Non-contact electronic fishing rod - mormyshka. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Home, household, hobby
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Electronic devices are increasingly being used in various fields of human activity. Fishermen-athletes during trips to reservoirs seldom manage now without a pocket receiver. Recently, electronic devices for jig rods have appeared in the arsenal of amateur fishermen. There are several designs of such rods. The simplest - electromagnetic - is an electromagnet with a breaker, on the anchor of which a fishing rod is planted. Such a fishing rod works like a conventional DC electric bell. The variable resistance in the electromagnet circuit allows you to change the oscillation frequency of the fishing rod. This design of the fishing rod is not reliable enough, the breaker contacts burn out, and the breaker fails.
The non-contact rod described below is somewhat more complicated, but it works more reliably and lasts much longer. Tests of an electronic fishing rod-mormyshka on water bodies near Moscow showed good results.
Amateur anglers know that perch and other fish are more likely to take the bait if the line with the hook is given oscillatory movements at a frequency of 200-300 vibrations per minute. It is not difficult to make such a fishing rod from an ordinary fishing rod-mormyshka. The electrical circuit of the fishing rod is shown in fig. 1. It consists of a multivibrator and a power amplifier assembled on P14 type transistors. A trigger with two unstable states "operating in the key mode (transistors T1 and T2) is used as a multivibrator. The right shoulder of the trigger (T2) is also an emitter follower. The oscillation frequency is controlled by resistance R1, in the range of about 50-250 oscillations per minute. The oscillation range can be change by selecting the values of capacitors (C1 and C2 or resistances R3, R4 and R5. The resistance R7 serves to limit the collector current of the transistor T3 when the structure is powered by a 9V battery. When using a 4,5V power supply, the resistance R7 must be excluded, and the rest of the circuit leave it unchanged.
Fig. 1
As a relay P1, a relay RS-4 with a DC winding resistance of 200 Ohm was used. You can also use a relay of another type with a winding resistance of not more than 500 ohms, for example, miniature relays of the RES-9 or RES-10 type. The relay operation current should be no more than 30 mA. An elastic whip is attached to the anchor of the relay, which is also used in ordinary fishing rods.
The electronic part of the rod and the power supply can be placed in its handle or in a small box.
In the design, it is recommended to use transistors with a current gain of 20 ... 40. Instead of P14, you can use transistors like P15, P16.
The general view of the assembled rod is shown in Fig. 2.
Fig. 2
A properly assembled electronic fishing rod should consume no more than 30 mA.
Author: Yu. Viktorov
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