Button remote. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Radio amateur designer

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The figure shows one of the possible design options for a push-button remote control, which can serve, for example, as a joystick for a computer or video game console.

The remote control is made of cheap pushpins often found on sale, consisting of a figured plastic disk 4 and a steel needle 8. A metal (for example, tinplate) disk 3 with a diameter larger than disk 4 is put on the needle of each button, previously stripped from the coating. electrical contact, the fit must be very tight. Therefore, a hole for needle 8 is not drilled, but disk 3 is simply pierced with it. For greater strength, disks 3 and 4 are recommended to be glued together. The needles of all buttons must be blunted and shortened to a size, but 1 mm thicker than the gasket 1. Boards 6 and 11 are made of foil fiberglass.

It should be borne in mind that the needle 8, when the button is pressed, rests against the pad 9 on the board 11 and connects it to the pad 10 located under the spring 7 on the board 6. In the free state, the needle 8 does not reach the pad 9 and the circuit is broken . The contact pads of all buttons are connected in the required order by printed conductors to each other and to the pads for connecting external wires. The latter are usually placed on the outer edges of the boards 5 and 1, protruding beyond the dimensions of the panel 6 and the gasket 11. The pattern of the conductors turns out to be quite simple and it is possible to do without etching the foil by mechanically removing it in the gaps between the conductors.

In the top panel 5 (from any insulating material, for example, getinax), holes are made for each button. The distance between them is chosen based on the convenience of using the remote control. It is very important that the holes in the PCB panel 6 are aligned. Therefore, having temporarily fastened the board and the panel with screws, holes are drilled in them with a diameter a few tenths of a millimeter larger than the diameter of the needle. Then the board and the panel are separated and the diameter of the holes in the panel is adjusted to the required size. The hole in gasket 1 can be common to all buttons.

Now you can start assembling the remote control. Panel 5 with gasket 1 glued to it is placed face down on a flat surface. The buttons are inserted into the holes intended for them with the needles up. A spring 7 is put on each of them (it can consist of only one turn).

The most important operation is to put board 6 on the needles. It is necessary that each of them gets into its own hole. After that, it remains to put board 11 on top and fasten the entire structure with screws 2. Their number and location should be sufficient so that boards 6 and 11 do not bend under the action of compressed springs and when the buttons are pressed.

Having assembled the remote control, it is necessary, by alternately pressing the buttons, to check the ease of their movement and the reliability of the contact closure. It is recommended to do so. after loosening the fixing screws 2. and only having eliminated possible distortions and other defects, tighten them completely. The reason for "jamming" of the buttons can be either too small or too large a diameter of the holes in the panel 5 and the board 6. An excessively long spring 7 may also interfere, the coils of which abut against each other when compressed. It is often impossible to press the button simply because, during assembly, its needle 8 did not fall into the corresponding hole in the board.

The front panel of the finished remote control is painted or pasted over with a decorative film, cutting holes for the buttons in it. The necessary inscriptions can be put on the buttons or next to them on the panel. If it was not possible to purchase pushpins of suitable sizes and shapes, they will be replaced by homemade ones. Disc 4 is made of plastic. A head of a nail heated with a soldering iron of the desired diameter and length is fused into its center. If the material of the disk is not thermoplastic, the nail is attached to the pre-drilled hole by filling it with epoxy.

Author: V.Solonin, Konotop, Ukraine

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