I have long dreamed of "talking" hour, but could not flash the ROM. So I used hand watch "TALKING WATCH" (Chinese production). The scheme of "talking" hours is shown in Fig.1. The time signal sounds I discover in every room and in the hallway. For this are dynamic head of BA1...BA4.
The amplifier is assembled on four transistors VT1 VT4.... Circuit switching (Fig.2) is assembled on the relay type REF 22. The circuit works. When you press the SB1 relay: 1, and their contacts is blocked through the normally closed contacts of the other relay (K4.2, short circuit.2, K2.2). Contact To 1.1, the loudspeaker is activated BA1 "Hall", and simultaneously, the relay K5 (but not locked). Contacts K5.1 turns on for a couple of hours. In selected room sounds the time signal. The other rooms are quiet. It is necessary to press the button SB2 (SB3, SB4) - closed relay K1 turns off and turns on the other (K2 K4...). In the bedroom in series with the vases you can put a variable resistor to decrease the volume (not shown).
Instead of the internal clock battery is better to put the two outer finger or others on the total voltage of 3 V. the power supply in any of the output voltages of 5 V and 20 V.
The disadvantage of the scheme is that at a certain point in the room need to cut the 4 wires (2 wires for the button, 2 for the speaker). It's best to use the telephone line cord (type "noodles") and hide it under the baseboard.
Author: V. Denisov; Publication: N. Bolshakov, rf.atnn.ru