Expandable boards. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Expandable boards. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies

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In electronic equipment with a high installation density, it is very difficult to get to various components and parts when setting up or replacing them during repairs. Therefore, in serial devices, various movable connections of structural elements are widely used. However, it is not always possible to make such connections under amateur conditions.

I have developed a small-sized hinge joint for boards, lightweight covers and case walls. By using it to connect several printed circuit boards (Fig. 1), a compact unfolding structure is obtained. Similarly, fully or partially opening housings can be manufactured.

The parts are connected with copper wire, forming loops perpendicular to the axis of rotation. It is advisable to make boards and cases from fiberglass laminate, which has increased strength. If a more fragile material is used, fiberglass strips are connected with loops, and parts are already attached to them.

Drop-down boards
Rice. 1. Layout of “drop-down” printed circuit boards: 1 - board, 2 - swivel joint, 3 - mounting area

Make the connection in the following sequence. The boards to be fastened are folded so that the edge of the bottom protrudes by 0,5 mm, and fixed with a hand vice. Next, at a distance of 2,5 mm from the edge of the top board, through holes Ø 5 mm are drilled at intervals of 0,8 mm. If the requirement for the strength of the connection is not high, it is enough to drill several holes in two or three places.

Drop-down boards
Rice. 2. Swivel: 1 - winding wire, 2 - boards

Then the boards are separated and the holes in the bottom are drilled to Ø 1,5 mm. Finally, all holes are countersunk on both sides, and the edges of the boards are rounded with a file. After this, a copper winding wire PEV - 2 0,62 is passed through the holes as shown in Figure 2. The ends of the wire are secured.

Instead of winding wire, you can use other materials, for example, nylon fishing line of the appropriate diameter.

Author: A.Tychinin

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