Sparkfun isn't bad. Also Limor Fried (ladyada)'s site:
http://www.adafruit.com
Limor is a member of this group and a great person to deal with.
Radio Shack... They're trying to make a comeback into this area of
retail, time will tell if they succeed. My experience has been that they
cost about 5-10x as much as anywhere else.. especially on small stuff
like transistors/resistors - which I normally buy from mouser or
digikey. The nice thing about radioshack is that they are immediate, no
shipping time.
The 74141 (the real kind) can be purchased from mouser. The Soviet clone
is available on ebay and probably various member sites (sorry, I don't
know who to plug here.. I only ever bought them from ebay). The "blue
dot" problem is specific to IN-18 nixies, which you are unlikely to be
messing with right out of the gate. 5v breadboard supply can be
purchased from any of the "getting started in electronics" retailers as
well as from many chinese/hongkong sellers on ebay.
-Adam
On 8/15/2012 3:23 PM, Sean wrote:
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
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