The timer of household appliances is mechanical and electronic clock type. The former has a simple structure, low price, and the disadvantage is that the time is short and the latter is long time, but the structure, the cost, the volume is also large. The socket, the digital frequency -frequency integrated circuit, the timing time can be long or short, the accuracy is also appropriate. The biggest advantage is that it is convenient to use and is suitable for timing control of various types of household appliances.

The principle diagram of the electricity is as follows

The core is a 14 -level frequency ICCD4060 with an oscillator. At the moment of power -on, C4 and R6 generate a sharp pulse to reset the IC, and the LED light flashes and destroys it in order to show the schedule. When the VCC is about 10V, T = 2.3r9xc5, the counter is incremental counting at the decrease of the clock. The data delay T is about 180 minutes. If the time is extended, the capacity of the C5 can be increased, changing the R9, and the frequency of the oscillator. Select the 7, 1, 2, and 3 of the circuit output in the circuit. The time of O is 12 seconds, 45 points in 1 gear, 90 points in 2 gears, and 180 minutes in 3 gears. After the time of time, the high level of IC's output is saturated. LED1 lights up, the high level is forced by VD5 to force the IC vibration, LED2 is extinguished, and it ends at a time.

This timing socket is more suitable for the use of rice cookers. If you open for 3 hours at work in the morning, you can cook the rice when you go home at noon. Electricity.

        Timing, it can be led by the constant closed contact of the relay J1. A switch is connected in series on the VD5. The single -time, circular time selection can be performed. After time to time and time, relay sucks and combines, and then disconnects after the timing time. This will continue, which is more suitable for loads such as electric blankets.

IC uses a CD4060, the transistor V is selected 9014, the light emitting diode is the ordinary type, the diode VD1-VD4 uses IN4007, the regulatory tube is 10V, the diode VD5 and VD6 use the IN4148 type, and the relay J1 uses HG4123, or the appropriate model.

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