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Inverting the sense for warning tone controls

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nuckolls.bob(at)cox.net
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Posted: Sun Jun 22, 2008 5:05 am Post subject: Inverting the sense for warning tone controls

A number of builders who are incorporating DIY warning

tone generators in their projects are finding situations

where closing a contact to ground is the best way to

enable a particular tone. The drawings in Chapter 18

only accommodate a open-ground-for-tone function.



I've published a simple modification to the schematic

that will provide the close-ground-for-tone operation.

This same mod can be applied to any of the three

generators.



http://aeroelectric.com/Pictures/Schematics/Control_Sense_Inversion.pdf





        Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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