fantastic double sided pcbs at home using photoresist method

by:Rocket PCB     2019-12-13
As an amateur, I always want to have my pcb in a professional way, with 10 traces of distance, double-sided and error-free that you can track.
Of course, it is \"almost impossible\" to make this pcb using toner transfer method at home.
I have tried the toner transfer method, Press N leather paper and photopaper. Result ?
None of this has brought me good results.
Because it\'s only good if you do a single method. sided boards.
Ironing causes the toner to melt when you make the double panel, which makes the paper a bit slippery.
But there shouldn\'t be any mistakes if you\'re dealing with the tenth trace.
UV anti-photoresist method (
)
This is also used in the production of silicon chips, and the result is almost perfect.
Pcb plating for bare :---
1 can is-20 spray --nearly 20TL(
Turkish lira in Turkey)---
Or, if you have a chance to get access to sensitive PCB, don\'t bother to buy anti-photoresist spray, pre-made PCB would be better but not in Turkey so I used spray. ---
The hair dryer can blow dry the pcb sprayed---------------------------------------------------------------------------------------------------------------------------------
Used to expose PCB---
Like 1X pairs of glass in any size--Free---
2x8 w uv fluorescent lamp (
I don\'t know the exact type of uva. A or uva-
But these black tubes are good)---3TL each---
2x fluorescent module, you can use directly with fluorescent lamp--6TL each---
Dostoyevski has a thick book of more than 400 pages and a hard cover. It is a good choice for this job: D---------------------------------------------------------------------------------------------------------------------------------
For development and etching :---
Sink cleaner in the form of 1X granules, in fact it is just sodium hydroxide (
(Sodium)0. 5TL---
1X1 liter hydrogen peroxide 7TL---
1X1 liter stand (
Hydrochloric acid)
1TLTotal cost: 46.
If you have a Premin pcb and 5 TL is equal to $31, you can skip this step.
Before using the spray on the board, first lay some paper towels under the pcb, this step is very important, because if there is extra paint on the first side of the pcb, the towel will suck off the extra paint, this creates a good homogeneous layer.
Also try to spray it arounddust-
Free environment when spraying onto the pcb, starting from the top, and then moving the Board pcb with a zigzag wrist.
When you finish the first layer, if you wait for the first layer to start curing, this will cause the second layer to notuniform.
After finishing the fist side, wait for 2 minutes, then set the hair dryer to medium speed and dry the plate for 5 minutes or less depending on the thickness of the layer.
Then apply the same steps on the other side. P.
S: You don\'t need a dark room for the anti-photorist app.
Just avoid direct sunlight.
This is the most basic uv setting I think.
I will upgrade it to a dead tablet scanner later.
As you can see in the photo, the distance is marked.
You only need a few books, clean glass of about 3mm thick, UV tube of 2X8 W and electron fluorescent module.
This setting gives me 12 minutes of exposure.
Keep in mind that the exposure time depends on the distance and the thickness of the photoresist layer. Sprint the pcb design to semi-transparent paper using a laser printer or inkjet.
For the top, mirror your design and print it out at a resolution of at least 600 dpi, I use an inkjet printer and I think it\'s better than a laser printer.
The bottom of the normal print design (not mirrored).
After printing the clear film, wait for them to dry, and then cut and align it to the UV glass through the reference holes and holes.
Use the same tape to protect them after Alinging.
Fixing the transparent film on the pcb with tape, the main trick of exposure is to apply a lot of pressure on the board, which can be achieved by hard cover books and heavy books: of course, you can use a second glass on it and then pressurize the pcb with a clip.
You need 1 liter of water and 7g of caustic soda or sink cleaner or sodium hydroxide (
All the same)
At the same time as preparing the development solution, the trick is not to exceed the sodium hydroxide of 7gr, otherwise the solution will be concentrated and all the resistance will be washed out suddenly . .
When you put the pcb into the solution, after the development process is completed, clean the pcb with water and the track will be visible in 30 seconds.
I developed with hydrogen peroxide and HCl.
Using fecl3 is a question of choice.
I don\'t like to wait that long for etching so I use this method.
Note: This process produces chlorine gases that are toxic to your health.
Risk of use on its own. Not bad eh ?
: DI found the results very satisfactory and after making some pcb you will get experience with exposure time. The following figure is the first pcb I made using the anti-photoresist method and its trajectory is clear
Hope you enjoyed my first instruction sheet and my next one will be about tin plating at home with cheap chemicals.
I also have some step-by-step guides for Turkey on www.
Ceyhunderinbogaz. comBye!
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