Bottom Left Switches changes the speed mode, utilizes different capacitors.
Low Freq Mode:
0.1456Hz - 2.95Hz
Med Freq Mode:
6.84Hz - 138.46Hz
High Freq Mode:
1456Hz - 29460Hz
1 NE555
1 NOT gate
R1 = 1k Ω
R2 = 4.7k + (0-100k pot) Ω
C_HF = 4.7nF
C_MF = 1μF
C_LF = 47μF
Freq Formula:
1.44
------------------- Hz
(R1+2•R2)C
