A starting point is to look at the Average current.
Look at the On versus OFF times, duty cycle or whatever you want to call it.
Average the current over the whole time period.
eg if it is equal ON to OFF, the average would be 50%
Try working it out that way as a starting point. eg the power dissipated
in the resistor is found from that average too.
The guys who regularly multiplex will give you data or rule-of-thumb for it.
John k
- Original Message -
From: rubli
To: neonixie-l
Sent: Friday, December 11, 2015 2:39 PM
Subject: [neonixie-l] Nixie safe current question
Hello
I finally got to make my own design of a clock using a PIC16F886, and have a
question...
I am using a Optocoupler (PIC817) to drive the anodes, cathodes are driven by
a 74141.
collector of the opto is tied directly to my HV of 170 Volts, on the emitter
of the opto, I have a resistor of 10K that goes to the Anode.
I am making tests with a LD-866 Nixie (I found a wired board with six of
them), but I pretend to use the IN-14
I attached the oscilloscope on the anode resistor, and here is what I got:
p/p voltage = 34 Volts so the p/p current is 3.4 mA.
my frequency on the anode is 98 hz (I don't know if the multiplexed frequency
is expreesed this way, sorry)
my question is...
how do I know if the current I am exerting on the tube is within safe limits ?
the data sheet of the LD-886 says 1.5 mA, and the IN-14 says 2.5 mA
but as I am multiplexing, I am lost to know...
thanks in advance
best regards
Alexander Rubli, Mexico City
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