[sdiy] No Power 4070 ring mod??

[Scott Gravenhorst]

Yeah, not recommended.  The 4069 and 4007 are really
better for this kind of experimenting anyway.  Also
4049 to some extent.  You get more and better access 
to individual transistor devices.  I haven't tried it
yet, but I think some sort of analog ringmod could
be made from an 'unpowered' 4007 or 4069.  I'm quite
fascinated with these devices lately, especially used
as linear devices instead of traditional logic.  They're
cheap and plentiful enough that you can't feel too bad
if you "waste" a couple in an experiment gone horribly
wrong.  And they're really not all that fragile if 
you're fairly careful in your design.  Eg, just think 
about what might happen if you were to make the protection
diodes conduct.  If you properly limit current with
resistors in the right places, it won't hurt it.


harry <harrybissell at prodigy.net> wrote:
>It is drawing its power through the input protection diodes direct
>from the signals themselves. A special case... you are only interested
>in the point where at least ONE signal is high.
>
>I don't recommend it... the input protection diodes will NOT protect
>the chip without a supply hookup... static damage is very likely !
>
>It will also be a little sensitive to the impedance of the inputs... not
>so
>that you would notice...
>
>H^) harry
>
>Ken MacBeth wrote:
>
>> I have also discovered that this 'single-gate' exor
>> ringmod requires no power to the chip, similar to the
>> MS20 ring mod! But why?.......
>>
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