Design of dual-tone doorbell circuit based on 555 timer

Design of dual-tone doorbell circuit based on 555 timer

Schematic PCB

Design and implementation of MP3 player based on STM32 (MDK complete source code provided)

A design example of implementing a simple MP3 Player using an STM32 processor. This comprehensive application example helps readers understand the applications of STM32, SPI interface, SD card, TIMER, interrupts, FAT file system, USB, etc.

Schematic PCB

Four-channel radio remote control schematic diagram

Four-channel radio remote control schematic diagram

Schematic PCB

Design and production based on lithium battery charger_with schematic diagram and PCB

Since my four-wheel drive robot is powered by a 16.5V lithium battery, and there is no charger for this battery on the market, I am very confused about charging it. In desperation, we designed a portable and simple lithium battery charger. Solve the trouble of charging. The charger can output an adjustable charging current of 100mA-1A. The input voltage is VIN>18V, and it can be charged with the 19V voltage on the laptop. Charging time is generally determined according to the size of the charging output current.

Schematic PCB

PCA9450-EVK: PCA9450 Evaluation Kit

Schematic PCB

RDR-912 - 6.6W non-isolated buck converter for small appliances based on LinkSwitch-TN2

Schematic PCB

RDR-839 - 12W power supply for home appliances using TinySwitch-4

Schematic PCB

RDR-752 - 15W dual output power supply with 83% standby efficiency

Schematic PCB

RDR-737 - LinkSwitch-TN2 based 1.44W non-isolated buck converter 900 V

Schematic PCB

RDR-736 - 7W wide-range input, dual output, non-isolated flyback converter based on LinkSwitch-XT2 900 V

Schematic PCB

RDR-734 - 8.4W open frame power supply for home appliances based on LinkSwitch-3

Schematic PCB

RDR-506 - 1.44 W non-isolated buck converter based on LinkSwitch-TN2

Schematic PCB

EPR-9 - 5W, universal input, dual output, isolated power supply

Schematic PCB

EPR-8 - 1.2W, universal input, non-isolated power supply

Schematic PCB

DI-177 - 9W High Ambient Temperature Power Supply for Oven Control

Schematic PCB

DI-176 - 20W air conditioner power supply

Schematic PCB

DI-163 - Wide range set-top box power supply with latched overvoltage (OVP) shutdown protection

Schematic PCB

DI-162 - Set Top Box Power Supply

Schematic PCB

DI-154 - 3W low-cost and high-efficiency CV/CC charger

Schematic PCB

DI-144 - Condensing boiler power supply

Schematic PCB