I can't answer that question from knowledge. Gas filled tubes (being
pedantic these indicator tubes are not nixies) are relatively slow
devices as ionisation and deionisation are a slow processes. My answer
would be that HF noise would be "ignored"; now someone who does know can
knock me down :-)
But if you are building a spectrum analyser with the bandpass filters
done in a micro, why do you need LPFs?
Or have I missed somthing? If you are going to use external filters then
you need one per band and they must be band-pass not low pass?
On 16/02/2015 18:16, Mihai wrote:
Thanks for the tips.
I would just like to understand the low-pass filter's cut-off
frequency. Do I have to get one for each band (frequency) or is it
"one-size-fits-all"? From the values I found around, R=10k =1nF, the
filter's frequency is 160Hz and I don't know to what extent this
applies to my problem.
Could it be that the low-pass filter suppresses any high(er) frequency
noise which might have a negative impact on the Nixies?
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