Creating a two-sided board (video)
Hi habr!
I think that LUT technology is not a secret to anyone. A rare electronic blog does without an article on how to press a printed circuit board. But the topic of creating double-sided boards is for some reason covered less often. Although they are becoming more and more popular: we use microchips in small and multi-legged cases, and we are trying to reduce the size of the board.
I want to share with you a video that I made during the production of the next board. It demonstrates well one of the methods of creating a two-sided board.
')
A few comments on the video:
- It is convenient to take a piece of PCB larger than the board. Then it will be easier to align in the "sandwich". And you can cut after etching.
- Before removing the paper from the PCB (this can be done without soaking the board, if the paper is good), let it cool.
- You can print two sides at once in one go. The advantage of this approach is that it will be easier to combine them, and the disadvantages are in the complexity of implementation. For example, in Sprint Layout, you will have to copy the board twice and remove unnecessary layers from each copy. Manually.
- Transition holes can be soldered with a thin wire (one or two veins from the wiring of the cable). The wire is passed through the hole, bent to the track and soldered. The truth is, it is not convenient to place chips on such “metallization” in small (TSSOP, TQFP and smaller) cases, since the wire is noticeably raised above the board. An alternative could be chemical tinning, which Comrade describes here and there . evsi (he has a couple of posts on this topic).
I think that LUT technology is not a secret to anyone. A rare electronic blog does without an article on how to press a printed circuit board. But the topic of creating double-sided boards is for some reason covered less often. Although they are becoming more and more popular: we use microchips in small and multi-legged cases, and we are trying to reduce the size of the board.
I want to share with you a video that I made during the production of the next board. It demonstrates well one of the methods of creating a two-sided board.
')
A few comments on the video:
- It is convenient to take a piece of PCB larger than the board. Then it will be easier to align in the "sandwich". And you can cut after etching.
- Before removing the paper from the PCB (this can be done without soaking the board, if the paper is good), let it cool.
- You can print two sides at once in one go. The advantage of this approach is that it will be easier to combine them, and the disadvantages are in the complexity of implementation. For example, in Sprint Layout, you will have to copy the board twice and remove unnecessary layers from each copy. Manually.
- Transition holes can be soldered with a thin wire (one or two veins from the wiring of the cable). The wire is passed through the hole, bent to the track and soldered. The truth is, it is not convenient to place chips on such “metallization” in small (TSSOP, TQFP and smaller) cases, since the wire is noticeably raised above the board. An alternative could be chemical tinning, which Comrade describes here and there . evsi (he has a couple of posts on this topic).
Source: https://habr.com/ru/post/150814/
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