[sdiy] 4053 triple SPDT for VCO

[harrybissell]

Hi Aaron

4053 is ~not~ an ideal spdt

when it switches... there can be a point where both switches are on
(somewhat) at the same time. This could be a problem.

The 4053 will switch pretty much the full supply range... minus a small
amount.

I'd look at the Maxim or Siliconix switch line... +/- 15V range... and
some
true SPDT switching. ~or~ I'd control the 4016/4066 so that switching is
make before break.

I do have experience with the 4053... as the data sheet discloses... it
can
short the two ends of the switch. This screwed up my circuit... I used
diodes to
prevent the unwanted interaction.

H^) harry

Aaron Lanterman wrote:
> 
> Hi gang - one of my students is working on getting a triangle VCO going
> with a THAT and/or SSM2164 (I think he's working on the THAT now, I recall
> seeing a single line package on his breadboard.) Rene has been giving him
> a lot of wonderful advice.
> 
> I gave him a couple of 4066s to switch between reference voltages; Rene
> suggested using a real SPDT instead. Googling came up with the 4053.
> 
> I'm going to stop by Ack electronics (I say "Ack" everytime I go there) to
> see if I can pick him up a couple, since their projects are due Sunday and
> there's not a lot of time...
> 
> Will the 4053 do the trick, or is there another favored SPDT we should be
> looking into?
> 
> Also, I'm wondering about the supply... if we run the 4053 or 4066 or
> whatever off of referenced solid +/- 7.5 V sources, and then give it the
> _same_ sources as input, will it pass them happily? Or does the supply
> need to be a wee bit above what's being passed through?
> 
> - Aaron
> 
> -----------------------------------------------------------------------------
> 
> Dr. Aaron Lanterman, Asst. Prof.
> and Demetrius T. Paris Junior Prof.    Voice:  404-385-2548
> School of Electrical and Comp. Eng.    Fax:    404-894-8363
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