| Electronics > Projects, Designs, and Technical Stuff |
| Weird signal instablity of an opamp amplifier |
| << < (4/5) > >> |
| SiliconWizard:
Have you tried putting your circuit away from potential noise sources? What's the set output impedance of your signal gen? |
| HB9EVI:
If you're not limited by the output impedance of the signal source, you should try lowering your system impedance; like 100k/1k |
| VanitarNordic:
--- Quote ---Have you tried putting your circuit away from potential noise sources? What's the set output impedance of your signal gen? If you're not limited by the output impedance of the signal source, you should try lowering your system impedance; like 100k/1k --- End quote --- The signal generator is the Siglent 1025. The output can be adjusted to 50ohm or High-Z. I swapped between these two options, but no difference |
| HB9EVI:
You cannot adjust the output impedance - this function only allows to have the reading of the signal level related to the system impedance - on the physical signal itself it has no influence |
| VanitarNordic:
I reached this conclusion also that this problem causes by the 50Hz mains hum. Thank you for all comments and contributions :-+ :-+ if there are some practical suggestions to minimize it, I would be glad to know since sometimes we have to deal with small signals and sensitive circuits |
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