At present, the speaker protection circuit using separate components basically adopts two circuits as shown in the above figure and the middle figure. The main working principle of this circuit is to '...

If the automatic power-off switch introduced in this article is installed, the electrical devices will automatically be in a power-off state when the power is restored after a power outage. Only manua'...

The alarm can detect infrared rays emitted by the human body. When a person enters the monitoring area of ??the alarm, an alarm will sound. It is suitable for important places such as homes, offices, '...

The overheat alarm is a very useful alarm instrument that will sound an alarm in the event of overheating. The overheat alarm sets its alarm point at about 150'℃ if necessary. ...

This circuit is directly connected to the city, so you must pay attention to your own and others' personal safety. The electronic rodent killer introduced in this article uses infrared light reflectio'...

The figure shows the LM4903/4905 differential input audio amplifier circuit. The audio signal is input to the IN terminal and the -IN terminal in a differential form.

ISO120/121 is a precision isolation amplifier with a novel duty cycle modulation-demodulation technology. When sending signals, the digital signal passes through a 2pF differential capacitor isolation'...

As shown in the figure, it is a precision current inverter/current source circuit composed of LOG101/104 and op amp OPA2335. The input current of LOG101/104 can only be positive current, that is, the '...

As shown in the figure, there are two voltage sources (2.5V and 5V) inside the XTR106 to provide excitation, so it can adapt to a wide range of bridge values ??and can operate at less than 1kΩ without'...

The hardware interface diagram of CH375 and AT89S52 is shown below. D7~DO of CH375 chip is connected to the data line of microcontroller. RD and WR pins can be connected to the read strobe output pin '...

The figure shows a delay circuit with a fixed frequency division coefficient. The circuit is composed of a 60-frequency divider 74LS57 and a D flip-flop 7474. The 74LS57 has an independent 6-frequency'...

In this article, we will introduce SBR, explain its characteristics, and discuss how it can be used in an example application of automotive daytime running lights.

Recently, I used a damaged FM head to make an FM transmitter. It is very interesting, so I made a close-up to share with you.

The infrared thermometer circuit with multiple MLX90614 connected on the SMBus interface is shown in the figure below, using a 3.3V power supply voltage. The MLX90614 supports a 7-bit slave address in'...

The light-controlled timed voice advertising light box adopts the working mode of light-controlled opening and timed closing. During the working period of the advertising light box, the light color ca'...

The figure shows a simple audio amplifier circuit. The audio amplifier composed of an integrated operational amplifier has stable operation and is easy to add negative feedback, so it is easy to obtai'...

After research, the author believes that by adding a few small parts to this type of flashlight, battery charging protection can be achieved, greatly extending the battery life.

The principle of the power amplifier circuit is shown in Figure 1. The figure shows the circuit of one channel, and the other channel is exactly the same. V1 constitutes the input voltage amplifier st'...

Figure 1 shows the typical structure of a buck and boost converter white LED driver circuit. The white LED adds a series resistor R, which determines the current through the LED. The resistor value de'...

The figure below is a simple laser constant current drive circuit. By adjusting RP, the drive current can be adjusted. According to the circuit below, the maximum drive current can reach 1A.