side of the cap goes to pin 8.

That will provide some decoupling and isolation such that when the LFO suddenly draws current to produce a square wave, there will already be some reserve current in that added cap, such that there won't be enough overall current draw to produce a spike in the audio path.  Plus whatever current it does draw will be lowpass filtered by the added RC network.
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crazy8
Posts: 1


C3PO - So vile, they bleeped every word he said.


Re: Im finally a dependent
« Reply #6 on: May 02, 2012, 09:47:50 AM »

Nice board, and 5th try really isn't that bad. Can't make them myself anymore, (shaky hands) makes shredding a little difficult too.  icon_sad (Gotta keep my hobbies). I just get my pcbs from pcb solutions . They don't get upset about my small orders.  icon_lol
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