Just 30 minutes will it take to build a simple and reliable time switch that at a given point (in the range of 1-11 h) will switch on or off any home appliance power up to 0.5 kW. The device is made on the basis of a conventional mechanical clock, for example, “amber”, “Sevani”, “Ray”, in a plastic case of which a simple device consisting of two neon lamps T-0,3, a pair of resistors VS-0,25 or MLT-0,5, the micro-switch MP-1, socket for standard plug and fuse.
The principle of operation of the time relay is simple. The coiled flat spring tzonka the alarm of Moscow extends beyond the movement, until you hit a Cup call. This fact makes it easy to turn alarm clock to timer — is enough to remove the bell Cup, and in its place install a switch. Now the clock spring, releasing the stored energy, the outer revolution rests not in a Cup to call, and click on the “button” switch, which, in turn, complete the circuit power supply external device — tape recorder, radio, lamp, electromarket (safe hot plate with the temperature of the working surface of no more than 95 ).
Neon lamp V1 (Fig. 1) indicates the device is connected to the network, and V2 indicates a voltage at the sockets x2. Resistors R1, R2 limit the current through V1 and V2. S1 — micro-switch actuated by a spring clock. Fuse F1 protects the unit from possible short circuit.