At present, the commonly used invisible anti-theft nets on the domestic market are mainly domestic brands, and there are very few foreign brands. Most of them use infrared or microwave detection to di'...

The doorbell circuit (see attached figure) consists of a power supply circuit, a switch circuit, a light control circuit, a music doorbell circuit and a power amplifier circuit. The power supply circu'...

The rotating mousetrap designed and made by me allows mice to enter from three doors and multiple directions. It uses infrared detection, is clean and sanitary, and has high mouse catching efficiency.

As shown in the figure, it is a frequency dividing circuit that converts 50Hz or 60Hz frequency into 1/60 frequency. Due to the high integration and multiple levels of CMOS, a CMOS integrated circuit '...

The forward and reverse resistance values ??are measured by using a multimeter with the R×1k or R×10k range to measure the forward and reverse resistance values ??of the bidirectional trigger diode. U'...

The main function of the drive circuit is to amplify the variable width pulse output by the pulse width controller as a drive signal for the high-voltage power switch device. The drive circuit general'...

This monitor uses a discarded micro-ampere meter as a refrigerator ammeter. It is divided into two gears when measuring current to expand the range of small currents. The large current gear has a meas'...

The system display circuit diagram of the electric bicycle speed and odometer composed of CD4076 and 74LS138. In the system, Y0~Y5 of 74LS138 is used to select MC14511 to drive LED display, Y6, Y...

As shown in the figure, it is the OPA660 common collector (common-C) amplifier circuit, G=1. (a) The figure is a discrete component common collector amplifier, Vos=0.7V; (b) The figure is a common col'...

As shown in the figure, the cable amplifier circuit composed of OPA660. The cable input signal VI is added to the 3rd pin of OPA660 after passing through the 150Ω base resistor and the 50Ω matching re'...

As shown in the figure, it is a 400MHz broadband differential amplifier circuit. The circuit consists of two parts: an input broadband differential amplifier composed of an integrated chip OPA660 and '...

As shown in the figure, use OPA237 to adjust the common mode rejection ratio. Connect the common mode voltage CMV to the Cr terminal, connect a voltmeter to the output terminal, and adjust the 200Ω po'...

In daily life, we often need to know the maximum values ??of some physical quantities, such as maximum wind speed, maximum water level, maximum temperature, maximum pressure, etc. These physical...

In audio circuits, the most commonly used output level display method is LED display. If digital display is added to the LED display, it will be more novel and unique. The principle of this display ci'...

The digital level display shown in the figure can display the volume level output by the audio amplifier in digital form. Since a single-digit display tube is used, the display level is 0 to 9.

The timing controller utilizes the "division" signal of a liquid crystal electronic watch, and after taking it out, it passes through a combination of a two-stage frequency division circuit to form a '...

This article introduces an electronic washing machine timing program controller made of a single-chip digital integrated circuit. It has the characteristics of timing, forward, reverse, and forward an'...

The following figure is a circuit diagram for producing 21-23kHz ultrasonic mosquito repellent. When the power switch SW is closed, the light-emitting diode VD indicates the working signal. The single'...

This is a typical triode amplifier circuit. There is no AC negative feedback. The input signal is added to the gate of the tube along the potentiometer RP. Through amplification, the screen loop gener'...

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°C, and if necessary, the temperature of '...