FW: Texas Instruments IC's

[Harry Bissell]

The "discharge path" should be a short loop, you are dumping the cap across
itself...
OTOH that will make a major league magnetic pulse. Keeping other stuff away will
be good... and minimising the stray inductance will help speed things along...

I don't think the star ground will play for the discharge reason, but it is
Really GOOD
practice anyway...

Please update my thinking if I've got the discharge path wrong...

H^)   harry

Tim Ressel wrote:

> Tony et al,
>
> I concidered using a hexfet for that function. Ultra-low ON resistance, real
> fast. OFF leakage?? Not sure. And you have to watch the ripple current on the
> capacitor you are using. You can pull amps out of the cap if the switch
> resistance is too low. A series resistance should fix, but then you limit
> discharge time. Sigh...
>
> (Soapbox mode ON)
> Speaking of switch times, for allyou peoples wiring VCOs don't forget: that
> discharge path is going to have some BIG current spikes on it! Run that path
> directly to a star ground as far up the power chain as you can.
> (Soapbox mode OFF)
>
> Tim Ressel--Compliance Engineer
> Hewlett-Packard
> Verifone Division
> 916-630-2541
> tim_r1 at verifone.com
>
> -----Original Message-----
> From: Tony Clark [mailto:clark at andrews.edu]
> Sent: Tuesday, May 30, 2000 9:36 AM
> To: Synth-DIY
> Subject: Re: FW: Texas Instruments IC's
>
>    Of course there's always MOSFETs...maybe someone has a direct drop in
> replacement for a 466?  I'd love to know!
>
>    Tony
>
> ------------------------------------,----------------------------------
> I can't drive (my Moog) 55!         |     The E-Music DIY Archive
> ------------------------------------|
> Tony Clark -- clark at andrews.edu     | aupe.phys.andrews.edu/diy_archive
> http://aupe.phys.andrews.edu/~clark |     Contributions welcomed!
> ------------------------------------'----------------------------------