Using 555 Oscillator for Measurement: Experiences & Ideas

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SUMMARY

The discussion focuses on utilizing a 555 relaxation oscillator for measurement applications, specifically examining its stability at low frequencies. Participants share insights on the impact of high-quality capacitors and low-temperature constant resistances on oscillator performance. Concerns regarding jitter due to voltage noise and the need for a sigma tau diagram are also highlighted. The importance of consulting the 555 oscillator's specification sheet for detailed performance metrics is emphasized.

PREREQUISITES
  • Understanding of 555 oscillator circuit design
  • Knowledge of capacitor selection for frequency stability
  • Familiarity with low-temperature resistance techniques
  • Basic principles of signal measurement and noise reduction
NEXT STEPS
  • Research high-quality capacitor options for 555 oscillators
  • Explore techniques to minimize voltage noise in oscillator circuits
  • Study the sigma tau diagram and its relevance to oscillator performance
  • Review the 555 oscillator specification sheet for detailed characteristics
USEFUL FOR

Electronics engineers, hobbyists experimenting with oscillators, and anyone interested in precision measurement techniques using 555 timers.

0xDEADBEEF
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I am thinking of using the output frequency of a 555 relaxation oscillator for measurement purposes. The frequency would be related to my measurement signal.

How stable are these oscillators at low frequencies?
Any personal experiences would help.

How stable can you get then with good capacitors and low temp constant resistances?
Did anyone measure a sigma tau diagram on these things?

My experiment would have some build up time and when the 555 triggers some decay time. (actually not due to capacitors) The smaller the amplitude the better, but I am worried about the jitter due to voltage noise on the wire. Does anyone have design ideas?
 
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0xDEADBEEF said:
How stable are these oscillators at low frequencies?
Have you checked out the spec sheet?
 

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