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Household appliance power timer circuit

Source: InternetPublisher:sigma Keywords: timer circuit household appliances electric timer Updated: 2020/10/28

13.<strong>Household Appliances</strong>Electricity<strong>Timer Circuit</strong>.gif

Circuit working principle: Integrated circuit IC 2, lC3 (CD4060) and surrounding components
form a timer, and both work on the same principle. IC2 acts as an "on" timer and IC, acts as
an "off" timer. CD4060 is a 14-stage divide-by-two serial counter with its own oscillator
. The square wave oscillator is composed of pins 9, 10, and 11 of IC2 and R2, R3, C4, etc. Oscillation
period r=2. 2R3. C4. After the power is turned on at 10:00 pm, pin 3 of ICz outputs
low level, VL is turned on, and K. Suction, K. 1: Closed, the socket (xs) is powered, and the timing
starts. At the same time, K, one, is disconnected, IC3 has no power and does not work. When the timer
reaches 6:00 the next day, pin 3 of IC: outputs high level, VT1 is cut off, K1 is released, and K. One: Disconnect,
the socket gets power. At the same time K. ,, close, turn on the power of IC3, pin 3 of IC3 outputs high level
, VTz is turned on, K2 is closed, l (2 normally closed contact is disconnected, and IC 2 stops working.


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