Paul,
This is quite a nice project. It looks like a very clean display.
I have run out of the custom transformers I had made in 2006, and I'm
quite interested in using off-the-shelf ones in the future. Would you be
willing to share a schematic of what you made?
I also appreciate using SVG rather than rolling your own graphics.
That's a nice standard solution that makes sense in this age.
On 2/26/2024 2:12 AM, paulvr wrote:
This is my first post in this forum and I would like to introduce you
to my version of the scope clock. Mainly inspired by the work of David
Forbes and Grahame Marsh.
The work is not finished yet, but I have reached a milestone for
myself in that all components are on one PCB and only one voltage
source is required, nm. 12 volts DC.
The high voltage is made using a standard Würth WE-flex transformer,
plus and minus 250 Volt. The filament voltage is provided by a buck
and forward converter and a standard Würth push-pull transformer (6.3
Volt to 600mA).
The MCU is an STM32G491, mainly chosen because of the integrated
12-bit DACs. The image composition is completely DMA controlled and
works independently of the CPU, which therefore has a lot of time for
other tasks.
The characters and graphic shapes are encoded as SVG path.
An ESP32 has been added to achieve the correct time according to the
NTP. Operation is entirely via a web server running on the ESP32. The
software is not finished, and not all functions work (work in progress).
The next step is to try out other CRT tubes and make a housing.
Regards,
Paul
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