Ok, I'm back. Been busy with work.
I managed to purchase a Teensy 3.6 and I have the scope clock
running. For some reason, I am not able to get a crisp picture,
no matter how much I try to balance focus vs astigmatism vs
brightness.
Could it be that my hand-wound transformer is creating some
noise? It's quite a complex transformer (at least for me). I
guess I could check the voltages with the oscilloscope but I
worry that I accidentally put 1200V on the oscilloscope. I'm
using the schematic published by David at Cathode Corner, I built
the transformer by trial and error. For the heather I'm using a
stabilised 6.4VDC using a buck-converter, which I thought should
help, but no!
Any suggestions on how to stability the picture? Attached a
couple of photos.
Il giorno lunedì 10 luglio 2023 alle 16:54:15 UTC+1 gregebert ha
scritto:
Sounds like the CRT-related stuff is fine (congratulations,
BTW), and you have issues with the DAC. Have you checked the
linearity of the DAC ? The best way to start is to run all
DAC codes, starting from 0 and incrementing to the top, and
verify the waveform is a stair-step. I suggest leaving each
value for about 10usec to allow more than enough time for the
DAC and amplifiers to settle. Which DAC are you using ? My
only experience is with 8-bit parallel-input DACs, and I had
no problems with it (ADCs, on the other hand, are a different
story....). If you see erratic behavior, post the findings
and we can figure out next steps.
If the DAC is operating correctly, then my first suspect is
the range/offset of your DAC. You might not be able to drive
it rail-to-rail due to the design of the
level-shifters/deflection amps. In that case, try to
narrow-down the range where the DAC is driving the CRT
as-expected.
On Sunday, July 9, 2023 at 3:42:21 AM UTC-7 Max Di Noi wrote:
Hey, Adrian, let me knew if you find that Teensy 3.6.
I'm not having much luck with a teensy 4.1 + external DAC
using SPI. Nor I can see any issues at all in the code.
The connections are simple enough but it cannot draw a
circle (as a test) on my CRT using the open source code
that Cathode Corner published. Indeed, when I test the
DAC output on the oscilloscope looks irregular, whereas
the SPI lines seems to behave as expected. Odd.
If I input two sine waves into the deflection amplifiers
using my signal generator, then I can get a circle on the
CRT, that proves that power supply, level shifters and
deflection amplifiers should be fine.
-------- Original message --------
From: Adrian Godwin <artg...@gmail.com>
Date: 10/06/2023 17:17 (GMT+00:00)
To: neoni...@googlegroups.com
Subject: Re: [neonixie-l] ScopeClock with teensy4.0
I think I have an unused teensy 3.6.
It may take some time to track it down but I'd happily
swap it for a 4.1 if that simplifies things for you.
On Sat, Jun 10, 2023 at 5:03 PM David Forbes
<nixie...@gmail.com> wrote:
Here is the schematic of the SCTV rev E, which uses
the Teensy 4.1.
On Sat, Jun 10, 2023 at 8:51 AM Max Di Noi
<flata...@gmail.com> wrote:
Thanks for your prompt reply David.
I have already printed my board for a Teensy 3.6.
I have no issues soldering tiny smd components
assuming that I can get an LTC22632! I may design
a small PCB to super-impose the Teensy 4.1 over
the existing footprint and layout. In doing so, I
could add the dual DAC on this new adapter board.
I can see CS is connected to pin10 but where are
CLK and SDI of the LTC2632 connected? I don’t see
them in the code. Yes, It would be great if you
could post diagram for SCTV-E for Teensy 4.1 please.
Interesting that you are redesigning the
transformer. I managed to hand-wire mine and
seems to work well. The 6.3V for the heater is
the one that I’m not too sure how to calibrate
exactly, since the SMPS… It shines a bit too
bright at the moment and voltage drops to 2V, so
that’s not healthy for the heater filament. I can
remove a few turns but not sure what is the
‘exact’ RMS V I’m looking for given the spikes of
the SMPS at 100Khz, I’ll continue to experiment
on that using a 6.2V 500mA lightbulb to avoid
damaging the CRT.
Thanks again for updating the schematic when you
get a chance, it’ll save me so much time to
experiment.
On 10 Jun 2023, at 16:41, David Forbes
<nixie...@gmail.com> wrote:
Hi. The SCTV with the Teensy 4.0 uses an LTC2632
dual DAC. This uses SPI to load the X and Y
values. It's about half the update rate of the
built-in DACs in the previous Teensy 3.6, so I
had to change the step size in the drawing
routines.
Unfortunately this chip is tiny, so it's hard to
solder.
I am in the process of redesigning the
transformer and circuit board to be more
friendly for kit and DIY use. I want to make the
PC board with through hole parts, since people
enjoy soldering those together.
I will see if I can post the latest SCTV
schematic diagram to my website today. I've been
traveling a lot lately.
On Sat, Jun 10, 2023, 6:33 AM Max DN
<flata...@gmail.com> wrote:
True, but the schematic is SCTV rev. C which
is for Teensy 3.6. Does anyone have the
schematic for using Teensy 4.1? Just
designed a clock based on SCTV-rev and
custom transformer but of course I have now
realised that Teensy 3.6 is impossible to get...
