Here my first try at it I think it came out very well all but the bottom ground.

And with all the parts on the front side. I don't think it to bad for reusing some old copper.

__________________
Burt
http://mybe80be.com
http://stores.shop.ebay.com/mybe80be__W0QQ_armrsZ1

 

That looks like a highly classified Thing - A - Ma Jig for controlling a What ya ma call it with a hoo dickiy
LOL

no really I think its an ADC / PIC test board.All them pots gave it away.
looks like your using the yellow colored solder flux??
hope you covered the traces w/ clear coating of laquer or ??
I am planning on building a test board myself.
I assume the header plugs into the 8 pos socket on a Junebug??(the clone you built)
what I want to find is some pre assembled ribbon cables 8 cond and 5 cond.
you have a schematic I could use for suggestions?? on building a test board.
presently I have an 18 pin socket with 4 LEDS, 4 resistors for the leds , a diode and resistor for the PIC and a 5 pos header.

 

I like to place a sacrificial wide line around the entire design. Many times the line will fail to transfer/etch but the rest of the design will be perfect.

__________________
Please post questions to the forums. PM's are for personal communication.

BCHS/3v0's Tutorials
Junebug USB PIC programmer kit., USB Bit Whacker,
The 15 Minute Printed Circuit Board! (+drill time)

 

Or take a fat sharpie around the outside edges of the board. I used to do that to stretch the ferric chloride life (I would color in any large areas as well or polygon them in Eagle) and it speeds thing up a little.

Heat all over is key for sure.

I need to get one of those cool made in China stamps though.

 

The CNC I use for drilling requires room on the bare PCB for clamping. The extra board makes the PCBs a bit easier to handle/process. I use cheap box tape to mask over the unused area to save on etchant.

I also use it to mask the other side when I etch one side at a time.

__________________
Please post questions to the forums. PM's are for personal communication.

BCHS/3v0's Tutorials
Junebug USB PIC programmer kit., USB Bit Whacker,
The 15 Minute Printed Circuit Board! (+drill time)

 

I increase the distance from traces to ground planes.
then only the space between the trace and plane are etched.
also found using a thin board so that light can be seen in the etched areas so any shorts or trace breaks can be seen very clearly when held up to a light.
the board pictured has liquid tin applied.
It seemed to make soldering easier.

Attached Thumbnails

 

 

Believe me I don't even like educated guesses.
This will be tried shortly and that is not a guess, educated or other vise.
Ultrasonic cleaners are all about getting the transducers energy transfered into the liquid, it does not focus ALL the power to stuff on the surface.

 

That's right, a small percentage is lost as heat in the liquid. But they are pretty efficient at transferring the power to the surfaces being cleaned.

Hey I didnt say it wouldn't work... Just that it might not be the best agitator.

The commercial systems (like in the PCB house) stand the board vertically and pump hot etchant to the top of the PCB to drench it in a constant flow. Thats gonna remove the copper, bubbles, and fouled etchant very well WITHOUT stressing the mask too much.

 

The way i etch PCBs is to put the board in an approx 10x3inch icecream box(plastic) about 3 inces thick.Pour hot(electric kettle for best result) water on it, some chunks of FeCl(even this is hard to get where i live).Close the lid and move the box like a see saw so as to make the etchent flow on the surface to and frow. Gives a PCB with in 2 to 3 minutes. Cheap and easy.

__________________
Syed

 

I use Muriatic Acid / Hydrogen Peroxide and have always been afraid or heating it because of the corrosive fumes. Had a friend once that ruined a shop full of tools, don't know what he used for enchant.
That is impressive etching times, thanks for posting. Now we know what we have to strive for.

P.S. About toner transfer DIY paper, I am going to test the heavy duty wax paper used by butchers; have not got any yet. I am also going to test the bag that some breakfast serials comes in.

 

Rolf you need to create a website in the same fashion as the will it blend site.
You could call it, "Will it print?"

__________________
Inside every little problem, is a big problem trying to get out.

 

You are a man on a mission . I would tell you not to bother because all these things have been tried, but the the composition of the coatings may have changed since anyone gave them a shot.

__________________
Please post questions to the forums. PM's are for personal communication.

BCHS/3v0's Tutorials
Junebug USB PIC programmer kit., USB Bit Whacker,
The 15 Minute Printed Circuit Board! (+drill time)

 

I hope they overlooked a few.
Maybe more than that, because there must be thousands of different papers out there.

 

Please don't be offended and take this as constructive criticism.

I know this is your first attempt, good it works but next time I'd advise neatening it up a lot, it's far too sloppy. If I designed a PCB like that at work they would tell me to do it again; it wouldn't even be allowed to be manufactured, it would have been rejected at the design phase.

The resistors should all be mounted straight (preferably at right angles) with the leads perfectly straight and no wiggly bits.

What's with the copper wire?

Did you forget to put the traces on? Fair enough these sorts of modifications might be necessary at prototyping phase but it certainly shouldn't be part of the design.

Those holes are far too near the pads, traces and components. You should allow enough room for error when drilling and for any fixings you plan to use: nuts, washers, screws etc.

Also try to make the tracks at 90° or 45° angles and avoid tight corners which tend to etch poorly.

I've put crosses through all the really bad parts. To be honest the rest isn't much better but most could be fixed by forming the component leads correctly and better soldering technique. You've probably got many poor solder joints whcih can't be seen on the photo.

Curious Inventor - Guides : How to Solder
http://www.elecraft.com/TechNotes/N0...009JAN2007.pdf

Unfortunately I couldn't find any tutorials that go into lead forming as much as I'd like.

I tend to make the ¼W resistor leads 0.4" (about 10mm) pitch so I can use veroboard as a forming jig.

You might think I'm being picky but it's important to do a reasonably neat job otherwise fault finding can be very difficult: bad joints can be open circuit and crooked connections can easily short circuit. You want to minimise that risk of errors not maximise it.

Attached Thumbnails

   

__________________

I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong.

Please ask on the open forum if you have a question and I'll be happy to help, if I know the answer.

 

reusing a old used board IMHO it looks pretty good.
not as good as if the board was from scratch.
I myself plan on building a test board from scratch.
just need a schematic of something that already works.
why reinvent the wheel??