-Original Message-
From: westdave
To: neonixie-l
Sent: Tue, May 15, 2012 12:40 pm
Subject: mikes new board
mike's new board ,a no microprocessor approach,to nixie/dekatron clock,
there is a new kid on the nixie block ,the three neurons nixie clock is what
ever you need it to be , a quick project or you can spend weeks on it ,adding
things on,
designed to be driven by a 9 vac (1 amp) transformerd wall wart and timed at
60hz,is the easiest configuration , and uses the dekatron pendulum as part of
the timing circuit, however
a 12 volt dc switching power supply may be used ,if you go this way there is no
60hz to run the dekatron part of the clock so a 60hz faker has to be made (from
a lm555) and added on. also a 1 Hz clock single must be found ,recommended are
ds1306, xtal osc at 1hz,
also you can add a GPS mod (EM406a) 5 volts dc input GPS 1 pps output ,in ttl
. for about $40 and have a second that will not drift,i have a few of these set
for the same second and they do not drift apart
The cosmos chips are real cheap and the 5 nixie drivers can also be purchased
very reasonably (this is where most of the power goes)
learning to use my shop vise to squash the 20 pin header on to the 20 wire
rainbow wire and trim with a scissors, was easy,
admittedly working with the raw wires on the other the end of the header takes
some time
stripping and tinning but it lets you use any type of tube (and socket) you
want and space them any way you want
i like to add two plus minus tubes (flashing a +- every .5hz) instead of colons
making a set of 8 nixie tubes also an add on (two 220k resistors and a mpsa42
xsistor and two anode resistors aprox 10k depending on the nixie tubes used)
the switches have no clocking inputs(they just read an add on pulse so you
might have to push it 59 times to set the mins 12 times for the hours
, and a hold switch will have to be added to sync the seconds exactly.
another add on is the leading zero (two 220k resistors and a mpsa42 xsistor)
and
just to add an extra layer of fun the first run of boards need some reworked,
to work,this has been carefully worked out by mike and might hake an extra 30
mins to go over, four wires and two diodes (in4814)are the FIX,
the board has many discreet parts mostly to run the dekatron pendulum
many types of dekatron tubes are supported
needs a Taylor 1363 hv power supply to work,just plugs in (sweet)
other stuff, the diodes are all common 1n400x(7) 1n4814 little glass jobs
19 of the resistors are one value 22k,6 transistors are mpsa 42 one mpsa92 and
one mpsa05,make sure the 1uf is 100 volts or more&that 4 are 250 volts
Davester sez ,this one has it all
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