Being fair, this clock was designed a long long time ago when stuff
directly connected to the mains was not so frowned upon - Mike is a
professional engineer and his page is covered with notes recommending that
isolation transformers are used - he readily admits that today, he would
never
I can tell you that if you want to advance one of these clocks in your
house hours at a time by remote control, all you need to do is work some
CW in the basement. :D
-Adam
On 3/17/2014 2:38 AM, Nick wrote:
Being fair, this clock was designed a long long time ago when stuff
directly
Actually, there's a Microchip app note, that describes the very same
technique. Personally, I don't like using it. I have a lot of respect for
Mike Harrison. He's a real sharp guy, and I'm really thankful for his
website ! As Nick mentioned, this is a really old design, and Mike just
probably
On Mon, 17 Mar 2014 07:44:03 -0700 (PDT), you wrote:
Actually, there's a Microchip app note, that describes the very same
technique. Personally, I don't like using it. I have a lot of respect for
Mike Harrison. He's a real sharp guy, and I'm really thankful for his
website ! As Nick mentioned,
On Monday, 17 March 2014 14:35:21 UTC, Adam Jacobs wrote:
I can tell you that if you want to advance one of these clocks in your
house hours at a time by remote control, all you need to do is work some CW
in the basement. :D
Now that the mains (in the UK at least) has no guaranteed
Yeah, toobs. I really screwed the pooch on that one, too. Didn't buy
enough, when the prices where low. :o(
~1990, I started using the HC05 microcontroller. The evaluation board,
which could be used as an emulator/debugger/programmer cost $500, and I
thought that was a bargain price ! I had
Let us not forget the Dallas/Maxim DS32KHZN/DIP TXCO.
That puts out a fairly accurate 32.768 kHz, guaranteed
within +/- 2 ppm.
For much greater accuracy, I've devised a programmable
pulse-remover which shaves off a predetermined amount
of pulses each hour. This, because every one of those
TCXOs
On Monday, 17 March 2014 15:46:33 UTC, Chuck wrote:
...
For much greater accuracy, I've devised a programmable
pulse-remover which shaves off a predetermined amount
of pulses each hour. This, because every one of those
TCXOs I've encountered tends to run a bit fast.
Essentially this
The way the pulse-remover works is at the end of
each hour it gets triggered, which shuts off the
32.768 kHz pulses from getting to the first
divider stage of the clock.
A binary counter then counts out the removed pulses
which are entered on an 8-bit dip switch.
At the end of the counting, a
What could make one of the Mike Harrison Nixie clocks run erratically?
It's basically running fast, but it also does this erratically- sometimes
it looks like the seconds are counting at the proper speed, but then they
will speed up...?
I build clocks using an 8051, synchronized to the power
On Monday, 17 March 2014 17:29:15 UTC, Mark Moulding wrote:
Microchip recommends just this type of circuit for direct off-the-line
embedded products.)
Just because Microchip discuss it (AN521
http://ww1.microchip.com/downloads/en/AppNotes/00521c.pdf
If you suspect line-noise, plug a noisy device into the socket next to the
suspect clock and turn it on/off rapidly for a few minutes to see if the
clock gains time. If your clock is susceptible to line-noise, it will gain
time. I found that my Weller WTCPN soldering station is REALLY noisy;
Has anyone tried the EMCO AG series of HV modules in a nixie clock yet?
Terry
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On 3/17/2014 12:56 PM, Terry S wrote:
Has anyone tried the EMCO AG series of HV modules in a nixie clock yet?
Terry
Terry,
Those modules do not put out enough power for a nixie clock. 7.5 mA at 200V is
enough to run three tubes at most.
They might work in a watch, but you'd need a 4.5V
On 3/17/2014 3:34 PM, Blitzen wrote:
Thanks guys, I guess...I was hoping there might be a solution or something
in particular to check.
What I don't get is that this is the third of these that I've made, and the
other two had no problems at all. In fact, I took this one and plugged it
in next to
Hi David,
Yeah, I'm aware that it wouldn't work in a direct drive clock, seems like
it might in a mux'd clock. Or maybe use a pair of them... Just wondered if
anyone has experience with them. I've requested samples. No pricing info
yet.
Terry
On Monday, March 17, 2014 3:06:09 PM UTC-5,
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