MM5311 or MM5309

[wb9jfr42]

Has anyone built a clock using MM5309 or 11 chip with nixie tubes

Using BCD to a 74141 but don't seem to be able to multiplex

i would like to use the chips that i have had for many years

Thanks

jerry

[gregebert]

I would recommend a newer clock chip, such as the DS3231, and focus the clock design towards the most important devices (nixie tubes). The DS3231 is quite accurate, has all the battery-backup functions, and you can purchase small, inexpensive, and ready-to-use PCBs online. It's an I2C interface, so obviously it wont direct-drive nixies or even nixie-drivers.

My latest clock designs use a separate driver board, so I can switch to a different tube just by redoing another driver PCB.

[jf...@my-deja.com]

I would steal ideas from two places.

 

For your cathode drivers, I would use the circuit from Figure 6 of the MM5309 data sheet ( http://connect.enterprise.online.fr/mm5313D/mm5309-5311-5312-5313-5314-5315.pdf ) on page 1-7 to interface the ~BCD outputs to TTL.  You might have to invert these with a 7404 to get the correct data polarity for your 74141.

 

To drive your anodes, follow the ideas from the article on page 70 in the July 1976 issue of 73, “Behold the Giant Nixie Clock - using a minimum of new parts” by Jack Grimes, W4LLR (http://www.tube-tester.com/sites/nixie/dat_arch/B-7971.pdf ).  He uses high voltage pnp transistors (like the 2N5401, although I used surplus TO-220 transistors with a nominal BV of about 300V) with the emitters connected to B+ (about 180V), and the bases capacitively coupled to the digit-select outputs.  Since this was designed for the MM5314, it should work just fine for your MM5309/MM5311.

 

I modified these ideas to work with a CT7001, and built three clocks.  All are still working 24/7 after more than 35 years, with the only failure due to an underrated surplus power transformer.

 

[wb9jfr]

Thanks

But I would like to use the old chips  like me

 

Thanks

Jerry

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[Ian Sparkes]

I would echo gregebert's comment: Use a newer chip, I get them for about a dollar a piece. However, that's not what you want to do, so:

The slight problem I see with the chips you have is that they have negated BCD outputs. You'll have to get some TTL NOT gates (e.g. 7404). Unless you want to go "full-retro" I'd use some opto-isolators for driving the anodes. Have a look at the schematic on page 11 in the Arduino based clock I have - it doesn't get much simpler than this.

http://www.open-rate.com/Downloads/NixieClockV8InstructionManual.pdf

Ian

[wb9jfr]

Thanks to all for the help

 

jerry

 

 

From: neoni...@googlegroups.com [mailto:neoni...@googlegroups.com] On Behalf Of Ian Sparkes
Sent: Saturday, June 20, 2015 6:39 AM
To: neoni...@googlegroups.com
Subject: [neonixie-l] Re: MM5311 or MM5309

 

I would echo gregebert's comment: Use a newer chip, I get them for about a dollar a piece. However, that's not what you want to do, so:

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[threeneurons]

I just looked at the datasheets, those chips multiplex the display. That means only one 74141 needed per project. The digit select, is active low. You can use the traditional MPSA42/MPSA92 anode driver, with a simple fix. No not an inverter. Tie the bases of all the Anode MPSA42s to +5V, thru a base resistor, an connect the emitters to the corresponding IC output. This is the common base arrangement, which many seem to ignore.

On Friday, June 19, 2015 at 1:55:55 PM UTC-7, wb9jfr42 wrote:

[threeneurons]

Yeah, you need an inverter for the BCD though.

On Friday, June 19, 2015 at 1:55:55 PM UTC-7, wb9jfr42 wrote: