Intelligent access control system

Intelligent access control system, perpetual calendar display, remote control switch, door power failure, storage record of the number of people entering and exiting

Schematic PCB

4A CNC regulated power supply design

Two outputs: 1: 0-30V/4A 2: 5V/1.5A (fixed output) Voltage resolution 0.458mV, current resolution 0.076mA Voltage step 0.0073V, the actual 0.1V step adjustment reset circuit is Both 51 and AVR are compatible. You can't solder all four original components. You can solder the reset circuit according to which chip you use!

Schematic PCB