Re: [neonixie-l] Re: My NixiChron is sick, what do I do?

[Instrument Resources of America]

    In my 50 years or so of worinkg on electronic equipment, I have 
quite often seen Vcc and Gnd, and others very often omitted from 
schematic diagrams, to help eliminate clutter. Quite often a separate 
page or diagram will then be used to show various, power and ground 
distributions. This is almost always the case on high density circuit 
boards.    Ira.

On 5/12/2016 11:22 AM, Niek wrote:
You can have a look at the schematic of the NixiSat (which was posted here earlier - not 
the NixiChron, but I assume it's similar: 
https://docs.google.com/viewer?a=v&pid=forums&srcid=MDEwMDEwODgzMDkzNzgxMTU3NTQBMDI2MDI2MDkxODMwNDU5NDc0NjYBN3poTlVQTHJxcG9KATAuMQEBdjI&authuser=0)

Interestingly, at least in that schematic, it looks like the VCC and GND (pin 
16 and 15) of the MAX232A are not connected. It could just be a shortcoming of 
the schematic of course (in fact, I would be a bit surprised it worked at all 
without them - though it's not completely impossible if e.g. it's powered 
through any internal voltage protection diodes), but you may want to double 
check this on the actual PCB. The other IC's in the circuit do show their 
VCC/GND connected, so it's a bit surprising to see it missing from just the 
MAX232A.


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