Electric spark pencil based on vibrating alert. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies

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In my article "An electrospark pencil from a miniature relay" ("Radio", 2005, No. 8, p. 37), a tool based on the RES10 relay is described. Since then, cell phone vibrating alerts have become widely available, which made it possible to implement the instrument in a different design. The pencil has become even lighter, more compact and more comfortable to use. Even a child can draw with them.

The scheme of the new pencil is shown in fig. 1. The principle of inscription remains the same: the electrode-needle vibrates on the metal surface of the part, closing and opening the electrical circuit with a load current of about 1 A at a voltage of about 20.30 V, obtained from the secondary winding of the step-down transformer T1. The resulting spark destroys the surface of the metal, leaving a black mark on it - a line. The current in the circuit limits the resistor R1. The vibration of the electrode is created by the electric motor of the vibrating alert M1, fed from a separate source - a galvanic cell G1 with a voltage of 1,5 V. Switching is carried out by switches SA1 and SA2: the transformer is connected to the network first, the vibrating alert to the G1 element is the second.

Rice. 1. Diagram of a new pencil

The design of the pencil is illustrated in Fig. 2. Needle-frame 1 is made of a piece of steel (the so-called "beekeeping") wire with a diameter of 0,4 ... 0,7 and a length of about 115 mm. The segment is bent in the form of a letter P elongated in the vertical direction. Its bent part is a rectangular frame with sides of 40 and 3 mm, and the rest is flat - a needle about 30 mm long. On one side, a vibrating alert motor 3 with an eccentric 2 is screwed to the frame. A strip of electrical tape and a coupler 4 made of copper wire are used for fastening. The other side of the frame, with the help of screw 6 (M3x10), nut and washer 5 placed under the screw head, is rigidly fixed on the fiberglass printed circuit board 12 (Fig. 3). By changing the distance between the screw and the electric motor 3 (shifting the frame under the screw 6), it is possible to adjust the frequency and amplitude of the needle oscillations. In addition to the needle, the G1 battery (indicated by the number 7) and the SA2 switch (9) are fixed on the board. The holder of element 8, which simultaneously performs the function of a contact connector, is bent from steel wire from a previously straightened paper clip.

Rice. 2. Pencil design

Rice. 3. Pencil assembly

The board 12 has a "tail", on which the pen 10 (a section of the body of a ballpoint pen) is put on. Wire 11 passes inside it, connecting the needle with the clamp engine of the ballast resistor R1. For reliable fastening of the handle, the shank is wrapped with two layers of electrical tape.

The vibrating alert, the SA2 sliding switch and the AG13 battery (diameter 11,6 mm) were removed from the vibration beetle toy. Transformer T1 - TPP3-6-220-50K, resistor R1 - adjustable wire PEVR-30.

Rice. 4. The position of the pencil in the hand when working

The adjustment of the pencil is reduced to the selection of the "spark current" by moving the resistor clamp engine near its middle and the amplitude of the needle oscillations - by shifting the frame relative to the screw head 6. The position of the pencil in the hand during operation is shown in fig. 4.

Author: D. Mamichev

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