Home time service. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Clocks, timers, relays, load switches
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Dreaming of equipping an apartment with a "talking" clock, he tried to assemble an acceptable design for himself using standard domestic microcircuits. But after I encountered the difficulties of "firmware" of electronic memory, I decided to adapt the TALKING WATCH wrist alarm clock - a cheap Chinese-made consumer goods - as the basis for my watch. The result is the proposed information system.
An important component of the apartment "talking" clock is a network of speakers and buttons that can be increased depending on the number of rooms. This makes it possible to receive information about the exact time, being in any of the rooms or even in the corridor.
Schematic diagram (a), amplifier printed circuit board (b) and base unit (c) of a home "talking" clock (click to enlarge)
Wanting, for example, immediately after waking up from sleep to clarify what time it is, press the SB1 button. Relays K1 and K5 are activated when receiving power. The first of them is instantly self-blocking (through normally closed K2.2, KZ.2, K4.2). With contacts K1.1, it connects to the output of an amplifier assembled on transistors VT1-VT4, a BA1 loudspeaker with a volume control R1. The non-self-locking turntable K5 by short-term contact closure K5.1 (INTERROGATION) already starts the TALKING WATCH speech synthesizer by this moment, and speech information about the exact time sounds in the bedroom. In the rest of the rooms, the speakers are silent.
It is worth going, say, to the kitchen, pressing the button SB2 installed there (in the hall - SB4, and in the corridor - SB1), like relay K5, if it is self-locking, it inevitably returns to its original state. But paired with K2, K3 is turned on (for other options - K4 or, respectively, KXNUMX).
The electronics are triggered - and the BA2 speaker (VAZ, BA4) gives out speech information about the time.
Home "talking" clock does not require debugging, convenient and reliable in operation. In addition, they look very aesthetically pleasing if the base unit is arranged in the form of an elegant box with a liquid crystal indicator screen displayed on the front panel, MODE, HR, MIN and TALKING reed keys, and wires stretching into each of the rooms (one pair for a button, the second - for the loudspeaker) hide under the plinth.
However, as you know, there is no limit to perfection. Home time service is no exception. It is possible, in particular, to improve its energy supply by replacing the built-in microbatteries in TALKING WATCH with more capacious remote ones with a total voltage of 3 V or with a network adapter that will provide power to both the amplifier and everything else with stabilized 5 and 20 V DC.
Author: V.Denisov
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