Simple 555 oscillator circuit


A simple 555 oscillator circuit that produces a square-wave oscillation, with a 50% duty cycle. The that can be simple 555 oscillator circuit operates at can be adjusted by altering the R1 and C1 values as shown in the table.

Frequency R1 C1
3.7kHz 10k 100n
23kHz 1k 100n
27kHz 10k 10n
112kHz 10k 1n
115kHz 1k 10n
505kHz 1k 1n

Components Required

1 x 555 timer

1 x 200nF capacitor

1 x R1 resistor (as selected from table)

1 x C1 capacitor (as selected from table)