The circuit shown in the figure below can detect the breakpoint location conveniently and quickly, and is suitable for single-core, 2-core and 3-core power cables. The circuit mainly uses a CD4069 six'...

The contactless refrigerator protector has few components, low cost, small size, no need for debugging, and uses bidirectional thyristors instead of relays. Working principle The protector circuit is '...

The circuit is shown in the figure below. When any phase in the three-phase circuit is disconnected, the balanced star point is broken, the small relay J is energized and attracted, and the external c'...

The author has designed a very simple constant temperature control circuit (as shown in Figure 1), which uses few parts and is easy to install and operate. The temperature sensor K is made from the ne'...

CD4511 is a BCD-seven-segment LED latch/decoder/driver. When LE is low, the data added to the A, B, C, and D terminals are translated into segment drive signals, which are then...

In some electronic products or in their production experiments, dual power supply is required. For example, a control board with a single-chip microcomputer, an LCD display or other peripheral devices'...

The figure shows a three-way frequency division circuit with symmetrical output. When a conventional counter is used to divide a digital pulse by an odd number, even if the input is a symmetrical sign'...

Temperature control is a widely used automatic control, which can be found in industrial and agricultural production and daily life. However, many temperature control circuits are relatively complex a'...

In modern homes, due to limited conditions, bathrooms, dining rooms or living rooms cannot be illuminated by natural light, and lights must be turned on during the day. After practice, a product that '...

As shown in the figure, this is an inverting unity gain amplifier circuit composed of LM1877. The audio signal is coupled through a 0.1μF capacitor and a 100kΩ resistor and added to the inverting inpu'...

As shown in the figure, the division circuit, A1 forms a voltage-controlled current source, A2 is a voltage comparator, and A3 forms an active low-pass filter. When the time constant R1C1 is equal to '...

As shown in the figure, the circuit uses a voltage source VREF to drive the excitation sensor bridge. This is a good excitation method. The excitation voltage VEX = VREF (1 R1/R2), where VEX is the vo'...

The main features of this machine are: 1. The frequency is relatively stable, because it is a multi-stage amplification circuit, unlike a single-tube circuit that uses the same circuit from oscillatio'...

The RS-232 serial interface circuit is shown in the figure below. It is mainly used for communication between PC and single-chip microcomputer. Here, the 2nd, 3rd and 5th pins of the serial port are n'...

The attached figure shows a current/voltage conversion circuit using a current converter. The current sensitivity is set to 10mV/lmA. This current detection circuit has the characteristics of high sen'...

To generate electricity using solar energy, the following conditions must be met: 1. Photovoltaic panels that convert solar energy into electricity; 2. Batteries that store electricity; 3. The best ch'...

This thermostat can not only indicate the temperature, but also has quite flexible temperature setting and perfect time-delay protection function. It is used to replace the damaged mechanical thermost'...

The figure shows the 12-bit A/D conversion system circuit of AD585. AD585 has a fast sampling time, so it can be used in multi-channel data acquisition systems to complete high-frequency signals and..'...

This flash circuit uses a single driver transistor (transistor) and the flash frequency is determined by the self-flashing LED.

This is a constant current and constant voltage lithium battery charging control board. In the figure, Q1, R1, W1, and TL431 form a precision adjustable voltage stabilization circuit. Q2, W2, and R2 f'...