This LED lamp uses only three transistors and only requires a voltage of 0.71V to start the LED to emit light. One No. 5 alkaline battery can allow the lamp to light continuously for 170 hours, greatl'...

This production is powered by batteries. After power is turned on, the system enters a waiting state. When someone passes by the photosensitive device, the light intensity received by the photoresisto'...

The figure shows the speaker protection circuit. It is designed for the left and right channels to work independently. In the figure (taking the left channel as an example), R2, C4, VT2, and VT3 form '...

The experimental circuit is shown in the figure. A 5.2Ω/5W resistor is used as the load. A 1KΩ LED is connected in series to indicate the on/off state of the switch. The normal operating voltage VCC=4'...

In the right figure, the input temperature control circuit is composed of a time control switch T and a temperature controller ZK. T is a G316T-2 type microcomputer time control switch, with an operat'...

When the power supply fails during the operation of the motor, the protection device should stop the motor from running. Common phase failure protectors are voltage type and current type. Based on the'...

TXl00 is an ASK wireless data transmitter module. It uses PLL frequency stabilization technology and is widely used in small area wireless data communications, such as wireless meter reading systems. '...

When a person touches the sensing electrode M1, a control signal is input to U1, and the trigger signal output by U1 (3) pin changes accordingly. The brightness of the bulb can change cyclically betwe'...

Because the improved circuit has superior anti-interference performance, the control can be installed in the common ceiling corridor light cover, leaving no trace on the outside and has anti-vandalism'...

In this tutorial, you'll learn how to make a FLEX sensor at home for next to nothing. The cost of this type of sensor in the market is very high, ranging from 60 to 200 yuan.

The constant current source circuit controlled by AT89C51 has the advantages of simple external circuit, less interference, and low price. This system is a digital voltage-controlled current source th'...

Basic amplifier circuit.

This article introduces a fluid media temperature controller that uses the principles of thermal expansion and contraction of temperature-sensing fluids and the incompressibility of liquids to achieve'...

Breeze block circuit using capacitor to reduce voltage