Making a Hand Drawn PCB.

For my latest electronics project I decided to make a resistor substitution box, instead of just using another perf-board I decided to make a pcb for it so I could document the process and make an instructable. I decided to do this because I have yet to see anyone do it on Instructables so I figured it would be a good thing to share. This process works well for simple circuits that do not have a lot of small parallel bus lines in them, I have done a few guitar stomp boxes this way as well.

Step 1: Materials

Materials to design and Draw the board:

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-Paper and Pencil
-Ruler
-Sharpee
-Tape
-Scissors
-Tiny #65 twist bit (0.035" which is good for most electronic components)
-Dremal or pin vise to drill holes, the Dremal is the obvious winner here
-Copper clad PC board

Materials to etch the board:

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-Ferric Chloride(FC), which is used to etch the board
CAUTION Ferric Chloride is a very corrosive liquid the vapor well cause steel to rust, therefor one must take all precautions nessessery in order to protect yourself as it well cause nasty burns and alike. So therefore you well also need
-Rubber Gloves
-Safety Glasses
-Paper towels to clean up spillage
-A well ventalated work area as the vapor is also quite nasty and not good to breath in.
Aside from all the safety stuff you need,
-A small resealable plastic container to put the FC into for etching and storage afterwards.
-A larger plastic container that the small one well go into for water and storage of materials afterwards.
-Warm water, goes in larger container to heat the FC.

Comments

[dcutter1]

Anyone ever try the type of pens that have metal in the ink and are prmanent like this one - Sanford Silver Coat and Gold Coat Markers Permanent, fadeproof, waterproof. Metallic ink works on most surfaces. Acid-free.

[Ohm]

I know there is a special pen that you can buy to repair pcb traces, it might be interesting to see what kind of conductivity that the stanford inks have and again it would be only for repairs as you couldn't solder too it.

[dcutter1]

I guess I was a little miss-leading in pointing out the metallic pens. I was just pointing out there might be better type ink pens that could be used then the permanent marker pens to hand draw circuits for later etching. Maybe they would less likely be undercut by the acid.

[KJ4ZVQ]

If they have metal in the ink, would'nt the etchant just eat the pen traces as well?

[guitarman63mm]

i tried doing this before, it didn't work well to say the least the ferric went under the sharpie, and through the copper , leaving me with barely any traces all 3 of my homemade stompboxes didn't work, none of the traces stayed on, but i still tried anyways, so now i have $200 in wasted parts :\ not quite sure what i could do to salvage the stuff

[seanulous]

get a desoldering iron. just curious... did you have black lines and did you let the ink completely dry for about an hour? I could see how the ferric chloride would just plow through traces made by a sharpie if they were put on there minutes before trying to etch it, for sure. and why didn't you take a voltage reader and measure resistance in ohms on a straight line / trace with the pin things an inch apart and see whether its conductive or not.

[n0ukf]

Perhaps you didn't make the traces heavy enough to resist the etchant. A fairly fresh sharpie would work the best, not a very used one that will no longer make a solid black line.

[arduino man]

Can I use PCB Etchant Solution from Radioshack.

[seraine]

Yes, that is ferric chloride.

[beehard44]

i read you can use wax instead of sharpie... might make an 'ible next week

[shadowkiller]

 Hi,
I used a  uniball pen instead of a sharpie. Would that work or will I need a sharpie???

[Ohm]

I am not sure, I have always used a Sharpee, if you are willing to experiment try it and let us know, otherwise get a Sharpee and redo it to be safe.

[shadowkiller]

I just tried and  It kind of worked. Most of it came off.
Oh well, Back to the drawing board.

[Derin]

Use any OHP or permanent marker. My electronics book says a pen you can use is the Edding 140S.

[bobfit]

I have not been happy with the Sharpie pen as it sometimes washes away in the etchant, especially if you are using a foam brush to speed up the etching.
Nail polish works but it is difficult to get even traces. Recently I bought a Testors enamel paint marker (available at Michaels or maybe your local hobby shop). I sharpened the wide tip to a point and proceeded to draw the circuit. Works like a charm. For IC's paint a bar for the the entire pin row then remove the paint with a knife between pin holes.  I use a Radio Shack universal pc board as a drilling jig to locate the pin holes before painting. Use lacquer thinner to remove the paint. 

[Ohm]

Great tip, I never really do the foam brush bit so I never noticed any problem with the sharpee in that way but the paint pin sounds like a good idea all the way around, I well have to give it a try the next time I do one. With your permission I would like to add the paint pin to the materials list, credited to you of course.

