Using 555 Oscillator for Measurement: Experiences & Ideas

AI Thread Summary
The discussion centers on using a 555 relaxation oscillator for measurement applications, particularly focusing on its output frequency stability at low frequencies. Participants inquire about the stability achievable with high-quality capacitors and temperature-stable resistors, as well as the potential for measuring a sigma tau diagram. Concerns are raised about jitter caused by voltage noise, especially with low amplitude signals, and the need for design strategies to mitigate this issue. The importance of consulting the spec sheet for detailed oscillator performance is also emphasized. Overall, the conversation highlights the challenges and considerations in utilizing 555 oscillators for precise measurements.
0xDEADBEEF
Messages
815
Reaction score
1
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?
 
Engineering news on Phys.org
0xDEADBEEF said:
How stable are these oscillators at low frequencies?
Have you checked out the spec sheet?
 
Thread 'Weird near-field phenomenon I get in my EM simulation'

Thread 'Weird near-field phenomenon I get in my EM simulation'

I recently made a basic simulation of wire antennas and I am not sure if the near field in my simulation is modeled correctly. One of the things that worry me is the fact that sometimes I see in my simulation "movements" in the near field that seems to be faster than the speed of wave propagation I defined (the speed of light in the simulation). Specifically I see "nodes" of low amplitude in the E field that are quickly "emitted" from the antenna and then slow down as they approach the far...
View full post »

Thread 'EMF (Electromagnetic Field) & EHS (Electromagnetic Hyper Sensitivity)'

Hello dear reader, a brief introduction: Some 4 years ago someone started developing health related issues, apparently due to exposure to RF & ELF related frequencies and/or fields (Magnetic). This is currently becoming known as EHS. (Electromagnetic hypersensitivity is a claimed sensitivity to electromagnetic fields, to which adverse symptoms are attributed.) She experiences a deep burning sensation throughout her entire body, leaving her in pain and exhausted after a pulse has occurred...
View full post »

Similar threads

555 timer, 50% duty cycle astable, run from 5V
Replies
38
Views
22K
How to Measure PCB Impedance and Component Coupling?
Replies
12
Views
2K
Finding the resonant frequency of this "discriminator" demod circuit.
Replies
2
Views
2K
Vacuum tubes and electronic oscillators
Replies
25
Views
4K
A Measurement uncertainty due to thermal noise
Replies
4
Views
2K
A Confused about noise power spectral density measurement
Replies
0
Views
1K
Can I do this with an oscilloscope?
Replies
34
Views
7K
Can Two Cheap SDR Radios Accurately Measure RF Noise Correlation?
Replies
26
Views
3K
Trying to buy a quality EM meter for low frequency measurements
Replies
4
Views
2K
Revolutionizing SMPS Efficiency with Innovative Pulsed Operation Technique
Replies
19
Views
2K

Hot Threads

Recent Insights

Back
Top