An amplifier circuit based on Npn and pnp transistors is working with 4.5 volts 3 pcs pen battery can be used when the battery level is low, it gives a warning with led and there is also pcb file prepared with protel 99se
An amplifier circuit based on Npn and pnp transistors is working with 4.5 volts 3 pcs pen battery can be used when the battery level is low, it gives a warning with led and there is also pcb file prepared with protel 99se
