Printed Circuit Board
Printed Circuit Board
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How to make Printed Circuit Board in home ?
I have to make projects for my final year .My stream is electronics 7 telecom . Now unfortunately my college doesn't provide resources or guidance for vocational electronics . Please provide me sites where i can learn how to implement circuit in PC B's without sophisticated machines or hard ware in home ? The final product will be a simple electronic apparatus so no HI FI requirement
>>>>>>>>>
EDIT:
Home brew PCB's are OK for small and simple PCB's. (Single sided) and when you are going to make one or two. Otherwise you will best be served by using a PCB fabricator like PCBexpress.com or SpeedyPCB.com.
>>>>>>>>>>
Here is a review of one of my older answers: I have made a few prototype PCB's at home using a Toner Transfer System to add the resist art word to a copper clad board for etching.
I suggest that you use DipTrace as a means of creating your schemaic and art work. You can obtain the transfer materials at Digikey (182-1003-ND) and Radio Shack sells ferric chloride etchant. You will also need plastic trays to do the etching in.
Press-N-Peel OR Toner Transfer System:
Must be used with a laser printer. You can use your inket to make the artwork which you then photo copy for toner transfer.
The toner in photo copiers and laser printers is a finely ground plastic. The powdered toner is melted onto the paper by a fuser (heater)
The Toner transfer method relys upon the remelting of the toner to transfer the image onto the copper board.
To aid in the process set your printer settings to make the darkest high contrast print you can. This will place the maximum amount of toner onto the paper and make it easier to transfer the image.
Tips.
1.) Use a dowel or rolling pin under the PCB while ironing. This will provide a point contact against which the iron will press the PCB against. THis will effectively increase the pressure you can apply to the transfer.
2.) The PCB must be really really clean, Lightly scour mine with a scotch bright pad and some cleanser. Don't press hard as you don't want to score or gouge the surface. Use light circular strokes and rinse well and let dry. Handle only by the edges use gloves if necessary to avoid getting skin oil on the cleaned board. Skin oil will act as a resist and cause uneven etching or worse a finger print left in copper.
3.) I gently warm the etchant in a water bath to speed the etching. Rock the tray slowly to keep a gentle wash of etchant over the surface.
4.) Use toner transfer foils to build up the resist on the toner transfer image.
5.)Brake cleaner is an awsome cleaner for the removal of the toner resist after the board is etched or if you make a mistake in transfer.
6.) Get some fine tip Sharpie permanent markers. These can be used to touch up the resist (transfer) . You can use thicker tip pens to shade over a toner area that has pin holes. Use the thinner one to drw sections of a missig trace.
7.) use a different color sharpi like red to hight light where your touchups are.
8.) Use a sharpie as a last step only after a toner foil has been applied. (Toner foil only sticks to toner)
9.) Detune your PCB software, increase the distance between traces , widen the min trace width and use larger pads. Don't try to fit traces between IC pads, yes you can lay it out that way but consider that your homebrew PCB will have lots of undercutting. Keep your routing simple.
10.) Stick to single side boards and resolve yourself that you will need to use jumpers instead. Registration issues between two sides are just not worth the effort with Toner transfer. Rerout and move components to minimize the number of jumpers.
11.) Avoid using surface mount passives, use through hole caps and resistors instead. Traces can be easily routed between through hole components easily with room to spare. This will provide alternate pathways for routing which will minimize the necessity for jumpers.
12.) Do use surface mount IC's SOIC package is easy to solder to PCB. Remember that DIP IC's will require drilling lots of holes evenly spaced and inline.
13.) its easy to drill two holes to mount a resistor or cap. If the pad is large enough then hole need not be drilled as the leads can be cut and soldered to the pad as an optional means of attachment. (another reason to increase pad size)
14.) Toner Transfer is a prototype system for makig a small number of PCB's or a one of project. Consider PCB express if your need multiple boards.
15.) Keep your board size small 4x6 at most.
16.) If you have a small PCB design say 2x3 consider copying the artwok/ design to make one large piece of artwork that contains copies of the smaller design.
So transfer and etch 4 2x3 boards on a single 4 x6 PCB.
17.) Keeping designs small and etching multple copies on a single PCB and artwork improves your odds that you'll get atleast one usable board from the run.
18.Use ONLY PLASTC trays to etch in.
DO NOT USE Alumininum trays !!!
19 Check out DipTrace which is an easy to learn and use schematic capture and PCB router. THere is a FREE version which has a 250 point limit for hobby & student use.
20.) Check out McMaster carr for PCB drills (wire size)
I use P/N
2841A43
Carbide Small Dia 1/8" Shank Twist Drill Bit Wire Gauge #42, 1-1/2" L Overall, 13/32" Flute Length $5.34 Each
21) Add Copper Pours to your PCB design. Pours are larger areas of copper that will not be etched away. This will save your etchant and speed your PCB etching as you won't have to disolve excess copper. Plus large copper pours can be used for ground planes an
DIY Printed circuit board