用89C51做稳压直流稳压电源 详细说明在里面， 若有不明，可以发邮件给我哦。-with 89C51 do Regulators DC Power Supply elaborate on the inside, if unknown, it can be oh-mail to me.

24c02 eeprom interfacing with 89c51... AT24C02 is a two-wire serial EEPROM Atmel. 24C02 is an 8 pin IC and reads 8 bit data serially. Its memory size is 2KB. Pins 1- 3 are address pins which are connected to ground. Pin 4 is GND Pin 5 is SDA (serial