Morse key and clopper

A feature of the proposed design of Morse key and klöpfer (German Klopfer - literally. One of the meanings - "door knocker") is the use of 3D-printed parts.

First consider the device key.
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The numbers denote:

1 - the upper contact bolt around which the wire is wound. If it is insulated with PVC, it must be cleaned with a stripper, if it is varnished, winding is sandpaper. The bolt in the author's version of M3.5, under the other, you will have to redo the thread in the STL file. Rotating the bolt, you can adjust the gap.

2 - the lower pin screw, screwed into a wooden stand, and a stripped wire is also wound around it.

3 - loop, the hole diameter in it is 2 mm, it is convenient to use a single conductor wire with a cross section of 14 AWG (this is about 2 mm ² , so you have to choose between 1.5 and 2.5).

4 and 5 are openings for the upper and lower magnets, each of which contains two neodymium magnets with dimensions of 6x3 mm. They replace the spring to return the key.

6 - clamps for connecting the line between the key and the klopfer.

Klopfer is a little more complex.





The numbers denote:

1 - electromagnet. Wrap an M3.5x40 screw with tape and wind several hundred turns of magnet wire. Leave the "tails" length of about 200 mm each.

2 - a lever with a bolt 3,520, on which a cap nut was screwed, knocking on the screw-core of the electromagnet.

3 - the holder of two neodymium magnets 3x6 mm in size, the thread allows you to adjust the height.

4 - two of the same magnet, pressed into the lever, their task is also to replace the spring.

5 - loop, designed for the same hard wire as in the key.

6 - a slit for a paper tape in case you want to add a pencil, reels and a gear motor to the kalpher.

Near the electromagnetic control circuit is located:



The type of MOS transistor in the author's version - IRF3205. The clamps for the line and the line itself between the key and the klopfer are not shown in the diagram. The design of the battery compartment is shown in KDPV, and you can use a ready-made 2xC or 2xD compartment.

STL files:

All items together

Key foundation separately

Top and bottom of klöpper separately

Separately, the details that are in the author's version are orange.

Separately plates for clips

Construction in action: