On Monday, March 10, 2014 12:51:03 PM UTC, Grahame Marsh wrote:
>
> All valve GPS Rx added to my to-do list. But I think a crystal
> oscillator or mains frequency derived gate might be easier for the Mk
> 1. Perhaps a dekatron counter?
>
>
Always a good idea! :)
Jon.
--
You received this
> This is the reflector http://www.ebay.co.uk/itm/120982253359 (all sold now).
Actually the seller relisted it and has four more now. I had guessed you'd
picked up the reflector from a flashgun, those are much nicer, and have the
handy flat perimeter with mounting holes.
> The reflector makes
On 10/03/2014 12:35, John Rehwinkel wrote:
Thank you for taking the photos and posting them. I particularly like the
little reed for calibration.
I thought it was clever too, and it works pretty well - it's easy to turn the
dial until the strobe freezes the reed motion. That reflector you fo
> Thank you for taking the photos and posting them. I particularly like the
> little reed for calibration.
I thought it was clever too, and it works pretty well - it's easy to turn the
dial until the strobe freezes the reed motion. That reflector you found was
just the thing, it looks great.
John
Thank you for taking the photos and posting them. I particularly like
the little reed for calibration.
I was originally going to engrave the panel with high/low frequencies
but opted for a simple 0 - 10 as I was unsure how things would age; I
did realise the need for calibration adjust
On 10/03/2014 02:33, John Rehwinkel wrote:
I'm wondering if the missing center tap connection is internal to the
transformer, not brought out external to the transformer, and therefore not
shown on either the schematic, or wiring diagrams?? It would not surprise me,
although I would think that
On Saturday, 8 March 2014 21:52:38 UTC, Nixcited delighted wrote:
>
> Great work, as always.
>
> I love this diagram. Now why can't I do layouts like that? I'd never make
> a mistake ever again.
>
I know you aren't a Windows man, John, but I find that Visio is a great
tool for doing layouts -
"Should be" is a bit of an understatement. LOL. There MUST be a center
tap or it will NOT work. Ira.
On 3/9/2014 7:33 PM, John Rehwinkel wrote:
I'm wondering if the missing center tap connection is internal to the
transformer, not brought out external to the transformer, and therefore not
> I'm wondering if the missing center tap connection is internal to the
> transformer, not brought out external to the transformer, and therefore not
> shown on either the schematic, or wiring diagrams?? It would not surprise me,
> although I would think that they should have shown it anyway.
I
I'm wondering if the missing center tap connection is internal to the
transformer, not brought out external to the transformer, and therefore
not shown on either the schematic, or wiring diagrams?? It would not
surprise me, although I would think that they should have shown it
anyway.Ira.
This NSP1 has equivalents, (other numbers), which are as follows, SN4,
1D21, 631P1, CV220, R4100, and R4101. The 631P1 and the SN4 are
usually quite plentiful on Ebay. Ira.
On 3/9/2014 11:25 AM, Grahame Marsh wrote:
Part of my interest was building something all-valve/tube. As al
> NSP1 Ebay item 261169937643 - listed in the blurb as a "great audio tube"
> hmm..
Crisp glowing highs?
> A photo of (or link to) the older strobotach you have would be of interest; a
> google seach only turned up the modern digital versions that I could
> recognise.
I took a few picture
Part of my interest was building something all-valve/tube. As always
with this sort of circuit the inefficiency of the rectifier is appalling.
But a microcontrolled version is on the agenda as the tubes do turn up
on ebay. The twin triode multivibrator is a bit eratic and can be hard
to se
Nifty. I have two of the general radio Strobotachs that used the neon
tubes. I'm reversing direction on one. I'm putting solid state
internals in it with a microprocessor to read the big pot and set the
speed. That will get rid of the drift that plagues this model.
Best part is, I can fit the
> http://www.sgitheach.org.uk/strobotron.html
Nice job! I have one of the commercial units using that neon strobe tube. And
I understand your comment about how the original power supply works!
- John
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Enjoy
Grahame
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