Circuit diagrams and schematics - Electronic projects

This be Noise Filter Circuit for filter the frequency disturbs all well. By use base type equipment the FET transistor number 2N3819 and Electronic part The other a little again. It can be usable economize with. By the circuit will decrease frequency tall signal more 20KHz well. Then can apply in side sound circuit well [...]

circuit Noise Gate by BC109, to filter audio sound,by Fet & Transistor (BC109).