Re: [neonixie-l] Question on SN74142s

2012-02-23 Thread Adam Jacobs
They're also covered in the TTL Cookbook (That's where I found out about them)... Where did you find them?!? -Adam On Thu, Feb 23, 2012 at 6:44 PM, David Forbes wrote: > On 2/23/12 7:11 PM, Dylan Distasio wrote: > >> Hi all- >> >> I recently picked up 2 SN74142 ICs. I'm about to show my ignora

Re: [neonixie-l] Question on SN74142s

2012-02-23 Thread David Forbes
On 2/23/12 7:11 PM, Dylan Distasio wrote: Hi all- I recently picked up 2 SN74142 ICs. I'm about to show my ignorance again, but can someone with some patience walk me through how I would use these in a nixie clock. I'm familiar with the 74141s but have to admit after reading the SN74142 datash

[neonixie-l] Question on SN74142s

2012-02-23 Thread Dylan Distasio
Hi all- I recently picked up 2 SN74142 ICs. I'm about to show my ignorance again, but can someone with some patience walk me through how I would use these in a nixie clock. I'm familiar with the 74141s but have to admit after reading the SN74142 datasheet I am not entirely sure how this one work

Re: [neonixie-l] Testing B7971's

2012-02-23 Thread jb-electronics
Oh - if only perfect ones were still that price !!! You might be needing a time machine for that ;-) Jens -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from

Re: [neonixie-l] Testing B7971's

2012-02-23 Thread Mefistofelix
The tube in question (B7971 with just the one dodgy segment) now on eBay at £0.99p (about $1.50) http://www.ebay.co.uk/itm/260963179117?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649 Oh - if only perfect ones were still that price !!! -- You received this message because you are subs

Re: [neonixie-l] Re: Dallas/Maxim TCXO question

2012-02-23 Thread Frank Bemelman
I had a quick look at the datasheet, and it seems there is no tuning register, only an aging register. That resister you can use if you really want to recalibrate it, using the DS3231 32Khz output and your 32Khz reference derived from a caesium clock or something. I wonder how Maxim calibrates th

Re: [neonixie-l] Re: Dallas/Maxim TCXO question

2012-02-23 Thread Mike Harrison
On Thu, 23 Feb 2012 13:14:52 -0800 (PST), you wrote: >So, what is the best way to calibrate these chips? How do you figure >out the values for tuning register and aging register? I normally set >the tuning register by comparison with a second time source over 1 >week, usually that is good enough f

[neonixie-l] Re: Dallas/Maxim TCXO question

2012-02-23 Thread Cobra007
So, what is the best way to calibrate these chips? How do you figure out the values for tuning register and aging register? I normally set the tuning register by comparison with a second time source over 1 week, usually that is good enough for about 10 seconds per year. But how do you figure out th

[neonixie-l] Re: Dallas/Maxim TCXO question

2012-02-23 Thread Jeff Thomas
On Feb 23, 11:16 am, "MrNixie (UK)" wrote: > Yes, a neat little chip, which rather renders other time references > such as GPS or radio time codes unnecessary for all practical > purposes. But then, I don't think of a nixie clock as just a practical > time piece! > > Laurence Thank You very much

[neonixie-l] Re: Dallas/Maxim TCXO question

2012-02-23 Thread MrNixie (UK)
Michel, no 100Hz output I am afraid, since the on board (embedded) crystal is 32.768KHz and of course 100Hz is not a sub multiple of this. 8.192KHz, 4.096KHz, 1.024KHz or 1Hz (which is what I use to interrupt the processor, and collect the latest time). The resolution of the on-chip ageing regist