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.
This is First stereo tone control board for a electronic students, so small,easy to build all in one PCB ,cheap. use transistors, few parts so low noise
The peak hold vu meter circuit on 12 LEDs stereo system and use L1424 as main so easy to build with PCB layout to peak voltage detector