Production of a combined connector. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies
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Despite the fact that connectors of various designs can now be found on sale, there are situations when not a single factory-made connector meets the task. There are also cases when purchasing a ready-made connector is more expensive than making it yourself.
I propose the design of a simple homemade connector that does not require scarce materials, is easy to use and fits well into the design of the instrument front panel. It has protection against erroneous docking and allows you to increase the number of pairs of contacts.
For the manufacture of the connector, you will need cuttings of double-sided foil fiberglass with a thickness of 1,5 or 2 mm and a factory-made multi-pin connector from the ShR series assembly (female and pin blocks), which must be disassembled and the pin and socket contacts removed (Fig. 1). Consider the process of manufacturing one pad for six contacts (three pairs).
The basis of the node is a plate with dimensions of 40x20 mm double-sided foil fiberglass 2 mm thick. The foil on each side of the plate is divided (with a cutter or scalpel) by four slots into five strips parallel to the short edge. The width of the two extreme strips should be 5,5 mm, the three middle ones - 7 mm; the width of the slots free from foil is 2 mm. All dimensions are indicative.
The plates are soldered to the three middle strips of one of the sides along the pin contact from the ShR connector, having previously tinned their thickened shank. Three sockets from the ShR connector are symmetrically soldered to the same three strips of the other side. One of the connector blocks is ready.
If you make the same second block, the connector will be ready. Before soldering the pins and sockets of the second block, dock them respectively with the sockets and pins of the first, insert the prepared plate between the rows of shanks and solder - this will achieve an exact match between the blocks.
If one of the blocks needs to be mounted on the wall of the case, screw two steel corners to the extreme strips of the plate, and a decorative plastic panel with three pairs of holes to the corners. In each pair, the diameter of one hole is 0,2 mm larger than the diameter of the pin, and the other is 0,2 mm larger than the diameter of the socket. Therefore, it is possible to dock the pads in only one position. The view of such a block is shown in Fig. 2.
The mutual placement of pins and sockets can be changed, providing the connector with new individual characteristics. If, for example, on one of the pads, the pins are moved back by 2 mm before soldering, the connector will acquire a new quality - the contacts of one row will always close first.
You can vary the distance between the pairs of contacts of the block and even, if necessary, between the contacts of the pair. To do this, the base must be made of two plates, foil-coated on one side, and fastened in parallel with screws, inserting washers between them. By changing the height of the washers, the distance between the contacts of each pair is changed.
The positive qualities of the connector should also include the high reliability of the connection, both electrical and mechanical.
Author: V. Larionov, pos. Laishevo, Tatarstan
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