Introduction to photoelectric isolation Optical coupler is generally composed of three parts: light emission, light reception and signal amplification. The input electric signal drives the light-emitting diode (LED) to emit light of a certain wavelength, which is received by the photodetector to generate photocurrent, and then output after further amplification. This completes the electrical optical […]
Category: Circuit Diagram
Electronic circuit design diagram of multifunctional signal generator
This production is a signal generator with integrated circuit ICL8038 as the core device. The chip can output square wave, triangular wave and sine wave at the same time, with large frequency adjustment range, small waveform distortion and strong practicability. 1. Power supply It is composed of transformer T, bridge stack, capacitors C1 ~ C4 […]
Circuit design diagram of preamplifier
As shown in the figure, the circuit is a high-speed photodiode signal conditioning circuit with dark current compensation function. The system converts the current from the high-speed silicon PIN photodiode and drives the input of 20 MSPs analog-to-digital converter (ADC). The device combination can provide spectrum sensitivity of 400 nm to 1050 nm, photocurrent sensitivity […]
Circuit design diagram of LC sine wave oscillator
In the electronic circuit, in addition to the electronic circuit for amplifying various electrical signals, there is also a need for an electronic circuit that can generate periodic signals without an excitation signal, which can convert DC electric energy into a certain wave shape without an additional excitation signal An electronic circuit with alternating energy […]
Design diagram of driving circuit of two-phase stepping motor
This paper introduces the design schemes of unipolar and bipolar driving circuits most commonly used in byg general series two-phase stepping motors, embodies the control method of two-phase stepping motors in principle, and increases the flexibility of driving circuit design of stepping motors. The unipolar and bipolar driving circuits of two-phase stepping motor adopt an […]
Circuit design of wireless transceiver module of smart home system gateway
Home gateway is the core component of embedded smart home system. The designed wireless transceiver module circuit is a part of home gateway. The principle and design method of the wireless transceiver module circuit composed of a single RF transceiver chip nrf0433. The designed wireless transceiver module circuit works in the 433MHz ISM frequency band, […]
Circuit diagram daily reading (5): calendar circuit diagram design of intelligent gateway system
Design of intelligent gateway of Internet of things based on ARM9 3.3 design of system calendar circuit intelligent gateway needs an accurate real-time clock to ensure accurate travel time of the system and normal timing in case of power failure. The PCF8563 calendar chip is selected to ensure the accuracy of the system time after […]
Design diagram of wireless communication hardware circuit based on ZigBee protocol
CC2420 is a 2.4GHz RF chip conforming to IEEE802.15.4 specification launched by Chipcon company, which is used to develop ZigBee devices and products for Pan networks such as industrial wireless sensing and home networking. Based on the smartrf03 technology of Chipcon company, it is made by 0.18um CMOS process, requires only a few external components, […]
Extended memory circuit diagram design
Stc89c516rd single chip microcomputer contains 1280 bytes of RAM data memory, which is enough for general applications. However, due to the use of RTOS real-time multitasking operating system in the system, it needs to occupy part of ram, and a large amount of data needs to be stored. The generation of LCD interface also needs […]
Typical circuit diagram of photoelectric isolation RS485
1、 Introduction to RS485 bus RS485 bus is a common serial bus standard, which adopts the way of balanced transmission and differential reception, so it has the ability to suppress common mode interference. When the communication distance is required to be tens of meters to thousands of kilometers, RS485 bus is the most widely used […]