74141 drivers are out of production. eBay and surplus shops are the best place to get them. Also the Russian K155ID1 (epoxy) or KM155ID1 (ceramic) is an alternative and can withstand even higer voltages. The ceramic IC's have a lower (better) thermal resistance. RadioShack is more expensive as distributors as Farnell and Mouser, however these shops are only useful for modern components. Best is to search the internet. eric _____
From: [email protected] [mailto:[email protected]] On Behalf Of Sean Sent: donderdag 16 augustus 2012 0:23 To: [email protected] Cc: [email protected] Subject: Re: [neonixie-l] Re: Design my own Nixie Clock? So, right now I'm looking at taking John's advice and starting with a solderless board and some LED's. I see most of these basic parts at RadioShack. Is this a good place to get parts? Any better places? Also, where is a good place to get the 74141 drivers? And the 5V power supply? Any common items I can repurpose? On the topic of drivers, is the 74141 pretty universal for all Nixie tubes? I read somewhere about the "blue spot" problem being caused by using the wrong driver. Sorry if these are pretty simple questions! On Wednesday, 15 August 2012 13:22:37 UTC-5, nixiebunny wrote: On 8/15/2012 11:18 AM, John Rehwinkel wrote: >> A couple of years ago just for fun I started from >> scratch and designed a nixie clock circuit from the >> ground up (pun intended), that uses (6) 74HC160 counters. > > How do you do the divide-by-6 digits? Just use gates to reset the counters > when they get to 6? I'm more used to using 7492 counters for that task, so > I'm curious. > > - John > Synchronous counters will accept a parallel data input and/or a reset signal. The tricky part is going from 12 to 01. You have to issue a load command with 0001 on the data bus to set it to 1. The '160 has an asynchronous reset, while the '162 has a synchronous reset. So the logic would be slightly different for those two parts. The advantage of synchronous counters is that you don't get glitches, and if you do, they don't matter since the signals are only sampled on the rising edge of the clock. It's not so important for a time-of-day clock, but designing circuits to work at a hundred MHz is a lot easier with synchronous logic. -- David Forbes, Tucson, AZ On Wednesday, 15 August 2012 13:22:37 UTC-5, nixiebunny wrote: On 8/15/2012 11:18 AM, John Rehwinkel wrote: >> A couple of years ago just for fun I started from >> scratch and designed a nixie clock circuit from the >> ground up (pun intended), that uses (6) 74HC160 counters. > > How do you do the divide-by-6 digits? Just use gates to reset the counters > when they get to 6? I'm more used to using 7492 counters for that task, so > I'm curious. > > - John > Synchronous counters will accept a parallel data input and/or a reset signal. The tricky part is going from 12 to 01. You have to issue a load command with 0001 on the data bus to set it to 1. The '160 has an asynchronous reset, while the '162 has a synchronous reset. So the logic would be slightly different for those two parts. The advantage of synchronous counters is that you don't get glitches, and if you do, they don't matter since the signals are only sampled on the rising edge of the clock. It's not so important for a time-of-day clock, but designing circuits to work at a hundred MHz is a lot easier with synchronous logic. -- David Forbes, Tucson, AZ -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/V5O-eepu_mAJ. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
