The thermal transfer method is a way to make printed circuit boards quickly in small quantities. It makes use of the anti-corrosion properties of laser printer toner, has a fast board (20 minutes), high precision (line width 15mil, pitch 10mil), low cost and other characteristics, but due to the limitations of the process of applying solder resist and over-hole metallization, this method can not be convenient to produce any wiring double-sided board, only to produce a single panel and the so-called "quasi-double-sided panel "
This method is not yet convenient for making arbitrary wiring double-sided boards.
The realization of this method, you need to prepare the following equipment and raw materials: a computer a laser printer, printer toner with cheap compatible toner can be; heat transfer paper, you can also use self-adhesive paper instead of the back of the glossy paper, but to cut their own; metal shell iron a handful of the so-called "heat transfer machine (converted with plastic sealing machine) "can also be, I think the effect is not as good as the iron, and very expensive; copper circuit boards, bakelite substrate and fiberglass epoxy resin substrate, the latter's performance is better; corrosion of containers and medicines, containers can be used with a plastic box, medicines can be used with hydrochloric acid and hydrogen peroxide; drilling drilling machines and drills, drills are generally used to 0.8mm, 0.6mm and 1.0mm Of course, there are also a series of mechanical tools such as sawing boards and grinding edges.
Because of the characteristics of the thermal transfer plate, in the wiring should pay attention to the following aspects:
1) line width of not less than 15mil, line spacing is not less than 10mil. in order to ensure the safety of the line width should be 25 ~ 30mil, high-current line in accordance with the general principles of widening the wiring. In order to cloth through the line, the local can be up to 20mil. 15mil to be used with caution. Wire spacing should be greater than 10mil, the best pad spacing is greater than 15mil.
2) Try to fabricate a single panel, can not be fabricated when you can consider jumper wires. Still can not cloth through can consider the use of double-sided panel, but taking into account the welding to weld the pads on both sides, side-by-side double-row or multi-row package components in the toplayer do not set the pads. Wiring should be reasonable layout, and even consider switching the order of the unit of multiple single components (such as 6 non-gate), in order to facilitate the layout of the pass. Try to use manual wiring, automatic wiring often can not meet the requirements.
3) There are 0.8mm holes in the pad to be more than 70mil, recommended 80mil. Otherwise, the pad will be damaged due to poor hole punching accuracy.
4) The diameter of the holes can all be set to 10 to 15 mil, does not have to be the actual size, in order to facilitate the drilling of holes when the drill bit alignment.
5) Bottomlayer's word should be flipped over and written, Toplayer's written squarely.
The list of appliances :
A computer a laser printer (no excitation can go outside to play);
Thermal transfer paper
Iron a hand
Copper laying circuit board
Corrosive containers and medicines
Drilling with the drilling machine and drills
Sawing boards sandpaper, etc.
Here is a very detailed video presentation of homemade circuit boards, it's so awesome that I have to admire it! You'll know it when you see it:
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