Alas another one gone.
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On Fri, Nov 18, 2022 at 7:34 PM, Tomasz Rola via
cctalk wrote: As the subject (and wikipedia) say:
https://en.wikipedia.org/wiki/Fred_Brooks
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Regards,
Tomasz Rola
--
** A C programmer asked whether computer had Buddha
The H7842 PSU in my Rainbow failed yesterday. At first the machine just
powered down and there was a slight burning smell, I wasn't next to the
machine when this happened, so I didn't see or hear anything to tell me
where the problem might be. Not being sure if there was a short in the
machine or a
Hi Rob,
I'm only guessing here. I think the sequence may have been that the
main switching transistor failed first as it would be under more stress
than a diode in the base circuit. If the transistor shorted E-B-C then
the HT would become connected to the circuitry at it's base which would
be co
Hello Peter,
Thanks for the analysis. There doesn't seem to be anything further back from
the diode, unless you mean further back behind the inductor?
I will check on the output side as you suggest.
The circuit breaker did pop out when it failed. The onboard fuse is intact.
The house RCD trigger
On 20/11/2022 17:40, Rob Jarratt via cctalk wrote:
The H7842 PSU in my Rainbow failed yesterday. At first the machine just
powered down and there was a slight burning smell, I wasn't next to the
machine when this happened, so I didn't see or hear anything to tell me
where the problem might be. No
Thanks Antonio,
The location of the diode is arrowed on this picture:
https://rjarratt.files.wordpress.com/2022/11/img_20221120_205802-arrowed.jpg
You can also see the heatsink where the transistor used to be.
Regards
Rob
> -Original Message-
> From: Antonio Carlini via cctalk
> Sent
Hi Brad,
I just came across your post from last year about my father, Richard C.
Bemis. He passed away in June. I wish I knew more about the digital group
and would love to see the video or article you are working on. I can also
fill you in on what my dad did after dg.
Thanks,
Whitney
___
Whitney
Hi Rob,
>
> Thanks for the analysis. There doesn't seem to be anything further back from
> the diode, unless you mean further back behind the inductor?
>
I probably do. I guess the base drive for the main switching transistor
comes from another smaller transistor via the inductor and the diode w
