Amplifier Circiut Npn and pnp transistors built on 4.5 volts, an amplifier circuit is working with 3 alkaline batteries can be used with LED warning when the battery level drops gives 99s also prepared with protel pcb file available
Simple OTL Amplifier Schematic
Simple OTL Amplifier Circiut PROTEL2.8 pcb
Simple OTL Amplifier Circiut ZIP File Password: 320volt.com
PIC16C84 PICmicro Controlled Capacitance Meter Circuit
PIC16C84 and with other integrated circuits (74HC390, 4011, NE555) measuring devices with micro-controller can be an example to people who want to design pcb files available asm the schema
The Capacitance Meter has 4 ranges. In Manual Mode each range has an absolute minimum and maximum reading that corresponds to a count range from 0 to 16,777,215 counts. The extremes of each range are where the greatest error occurs, so in the Auto Mode we restrict the range to that portion where we will attain the greatest accuracy.