[raykholo]

combining this idea with another tutorial--- would it be possible to transfer an eagle schematic onto the board using UV light, then following ur instructable of tracing it over with a super fine sharpie and etching it?

[dagenius]

There would be no point. Might as well just use the UV for everything. You would gain nothing by using both.

[Dipankar]

Check this out.
Draw your circuit directly on the copper board and drill the holes.
Paint the Circuit with NAIL POLISH.
Then start the Etching process.
The Nail polish will save your circuit from being etched.
The places not covered by the nail polish will be eached.
Job done.

[charlieb000]

hmm maybe correction fluid? the type of pen that the shop here sells to mark is a "paint" pen.

[Ohm]

Yeah thats another way to do it, I think the Sharpee method is much easier to do and gives cleaner/finer lines.

[gauravkpatil.973]

Why we use Ferric Chloride? Is there any other way for Ecthing Process?

[Ohm]

Because I had it, simple as that, it is nasty stuff though. If you do some searching there is an instructable on making a homemade etching solution that is cheaper and I think I little safer, when my FeCl runs out I well be making some of that stuff.

[T3h_Muffinator]

I'm trying to make my own pcb using the same process: any clue on how effective the "ultra-fine tip" markers or different colored sharpies are?

[Ohm]

I am not too sure how the ultra fine pens well do or the colored pens either, what would probably be a good idea is to take a small square of pcb and test some of the different pens out. I do know it works best if the lines are nice and bold so I think the biggest thing is to make sure you have a good layer of ink down.

[Botfly]

What is the proper way to dispose of the toxic stew?

[dentsinger]

I wonder if there's a way to filter and reclaim the copper from the etching waste, then re-use the ferric chloride. I've never etched pcb's, but this does sound like something that needs to be addressed properly.

[inertia18]

put this in a dark colored bottle mix with water until on the brim of the bottle then bury it

[cirano]

I remember reading somewhere that used ferric chloride should be mixed with baking soda inorder to neutralize it and make it safe for disposal. (please feel free to set me straight)

[zachninme]

Actually, washing soda, not baking. (Very different stuffs indeed ;-))

[bustedit]

is washing soda also called baking powder? i always confuse baking powder and baking soda, so I am not allowed to bake...im a griller and a saute-er.

[zachninme]

Washing soda is not baking soda is not baking powder!
Washing soda is sodium carbonate
Baking soda is sodium bicarbonate
and baking powder is a mixture of baking soda, a alkali, and a dry acid such as cream of tartar.

None can be substituted for one-another. However, you can make baking powder using the recipe above.

[awang8]

Baking soda is a alkali itself so the alkali doesn't do much but the dry acid will make it react as soon as it gets near something with a pH around 7 (or a pH that IS 7.)

[bustedit]

and i can make baby powder with old dried babies

[cirano]

Ah! Thanks for the correction. That is completely different indeed. I wonder if someone can actually post the chemical reaction that shows the neutralization process?

[microman171]

You store it in a jar until it doesnt work anymore then you pour it down the drain with LOTS of water

[ARVash]

Whatever cannot be saved for recovery or recycling should be managed in an appropriate and approved waste facility. Although not a listed RCRA hazardous waste, this material may exhibit one or more characteristics of a hazardous waste and require appropriate analysis to determine specific disposal requirements. Processing, use or contamination of this product may change the waste management options. State and local disposal regulations may differ from federal disposal regulations. Dispose of container and unused contents in accordance with federal, state and local requirements.

Ahem

http://www.jtbaker.com/msds/englishhtml/f1080.htm

a simple MSDS sheet :P google is your best friend.

[i.c.rhodes]

How would you go about converting a schematic to a pcb layout manually, with no software. I would like to teach students how to do this before they go on to using layout software.

[Ohm]

The easiest way to do it is to draw the circuit out with all of the components in there actual form, ie transistors would be drawn with there leads in the right order and ic's would be drawn as a box with all the leads sticking out and the connections made around it in a planer fashion. The biggest thing is to try and draw the circuit diagram in planer form, ie no connections crossing without connecting, you can of course have jumpers on top of the board to go over other traces and you can also have traces go between solder pads for another component like a resistor. Then all you have to do is copy that to the pcb and go from there, reversed of course. It helps to use graph paper as well. From there it is just trial and error and after a while you start to figure out what works well and what does not.

[royalestel]

Cool--this seems the most straightforward way to make a PCB I've seen. Thanks for posting this!