Il giorno sabato 11 marzo 2023 alle 18:41:05
UTC SD ha scritto:
David Forbes has the schematic on his
website, and the firmware on Github. I
did not see that Jörg was making kits,
in fact he said he didn't want to make
kits, but perhaps make a PCB available,
so I do not know why people are asking
for kits.
On Friday, March 10, 2023 at 3:42:49 PM
UTC-5 liam bartosiewicz wrote:
The schematic and software would be
good enough for me, personally
On Mar 10, 2023, at 10:15 AM,
Darrin Weiss <hip...@gmail.com> wrote:
I also have some interest in a kit
On Friday, March 10, 2023 at
10:00:11 AM UTC-5 Richard Arndt wrote:
Yep... put me down too for a
Scope Clock kit of parts :-)
Making the H/W & S/W open
source would be cool too!
I think selling PCB's & parts
in kit form without enclosure,
places FCC requirements on the
user to not cause RF interference.
Isn't that how SparkFun and
Adafruit can sell assembled
PCBs without FCC certification?
On Thursday, March 9, 2023 at
9:19:56 AM UTC-5 Paul Andrews
wrote:
Do you plan on publishing
the software (on GitHub for
example)?
On Mar 8, 2023, at 5:36
PM, jörg
<pos...@gmail.com> wrote:
The tube is a RFT B7 S4-01
It‘s from an EO174A
Oscilloscope.
Nice green and pretty good
to focus and linearity to
the edges.
The tube and first version
of PCB could be viewed at
https://m.youtube.com/watch?v=zTyXJE2faXw
<https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fm.youtube.com%2Fwatch%3Fv%3DzTyXJE2faXw&data=05%7C01%7Cjoerg.postert%40otto.de%7C934c425d99ee4b01af7008db202467fd%7C8794e153c3bd44798bea61aeaf167d5a%7C0%7C0%7C638139112953496744%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=7yQJJjU6SCFcfQu%2BVxKoA8R9%2B%2FrsA1AVJOuO76nxNq8%3D&reserved=0>
I do not plan a kit or
selling like david forbes do.
First of all, it is
initially his design and
software. Second, I do not
have the will and time to
go through all the
regulations EU/Germany has
for selling such electronics.
I could share the PCB if I
order the next batch, but
it is not finished, yet.
I plan to add ESP32 for
NTP and web config.
On Sunday, March 5, 2023
at 8:02:28 PM UTC+1
Nicholas Stock wrote:
Definitely not
off-topic! I think
everyone on this forum
appreciates that post,
well done. I really
like the starfield
effect. What tube were
you using? Looks like
it has very good
linearity across the
whole screen....
Cheers,
Nick
On Sat, Mar 4, 2023 at
11:55 PM Wo Tu
<wtu...@gmail.com> wrote:
Hi !
Really interesting
and great work.
Looks really good
and its a „want to
have“.
Would be
interested in pcb
and code too , if
possible a kit too.
Thank you.
Michail Wilson
schrieb am
Samstag, 4. März
2023 um 15:11:01
UTC+1:
I am very
interested as
well.
Would love to
have the code
and pcb design
and even a kit.
I read through
the posts, but
didn’t see
anything other
than the
video. Thumbs
up on it too. 😊
Michail Wilson
206-920-6312
<tel:(206)%20920-6312>
*From:*
neoni...@googlegroups.com
<neoni...@googlegroups.com>
*On Behalf Of
*jörg
*Sent:*
Saturday,
March 4, 2023
7:14 AM
*To:*
neonixie-l
<neoni...@googlegroups.com>
*Subject:* Re:
[neonixie-l]
ScopeClock
with teensy4.0
@Jon,
yes, I will
share the
code. I have
moved it to
the VS Code
IDE with
PlatformIO. I
do not like
the Arduino
IDE much. It
should run on
david's
hardware, too.
Do yo you have
build the
hardware already?
On Friday,
March 3, 2023
at 5:12:46 AM
UTC+1 David
Forbes wrote:
I was able
to change
to a
Teensy 4.1
with a 2
channel 12
bit SPI
DAC in my
latest
version. I
had to
reduce the
DAC rate
by half.
It looks
just as
good as
the old
version.
Of course,
the DAC I
chise is
already
unobtanium.
On Thu,
Mar 2,
2023, 7:17
AM jörg
<pos...@gmail.com>
wrote:
Hi,
maybe
a bit
offtopic.
I've
put
some
effort
in
using
the
teensy4.x
to run
the
scope
clock
based
on
david
forbes
one.
The
teensy3.6
based
one is
running
on my
own
hardware
for a
while.
But
because
of CPU
shortage
and
the
use of
the
teensy3.6
internal
DAC's,
I was
curious
to get
the
stuff
up and
running
on the
faster
teensy
4.x CPU.
In
this
approach
I'm
using
a
parallel
driven
12 bit
4
channels
DAC.
The
usage
of a
serial
DAC
was
too
slow
and I
did
not
get
DMA up
and
running
on
teensy4.x.
Anyway,
this
works
and I
like it.
Video:
https://youtu.be/HYwgyYnQUxw
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