My ears leave something to be desired these days... Singing? What singing!
OK. My wife and animals hear it. It's real.
I use a small microphone and PC based spectrum analyzer to explore sounds I
can't hear. The mic is at the end of a bit of heat shrink tubing close to a
preamplifier on a
I used an app called SpectrumView which gives a nice plot of freq against
db. It shows a mess of noise below 4Khz, I think I would need a really
quiet room to get rid of that.
With no dimming/fading there are noticeable peaks at 4KHz, 8KHz and 12KHz,
12KHz is the upper limit of the frequency
Can you put a microphone up to the tube and look at the sound on a scope
while you also scope the anode voltage via an adjustable low pass filter,
or perhaps an adjustable a band pass filter, if so you might see where the
frequency comes from?
/Martin
--
You received this message because you
The PWM definitely causes the power supply to sag in my clock too. The output
voltage also briefly sags, but quickly pulls itself back. As I mentioned,
removing, or lessening the ripple has no appreciable effect.
> On Feb 23, 2019, at 2:59 PM, Terry Kennedy wrote:
>
>> On Saturday, February
On Saturday, February 23, 2019 at 7:22:59 AM UTC-5, Paul Andrews wrote:
> None of my other tubes exhibit this behavior (with a caveat I will get
> into in a moment). My theory on this was that the large cathodes on the
> CD47 could vibrate at lower frequencies than any other tube in my
>
The 'singing Nixie' in and of itself won't produce RFI on the A.M. band.
The RFI will come from the electronics, including the elements of the
Nixie tube radiating RF from the signals being applied to them, and
would probably be plentiful especially in close proximity to the radio,
unless very
Does it also produce RFI on the AM band? My 6-digit B-7971 clock sings and
produces RFI at the MUX rate
--
You received this message because you are subscribed to the Google Groups
"neonixie-l" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to
