obscura
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USB EQDir for under £4
in DIY Astronomer
Posted
In the olden days after the demise of valves and trannies - a minutes silence - I seem to recollect that TTL was initially 5V. It became 3.3V for speed/quicker pulse rise times but within a pcb or within a system. I cannot recall 3.3V being used for transmission along external cables and this was left to RS232C +/-12.5V or meaty 5v drivers.
But then, that was a long time ago and perhaps too long for an original nerd.
Hi Dave. Just to say, your web site is but a key away and was instrumental in the mod of my 350D. Look forward to future posts.