This protection circuit can not only prevent under-charging and over-charging, but also automatically cut off the power supply if the charger does not switch the light for ten hours to prevent serious'...

When using an electric iron, since it has no safety protection device, if you are not careful, you will damage your clothes. For this reason, based on the YK3-50D 500W automatic temperature control el'...

This light-controlled street lamp uses CD4013 dual D flip-flop integrated circuit, which has a simple circuit structure, is easy to make, and works stably and reliably. 1. Circuit working principle Th'...

　This is a Class A power amplifier with an output power of 18W. The final stage adopts a current series negative feedback circuit (the bypass capacitors at both ends of the output stage self-sufficien'...

The speaker is composed of audio power amplifier IC-8002 as the core. Its internal circuit structure, pin functions and typical application circuit are shown in the figure below. 8002 is a bridge conn'...

About three years ago, Texas Instruments (TI) released the ADS1298 family of ECG/EEG analog front ends, designed to make the design of analog front ends for biopotential devices a little easier.

This voltage-stabilized power supply can generate 3V-12V DC voltage for laboratory use. The 220V AC voltage is stepped down and rectified into a 21V pulse DC voltage, which is filtered by a 470μF capa'...

Amplifier circuit designed with LM1876: This amplifier circuit is designed as a DC servo constant current amplifier, which is more pleasant to listen to than the voltage feedback connection. The outpu'...

The MAX1811 does not require microprocessor control, and the maximum charging voltage can be set by pins to 4.1 V or 4.2 V, with a maximum error of 0.5%. The MAX1811 battery charging current can be se'...

Sealed lead-acid batteries have significant internal energy losses which can be a serious problem. In some cases, the absence of a trickle charge current over a period of several weeks can cause the b'...

As shown in the figure, this is a microphone preamplifier with phantom power. When the "phantom power" switch is connected to 48V, a 48V DC voltage is provided to the microphone; when it is connected '...

The author used several electronic components and local materials to make an LED digital display, two-speed photovoltaic meter. The field test results are quite ideal. It can not only detect the inten'...

The watch battery tester described in this article uses a non-contact method to sense the driving pulse of the second hand of an electronic watch. It can quickly and easily determine whether the batte'...

In the application of three-phase AC power supply, if one or two phases have low voltage, and you still want your single-phase electrical equipment to work with normal phase voltage, the circuit intro'...

This is a kit to solve the problem of reversing. The kit uses ultrasonic waves that are inaudible to human ears to measure the distance between the obstacle and the car. We install the sensor at the r'...

Here we introduce a circuit composed of triggers. By operating the key for a certain length of time, a single key can be used to realize the dual functions of power on/off. It can be used in many smal'...

A signal light composed of NE555 can work normally without any debugging as long as the wiring is correct. Adjusting VR1 can change the flashing frequency.

The MC14574 voltage comparator is used to form a Schmidt comparator. The inverting input plus the charge and discharge circuit form a multivibrator, as shown in the figure below.

This is a schematic diagram of the automatic 9V battery charger circuit, the parts list is provided below the schematic. Although this battery charger circuit looks very impressive and may be a bit co'...

TDA2005 is a dual-channel audio power amplifier integrated circuit that operates on a single power supply. It can be used in OTL dual-channel power amplifiers and can also be connected to a BTL bridge'...