ElectroSuite.com – BC549C Condenser Microphone Pre Amplifier. This is a very simple preamplifier circuit for condenser microphone. This mic preamplifier also can be used for dynamic microphone.
This is Prepaid KWH Meter System based AVR ATMEGA8535 MicroController, can retain data tough there are disconnection from the eletric supplier (in Indonesia, called PLN – Perusahaan Listrik Negara). Completely with the 4×4 keypad and the microchip as the payment. Datas are entered by keypad and then read and divide by Microcontroller AVR ATMEGA8535.