Modernization of watches Electronics 7-21-03. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Clocks, timers, relays, load switches
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Household clocks "Electronics 7-2103", produced by the Saratov JSC "Reflektor", have a very significant drawback. The sound signal of the alarm clock is turned off in them by a keyboard button of a very small size, which is extremely inconvenient to use. I propose to modify the clock in order to turn off the sound signal using a touch sensor.
The refinement scheme is shown in fig. 1. In the initial state, the transistor VT1 is open and does not interfere with the sound signal. When the alarm goes off, the user, touching the touch sensor E1, reduces its resistance to 10 ... 100 kOhm, which causes the trigger to fire on the elements DD1.2, DD1.4. The logical zero signal from the output of the element DD1.4 will go to the base of the transistor VT1 and close it, the sound signal will stop. The trigger DD1.2, DD1.4 will return to its original state after charging the capacitor C2 through the resistor R3 to the threshold of the element DD1.3.
The touch sensor is made in the form of four metal plates arranged parallel to each other. Two of them (for example, even ones) are connected to a common wire, and the other two are connected to the connection point of resistors R1, R2. For reliable operation of the entire device, the resistance of the gap between the plates must be at least 20 MΩ.
The plates are fixed on the watch case above the hatch for additional batteries. Beforehand, it is necessary to drill holes in the body, the diameter of which is determined by the size of the fastener of the plates (Fig. 2). The microcircuit is glued to the clock board with BF-2 glue next to the keyboard. The pins of the chip must be facing up. First, they must be bent so that their total height with the microcircuit does not exceed 6 mm. During installation, the outputs perform the functions of mounting racks. Mounting - mounted using any small-sized resistors and ceramic capacitors. The required capacity of the latter is achieved by connecting several elements in parallel. This device requires almost no settings.
If desired, the watch can enter the "wake-up" mode, that is, the supply of repeated sound signals within one minute. These signals will turn off the next time you touch the touch sensor. To implement the "boost" mode, you should reduce the value of the capacitor C2.
Author: A.Kapustin, Zheleznogorsk, Krasnoyarsk Territory
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