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Figure (a) illustrates an infrared emission circuit composed of a 12-key keyboard and an S2559. Figure (b) displays a DTMF decoder circuit along with a channel control circuit utilizing the MT8870. Figure (c) presents a voltage amplifier circuit constructed...
The resistor-capacitor network R1-R2-C1 generates a ramp-type reference voltage that is superimposed on an adjustable DC voltage controlled by the speed-setting potentiometer R2. This reference voltage, available at the wiper of R2, is compared against the residual counter electromotive...
The circuit operates as a light-activated switch that controls white moving lights. It features high sensitivity, stable performance, and good anti-interference characteristics. A photosensitive resistor (RI) is employed to detect ambient light levels. During the day, the resistor exhibits...
A phase-controlled triac (HT-32) circuit offers control over the effective voltage at the load. It is important to include LI and C4, as they are essential for RFI suppression. The maximum load capacity is approximately 500 W. WARNING: 120...
AC contactor controls suction units, with the motor activated simultaneously. A pair of contacts (CJ1) short-circuits the thyristor (SCR), turning it off. The contactor (C) is influenced by the diode's DC voltage. In the positive half-wave power cycle, the...
The circuit operates as follows: When the momentary switch S is activated, the voltage across the capacitor cannot change instantly, resulting in zero voltage across the SCR, which does not trigger. Consequently, the voltage cut-off occurs. In this scenario,...
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