Tone Generator using 2N4891
This be Basic Tone Generator by UJT Transistor 2N4891 numbers. By it s can give with small-sized loudspeaker s have a voice electric loud bell moderately. The value of C1 be valuable a little for enhance the speed in the package and disgorge to load. In each round (Cycle) that get be sound frequency at shine depart a loudspeaker. By can fine sound frequency get with R2 - 100K the value Resistance low tall frequency. But if the value is Resistance the tall low voice frequency.
