From the simple oscillator using NE555 I posted before, we can make different wave signals. The simple oscillator produced a square wave signal in which the changes between 0 to 1 goes in an instant. To produce a different wave signal, we can put a passive filters to ‘shape’ the signal output. Passive filter consists a composition of Resistors and Capacitors in which they shave and cut the square wave output. In this post, I put a together an oscillator based on MK555 schematic which combine Square, Integrator, Triangle, Sine (S I T S – to make it easier :D) in one oscillator with various different passive filter.
C1 10nF C2 47NF C3 47nF C4 1uF C5 100nF C6 47nF C7 47nF C8 1uF C9 1uF
D1 1N4007 G1 9V Battery Clips IC1 NE555N S1 4 channel switch Audio mini jack out mono Q1 BC547 Q2 BC547
R1 1K R2 15K R3 4K7 R4 1K R5 10K R6 10K R7 10K R8 1M R9 100K R10 100K R11 1M VR1 20K VR2 50K
PCB Print (Inverted)
SITS oscillator 0.3 EagleCad Schematic File download: [>>link<<]
SITS oscillator 0.3 EagleCad Board File download: [>>link<<]