Re: TI-H: My TI92 Hardware Homepage : RTLink?


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Re: TI-H: My TI92 Hardware Homepage : RTLink?




I don't know if this thing really works.
I can't build that because I don't understand his switching symbols. 
 - No chance for testing :)
I found this on www.ticalc.org and I think that something which is on ticalc.org should work.
> You mention on the radio link page that you don't understand some of the
> symbols used in the schematic, like which ones?  He is using those little
> trapezoids for transistors and in one place he has a cap drawn with the
> gap filled with slanted lines.  Not sure what that means.
I don't understand his coils.
> I have three questions about this circuit.  I'm no EE, my electronics skill
> doesn't extend much above the basics, so I may be totally off, but a couple
> of things looked a bit strange to me.
> 
> First, and this is a big one, there is no indication that the separate power
> supply for this thing has a common ground with the calculator.  He
> explicitly
> mentions that the link's ground cable is not to be connected.  That means
> that 5v on the red wire (relative to to the calc ground) isn't necessarily
> 5v relative to the RTLink's ground.

> Second, the white wire is connected directly to battery negative ?? Doesn't
> that make it kind of hard to send half of the bits and ack the other half?
> I don't see how the RTLink can ack any bits received from the calc.
> 
> Third, well, I forget what the third was, but last I knew there was no
> working
> radio link (other than perhaps Grants, but I haven't heard of anyone else
> who has successfully built that).  Is this one of the hoax plans, or does
> this thing really work?



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