The buzzer from the Chinese clock. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Calls and audio simulators
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Currently, a lot of electromechanical watches are sold in the country's markets in the form of a variety of houses and parrots. As a rule, the manufacturer is not indicated on these devices. I take the liberty of asserting that in the shortest time after the purchase, the owner, at best, will give the "house" for children to play, as my friends did.
The clock caught my eye when I was thinking about which alarm clock to set in the next hours on the BIS KR145IK1901. In the aforementioned "house", the alarm clock emits a pleasant intermittent signal and is mounted on a board measuring only 32x16 mm. In general, having dismantled the board and carefully sawed off the battery compartment from the watch case, after a little refinement, I got a good signaling device.
The principle of refinement is clear from the figure.
In my case, a periodic ringing was observed, to eliminate which it is enough to install a capacitor C1 of the KLS, KM, KD types or any small-sized one. Structurally, the transistor T1 is installed on the clock board in pre-drilled holes, the base output is bent up. Resistor R2 (and capacitor C1) is soldered at one end to the VT1 base, and at the other end to the "negative" output of the board. The conclusions of the electromagnet should be unsoldered from the board. For convenience, I soldered the emitter to the opposite side of the board. Resistor R1 in my case was installed on the electronic clock board.
In standby mode, the call practically does not consume current (less than 0,5 μA), in operating mode - no more than 3 mA (from a 1,5 V battery). The alarm clock is satisfactorily audible when the power is reduced to 1 V.
Author: S.Polyakov, Narimanov, Astrakhan Region
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