On Monday, 1 March 2021 at 10:12:40 UTC, Don Pearce wrote:
On Mon, 1 Mar 2021 20:58:52 +1300, geoff
wrote:
On 1/03/2021 8:43 pm, Don Pearce wrote:
On Mon, 1 Mar 2021 12:48:16 +1300, geoff
wrote:
On 1/03/2021 8:55 am, Don Pearce wrote:
On Sat, 27 Feb 2021 04:31:33 -0800 (PST), "
Since you won't get off your lazy arse and do the work, I've done it
for you. Of course I knew precisely what the result would be before I
started, but it was a boring Sunday evening so here goes.
https://youtu.be/-hQgI0eCO08
d
I think a spectrum analyser display would have been more relevant.
geoff
No it would not. The screen I showed illustrated perfectly that there
was no selective harmonic boosting going on. That would have resulted
in a beat walking through the ring. A rock-solid, edge-induced ring is
what I intended to show, and that is exactly what I did show. Now, how
about addressing the result?
d
I would be curious to see the oredrs of harmonics and if they altered
over freq.
geoff
I've taken an FFT showing all the harmonics up to and beyond the
ringing frequency. The harmonic at the ringing frequency is marked.
Make of it what you will.
http://www.soundthoughts.co.uk/look/ringing.gif
The ring itself is of very short duration so despite its amplitude, it
contains very little energy compared to the harmonics which are
continuous. That is why it won't show up in the frequency domain
(unless the Q is so high that it continues at considerable amplitude
all the way to the next excitation). To see such a low energy signal
you have to choose the appropriate domain, the one in which it can be
isolated. That of course is time. I'm really disappointed that I have
to go though these hoops - they should not be necessary for a
technical audience.
d
--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
These are screenshots of the Pultec clone ringing:
https://imgur.com/Ou0BGml
and with 100 Ohms in series with 0.01uF:
https://imgur.com/jaLv5Dz