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NE555: ne555 oscillator frequency question

Part Number: NE555
Other Parts Discussed in Thread: CD4040B, SN74LVC1GX04, SN74LVC1G80

Hi,

My customer is using NE555 for 50Hz oscillator output, but they found the frequency is swinging from 49.5Hz to 50.5Hz.

Pls check the schematic and waveform as below, thanks.