Multi-position sliding switch. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Radio amateur designer
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In amateur radio practice, there are often cases when a miniature slide switch with more than three positions is needed. Commercially available sliding switches usually have two or three positions and only one or two directions.
P2K pushbutton switches are widely used in electronic engineering. They are well-deservedly popular with radio amateurs. The modular design of these switches and their sectional nature allow for many different combinations and are convenient for printed wiring, but with all variations in the number of directions, the number of positions remains unchanged - two.
The parallel increase in the number of P2K cases, proposed by S. Minaev in the article "P2K instead of a biscuit switch" ("Radio", 1990, No. 5, p. 61), increases the dimensions of the switch and makes it inconvenient to use, since the operating positions correspond to rather complex combinations of pressing several buttons.
To obtain a single-case multi-position slide switch, a simple revision of the original P2K will be required, and a faulty one or roughly dismantled with wire cutters from the printed circuit board is suitable.
Fig. 1
On fig. 1 shows the device of the 8P2N slide switch (only the body is not shown), converted from P2K with eight groups of contacts Of the eleven possible positions of the switch slide 1-2-V-3-4-V-5-6-V-7-8 there are three intermediate positions , marked with the letter B, correspond to the off state and are not used in operation.
P2K must be disassembled and the housing cover removed, leaving the pin contacts in their places. The operation should be performed gradually, in small fragments, separating them with wire cutters. In place of the cover, it is necessary to install and glue with BF-2 glue the contact strip 1, made of fiberglass laminated on one side with a thickness of 1 ... 1,5 mm. Printed conductors and pads on the bar are etched. After the glue dries, the pins of the contacts on the bar must be soldered so that excess rosin does not flow under the bar. The bar can be made wider and longer if there are no obstacles to this at the place of the future installation of the switch.
The movable group of the switch consists of a handle 2 and a slider 3, fastened with two M2 screws 6 mm long with a countersunk head. The slider is a segment 16 mm long of the P2K rod between lines A and B (Fig. 2).
Fig. 2
Two holes are drilled along the edges of the engine and an M2 thread is cut into them.
The handle can be cut out of any plastic sheet with a thickness of 3,8 ... 4 mm. Movable contacts from P2K are installed in the grooves of the engine, inserted into the prepared case and the handle is screwed. The movable group should move freely with the handle, without jamming, from lock to lock.
Fig. 3
In the case when a complete replacement of the 10P1N switch with the formula 3P1N is necessary, the "print" on the contact strip must correspond to fig. 2. At the same time, a uniform alternation of positions is provided without intermediate unused ones - B-3-4-5-6-7-8-9-10-XNUMX-XNUMX.
If the converted switch is supposed to be mounted on a printed circuit board, in some cases contact strip 1 can be dispensed with - the board will perform its functions. It is necessary to cut a groove for handle 2 in it, drill holes for the switch contacts and form the corresponding printed conductors.
Author: E.Kondratiev, Moscow; Publication: radioradar.net
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