This type of protector is mainly used in three-phase three-wire or three-phase four-wire low-voltage power circuits. When there is leakage current in the circuit or someone is electrocuted, a voltage '...

The whole circuit is shown in the figure. The voltage amplification adopts high transconductance, low noise and wide bandwidth single triode 6C16. Inductor direct coupling is adopted between 6C16 and '...

The author has made an adjustable thermostatic controller for an electric blanket, which can automatically keep the electric blanket within a certain temperature range, and the user can set the temper'...

A self-made light-controlled automatic switch (without delay) is made. The switch has few components, simple circuit and reliable operation. The circuit is shown in the attached figure. Working princi'...

This example introduces a microwave detection delay lighting lamp that uses the microwave radar detection module TX982 as the detection device. Its biggest feature is that the circuit working state is'...

As shown in the figure, it is an infrared monitoring wireless alarm circuit. The circuit consists of two parts: an infrared monitoring transmitter and an infrared receiving circuit, as shown in Figure'...

The signal generating circuit with variable rhythm can realize different types of alarms, and can also be used in toys, which is very interesting. The circuit principle is shown in the figure. This si'...

This example describes a circuit using a small microcontroller sensor module that has only three connections: 5Vdc, an RS-232 data output, and ground. A dedicated single voltage level translator...

The enhancement circuit shown in the figure can increase the high frequency component of the video signal, thereby enhancing the contrast of the TV image. It can also be connected between the output o'...

The RF2948B is a transceiver designed for direct sequence spread spectrum systems operating in the 2.4 GHz ISM band. It is suitable for IEEE 802.1lb WLAN, high-speed digital links, wireless home...

nRF903 is a transceiver chip that can be easily embedded in various measurement and control systems. It only needs an external crystal and several resistors, capacitors and inductors to form a complet'...

The measurement amplifier circuit composed of OP07 is shown in the figure below. In order to improve the power supply impedance of the integrated operational amplifier, the positive and negative power'...

The rated voltage of the timer is AC220V/50Hz, the maximum output current is 10A, and the maximum load power is 2200W. The actual drawing of the timer circuit is shown in the figure below.

The wireless microphone introduced in this article uses amplitude modulation (AM), has an operating frequency range of 525 to 1605 kHz, and is received by a radio AM medium band.

When the hand touches the metal sheet A, SK-6 triggers the flip, outputs voltage from pin 8, V is turned on, K is energized and closed, the power supply of the electromagnetic water valve is turned on'...

The battery is charged with a constant current, which is about one tenth of the battery's capacity when calculated in ampere-hours. That is, for a 4.5Ah battery, the charging current is about 450mA.

This simple circuit is used for liquid level alarm. It consists of two BC547 transistors (T1 and T2) and two 555 timer chips (IC1 and IC2). The circuit can be mounted on a common PCB board and sealed '...

　Industrial control and variable bias circuits often require a converter that converts voltage to resistance. But it is difficult to implement. A simple method shown in the attached figure is to use t'...

Using STK3048 to directly drive complementary high-power tubes. STK3048 has high operating voltage, wide dynamic range, precise differential input tube pairing, and constant current source loads at bo'...

This article takes a deep dive into protecting 5G macro base station tower amplifiers and advanced antenna systems from electrical hazards. 5G, the next generation of cellular communications, will del'...