Complete circuit diagram of 9011 transistor switch

Circuit diagram of 9011 transistor switch (1) So far, we have assumed that there is a complete short circuit between the base and emitter when the transistor switch is on. This is not the case. No triode can be completely short circuited to make VCE = 0. Most small signal silicon triodes have a saturation […]

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A novel LED lighting dimming circuit based on SEPIC architecture

1. Introduction Due to the global energy shortage, energy conservation and sustainable development has gradually become a hot topic. LED has the characteristics of energy-saving, environmental protection, long life, fast response, etc., and gradually replaced the incandescent lamp. Many occasions need to use dimming technology, such as car taillights, building lighting, etc., with the widespread […]

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How to connect the forward and reverse direction of small motor

Small motor With power, a small machine is installed in front of the output shaft of a vertical ordinary motor (single-phase or three-phase asynchronous motor), which constitutes a small motor. Its main function is to decelerate and increase force. In fact, the small motor is also a gear reducer, but its power is relatively small, […]

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Driving circuit diagram of MOS transistor H-bridge motor

H bridge is a typical DC motor control circuit, because its circuit shape is similar to the letter H, so it is named “H bridge”. Four triodes form the four vertical legs of H, and the motor is the horizontal bar in H (Note: the diagram is only a sketch, not a complete circuit diagram, […]

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Complete circuit diagram of gas sensor

Gas sensor (also known as gas sensor) is a kind of electronic device which is very sensitive to some oxidizing gas, reducing gas and organic solvent vapor in the environmental atmosphere. It is widely used in the detection, leakage detection, alarm and monitoring of combustible gas and toxic gas. A complete gas sensor is composed […]

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Detailed explanation and application of gate circuit

Introduction of gate circuit The unit circuit used to realize basic logic operation and compound logic operation is called gate circuit. The logic function of the commonly used gate circuit includes and gate, or gate, not gate, NAND gate, or not gate, and or not gate, XOR gate and so on. Principle of integrated circuit […]

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Complete circuit diagram of light and sound control lamp

Sound control lamp The lighting circuit of light control lamp is shown in Fig. 1-1-8. The 220 V AC voltage is reduced by capacitor C1, the rectifier bridge stack ur is rectified in full wave, the capacitor is filtered by C2, and the stabilized diode is stabilized to DC voltage. The resistance of the photosensitive […]

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What is a time base circuit_ The function of time base circuit

Brief introduction of 555 time base circuit Time base integrated circuit 555 is not a general-purpose integrated circuit, but it can make up hundreds of practical circuits. It can be said that there are endless changes, so it is very popular. 555 time base circuit is also called 555 integrated circuit or 555 timer. In […]

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