E-RODHard for the uninitiated to understand anglers who sit all day, as if hypnotized, with a fishing rod, not taking his eyes off the float. Of course, patience in the end lost even the most avid, especially if the fish are not often pleasing bites. Therefore, many experimenting, testing in practice, various devices, signaling a bite. Considerable help in providing electronics. An example of this is a simple electronic device which allows you to monitor from up to four fishing rods — the bite on any of them will notify you of the light and sound signals. Indicator can be use by fishing from the shore, from boats and off the ice, determining the time of the bite to any of the four fishing rods in the evening and at night, and stay at some distance from the place of fishing.
The principle of the indicator is simple. On the rod in the vicinity of the coil is attached to the sensor (Fig. 1), that the bite angle of the line closes the contact pair comprising the power electronic devices, lights the corresponding lamp, and at the same time a tone sounds.
Fig. 1. Snap-in rods.
Fig. 1. Snap-in rods.
The design of the sensor can be varied. For example, suitable switches are the type of MP5, МП3А or closing of any contact pair from the relay. In an extreme case, the sensor is easy to make yourself. To do this, take two elastic metal (e.g., bronze) plate with a length of 50-80 mm and a width of 5 mm. From one end they drilled holes Ø 2 mm for the copper rivet, acting as a contactor. In the same place to the top plate of the sensor is soldered a small ring for a transmission line. From the other end in plates drilled holes Ø 0,8—1 mm for connection of connecting wires, and then, departing from the end of the 10 and 18 mm, drill two holes Ø 3 mm for fixing screws. The site is going with the use of insulating pads of the PCB or Micarta, the thickness of which depends on the gap between the plates. During Assembly in the mounting holes injected insulation tube (cuts the rod of a ballpoint pen), and insert the screws, with which the sensor is attached to a mounted on the rod bushing. Instead, you can use metal brackets, clamps, etc.
The electrical circuit of the indicator (Fig. 2) economical, it does not contain scarce parts, and because it can be repeated by any new ham. The generator of a sound signal collected by well-known scheme for two transistors of different structure: VT1 — any series МП39—МП42, VT2 — series MP35—MP38, KT315; diodes VD1-VD4 type D2, D9 with any alphabetic index; resistor — MLT or any power of 0.125 W, a capacitor — MBM, the dynamic head of BA1 — any brand with capacity 0,1—0,25 W incandescent lamp HL1 — HL4 2.5 V (0.15 A) – flashlight; power source – three elements РЦ53 or the battery voltage of 4.5 V; connecting wire mgshv-section of 0.2 mm2.
Fig. 2. Schematic diagram of the alarm device.
Fig. 2. Schematic diagram of the alarm device (elements XP1-XP4, SA1-SA4 are mounted on the rod).
The indicator is assembled in a plastic case the size of 110Х68Х37 mm, for example, from a pocket radio (see photo). The location of the elements within the housing shown in figure 3. Dynamic head is attached directly to the lid, in which holes are drilled for the passage of sound. In the lid are drilled four holes against the indicator bulbs; they are closed by transparent plates of Plexiglas or polystyrene. To eliminate the influence of light of adjacent lamps, isolate them opaque partitions, such as tin or in paper tubes, placed the tubes of the lamps.
Appearance of the alarm device.
The appearance of the alarm device.
Fig. 3. The arrangement of the elements in the body of the instrument.
Fig. 3. The arrangement of elements in the unit.

To reduce the size of the device, everything except the bulbs and connectors can accommodate in the space below the diffuser to the dynamic head.
To connect sensors with indicator better through connectors used to connect phones to small transistor radios. When fishing from a boat and from the ice, connecting wire must have a length of 1.5—3 m, when fishing from shore it can be increased to 10 m.
The indicator requires no adjustment and proper installation begins working immediately. However, you should adjust the gap between the contact plates of the sensor. It is known that in the winter the fish takes the nozzle more sluggish than in the summer, and that big fish bite more vigorously than small ones. Based on this, and select the size of the gap between the contacts.
S. MALINOVSKY, Yoshkar-Ola

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