This is PIC16F627A Datasheet as good PIC Microcontroller ICs, Work 2.0-5.5V,Running 0-20MHz,In-circuit serial programming,Program memory 1.75 Kbyte
Why use microcontroller. We can change the work easily. By changing the program working within the micro controller. Making it ease of design
This is a small motorola radio charger circuit, with automatic mode for the 9 nickel-metal hydride battery holder, if the battery is charged to 11 Volts.
This is many LED flasher circuit and with PCB layout using transistors astable multi vibrator as low frequency oscillator below more...
This is Simple automatic battery charger circuit, using the small SCR and relay is cheap and can use all battery size by input source.