Experiments have shown that the output terminals of the TDA2822 power amplifier integrated circuit ④ and ③ can be directly connected to the speakers, which can also improve the sound quality in the lo'...

If a soft starter is used to control a motor, the motor M2 in the figure below can be cancelled. The secondary control circuit composed of KM1, KM2, etc. is shown in the wiring diagram of a soft start'...

For squirrel cage asynchronous motors above 10kW, their large starting current (5 to 7 times the rated current) will have a huge impact on the power supply system, so they are generally not started di'...

In response to this situation, the author used a few simple electronic components to make a short-circuit alarm device, which can easily check this kind of fuse-related circuit fault, and these electr'...

The circuit diagram of the device is shown below. The control switch is located in the broadcast control room at the bottom of the mountain, and the rest of the settings are located in the shooting ro'...

Here we introduce a novel photosensitive gas alarm made using a music greeting card sound piece. It requires few materials, is simple to make, and consumes little power. Generally speaking, as long as'...

When K1 is just connected, KZ is powered on, C2 has a very low voltage, BG is not conducting, and the relay is closed. When C2 is charged to a certain level, BG is conducting, SCR is conducting, the r'...

As shown in the figure, this is a frequency division circuit composed of a TTL decimal counter. In many cases, it is necessary to divide the pulse sequence by N (N is an integer). For example, a digit'...

Since the water temperature display is relatively simple, you can directly purchase a digital (or pointer) temperature controller. Since the boiler's induced draft fan is controlled by a frequency con'...

The RX3310A module is a receiving module specially used for ASK-modulated wireless remote control and data transmission signals. The module uses a high-performance wireless remote control and data tra'...

AN7113S is an audio power amplifier circuit, which adopts 10-pin dual-in-line flat package, and the working power supply voltage range is 1.8~4.5V. The circuit has few external components, and its qui'...

The figure below shows a 100ms timer circuit composed of a monostable trigger. Using the TR+ input terminal to trigger, each time sB is pressed, the output terminal Q outputs a high-level signal with '...

The device uses the on and off of the light path to control the switch of the light, and adds a delay circuit to improve the stability and practicality of the light-controlled switch.

When the 18V input voltage is added, the series power tube TIP42C is turned on and starts high-current constant-current charging. The charging current is 500mA. At this time, the charging current rema'...

The circuit uses very few components, only 4, to form a miniature wireless FM microphone, with a relatively stable operating frequency, a transmission distance of more than 10 meters, and a current of'...

The author made an electronic starting circuit, which can light up the fluorescent lamp even at low voltage. It is very convenient to use. It not only lights up immediately, but also prolongs the serv'...

The circuit shown in the attached figure is a permanent magnet DC motor speed control circuit. The sawtooth voltage is compared by IC1 (1/2 unit of LM358 dual op amp integrated circuit), and a square '...

The figure below is a schematic diagram of a 12V NiCAD battery charger with a charging rate of 200mA/Hour. This NiCAD battery charger circuit charges the battery at 75mA until the battery is fully cha'...

The battery management system refers to a system used to manage the battery, that is, to manage the charge and discharge of the battery to keep the battery in an optimal state. It consists of multiple'...

The drive circuit is a dedicated pulse width modulation oscillator SG3524. Because it has few peripheral components and is simple to manufacture, all components can be welded on the periphery using th'...