As shown, the long-term natural wind circuit includes an oscillator, a counter, a decoder, and a wind speed control circuit. Used for sleep timing and simulating natural winds.
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IC1(555) and RPl, R1, R2 and C form an astable multivibrator, f=1.44/(RP1+R1+2R2)C, which can change the oscillation frequency by changing the range of C and adjusting RP1. A pulse square wave of about 0.25 Hz, 0.5 Hz, and I1z is used as the count clock of IC2. IC2 uses a 12-bit binary serial counter/divider. Press the AN reset switch after power-on, clear 0, then start counting, Ql, Q2, Q3, Q4 will send the counting pulse to IC3. IC3 is 4-bit latch / 4-16 line decoder CD4514, then its Q0~ Q15, sequentially outputs high-selection pulses, and respectively charges C3 through current limiting resistors R4 to R19. The BT33 single junction transistor and the transformer T form a sawtooth wave trigger circuit whose oscillation pulse controls the conduction angle of the SCR. The value of R4 to R19 is between lk and 300KΩ. If R is small, the charging rate of C3 is high, the conduction angle of the output control SCR is large, the motor speed is fast, the air volume is large, and the R is large, the air volume is small. IC2 continuously counts the input clock pulse. Q12, Q11, Q10, and Q5 are 1111. The 4-input NAND gate is switched from the high level "1" to the low-power "0". The 555 is forced to reset and the oscillation is aborted. Corresponding to the K1 range 1, 2, 3, the preset timing of 1, 2, 4 hours is obtained. Transformer T uses a small radio input transformer, the primary is wrapped with a 0.1mm enamelled wire around 600åŒ, and the secondary is wound around 1200åŒ.