Author Topic: Im finally a dependent  (Read 1701 times)

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Seven64

Im finally a dependent
« on: April 25, 2012, 09:01:34 AM »
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


rousejeremy

Re: Im finally a dependent
« Reply #1 on: April 25, 2012, 09:21:43 AM »
You got all the text in there on your first try? Awesome!
Consistency is a worthy adversary

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Seven64

Re: Im finally a dependent
« Reply #2 on: April 25, 2012, 09:23:41 AM »
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!

Mark Hammer

Re: Im finally a dependent
« Reply #3 on: April 25, 2012, 10:46:07 AM »
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.

Seven64

Re: Re: Im finally a dependent
« Reply #4 on: April 25, 2012, 11:33:20 AM »
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

Mark Hammer

Re: Im finally a dependent
« Reply #5 on: April 25, 2012, 02:27:08 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.

crazy8

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Re: Im finally a dependent
« Reply #6 on: May 02, 2012, 05:47:50 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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