20 years ? Amazing. How is the phosphor holding up after 20 years ? Do you
dim the CRT (ie, with a PIR sensor or manually turning-down the brightness)
, or just let that run as well ?
I have an 8SJ31J CRT clock kit I bought from an overseas seller (it
wouldn't surprise me if they plagiarized
The Ccope Clock has a rather unusual power supply. It makes a 100kHz square
wave for the tube heater. You can't measure it as 6.3V RMS because it's not
a sine wave.
When I designed and tested the transformer, I went by the color of the
orange heater glow to get the voltage correct. It seems to
Where is the power to the regulator for the +5v isolated supply coming from
? That source needs to be isolated as well.
On Saturday, June 17, 2023 at 9:01:46 AM UTC-7 Max DN wrote:
> That was a mistake, I have corrected the schematic, attached. Grahame
> pointed it out too. Apologies.
>
> What
For the longer tubes where the brightness gradient is problematic, the
usual DC-DC converter to get the voltage followed by an H-bridge to
generate an alternating polarity square wave is another option.
David
On Sat, 17 Jun 2023 at 04:29, Richard Scales
wrote:
> Many thanks for all your
I see a +5 v supply going to the filament supply, but there is no mention
of that being isolated like the 12V_isolated supply. I suspect there is
missing isolation somewhere. The filament is biased near the cathode
voltage, which is several hundred volts negative.
On Saturday, June 17, 2023 at
Did anyone here buy the two prototype tubes Dalibor had for sale?
Rob
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