Re: TI-H: ti acceleration


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Re: TI-H: ti acceleration



Julian Svirsky wrote:
> 
> Hello
> I am e-mailing about TI acceleration. I have found some problems with
> the available plans.
> 1) I found two different places that say that (C9) or the original
> capacitor is 22pF and 33pF what is the true value ?
> 2) This diagram is either wrong or I am misunderstanding it. Can anyone
> explain please.
> (DIAGRAM 1)
>   ===========
>    |         |
>    0--       |
> \    |       |
>  \  1pF      0
>   \  |
>    0--          <--- Location, where the old C9 used to be
>    |
>    ====--C9--0
>        (22pF)
> First it's supposed to be a slide switch which are usually 2 position
> switches like this
> (DIAGRAM 2)
> _|_        _|_ <---- slider (only has two positions)
> _ _ _    _ _ _
> | | |    | | |
> | | |    | | | <---- 3 connectors
> 
> On slide switches the slider connects left and middle or right and
> middle connectors as in the (diagram 2) above. So how does the (diagram
> 1) work. I think the schematic should follow the (diagram 3) on the
> bottom. can someone please verify that.
> (DIAGRAM 3)
> _|_ <---- slider (only has two positions)
> _ _ _
> | | |
> | | | <---- 3 connectors
> | | |
> --|-|--------(original capacitor (?pF))--------------|
>   | |                                                |
>   --|------------------------------------------|     |
>     |                                          |     |
>     |-------------(new capacitor (1pF))--------|-----0
>                                                |     |
>                                                |     <>
>                                                |          <----- where
> the original
>                                                |-----<>
> capacitor was
I talked to the guy who wrote the txt file on ticalc a while ago and I
asked the same question. He said that you will still get 1pf capacitive
resistance out of his scematic. I decided to do it with a three-pronged
switch with the exact same layout you have above.  It works either way.


References: