Bite alarm. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Home, household, hobby
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Fishermen are well aware of how difficult it is to keep track of bites on an elastic band or bottom. And if there are several of them, then even more so. As a rule, in such cases, bells are placed as a bite signaling device. But on night fishing it's hard to tell which bell is ringing. And night fishing is the most interesting and "profitable". Another option is when you take a few fishing rods and an elastic band with you. You direct all your attention to the floats of the fishing rods (even though it is small, but it bites!), And it is difficult to keep track of the rubber bands. I offer a variant of a bite signaling device with sound and light indication. The alarm time can be set up to 5 seconds. The signaling device circuit is shown in Figure 1.
(click to enlarge)
The signaling device is assembled on one microcircuit and functionally consists of two blocks. On the elements DD1.1 and DD1.2, a waiting single vibrator is assembled. The frequency-setting circuits of the single vibrator are the capacitor C1 and the resistor R2. With a capacitor value of 0,47 microfarads indicated on the diagram, the duration of the sound and light signal will be 1 second. By increasing the value of the capacitor to 2,2 microfarads, the duration will increase to 5 seconds. You can put different denominations on the signaling devices and determine by ear which gum is biting. True, if the fishing line is pulled, then the sound signal sounds continuously. A positive pulse of the waiting single vibrator starts the waiting multivibrator, assembled on the elements DD1.3 and DD1.4. The frequency-setting elements of the multivibrator are the resistor R3 and the piezoelectric element ЗП1. The multivibrator is excited at its own resonant frequency of the piezoelectric emitter. For a dozen assembled circuits with a ZP1 piezoelectric radiator, it was not necessary to select a resistor. If another piezo emitter is used, then it may be necessary to select a resistor for maximum volume. The zero potential of the waiting single vibrator turns on the HL1 LED. You can put any LED, but an LED with a diverging lens is better.
In standby mode, at the inputs 5,6 of the element DD1.2 there is a logic zero level, at pin 4 - a logic one level. LED HL1 is off. At the inputs 1,2 logic element DD1.1 high levels. Pin 3 is a logical zero. Capacitor C1 is discharged and the multivibrator does not work. When biting, switch SA1 closes and starts the waiting single vibrator and the waiting multivibrator. The capacitor C1 of the integrator will begin to recharge to a logic zero level at pins 5,6. The recharge time of the capacitor determines the duration of the single vibrator pulse. This means the time when the sound and light signal is turned on.
The signaling device is powered by 3-4 elements of the A10-A13 type. It is good to make a case for elements from the body of a disposable 5 ml syringe. The current consumption in standby mode is negligible (less than 1 microamp), so the power switch can be omitted. It is only necessary to ensure that in the transport position the lever does not close the switch. The printed circuit board of the signaling device is made of one-sided fiberglass. The topology of the board with the layout of the elements is shown in Figure 2. In practice, the size of the board must be increased by the size of the SA1 pushbutton switch. Since you can put miniature switches like MP-7 or larger switches like MP-3, MP11. Everything depends on "presence". The approximate location of the switch and the board is shown in Figure 3.
The lever for closing the switch is made from a soft plate from a large relay. The contact on the plate is pressed out, and a fishing line is inserted into the hole. The fishing line is wound on a match and stretched. The sensitivity of the bite alarm can be changed by increasing the length of the lever or by pulling the line. A strong wind or a wave for such a signaling device is not a hindrance. The signaling device is installed inside the box with the output of the lever and LED. The box is attached with screws to a stick with a pointed end.
Publication: cxem.net
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