[sdiy] And another dumb question ( LM394 related )

[Scott Gravenhorst]

"Tim Daugard" <daugard at sprintmail.com> wrote:
>From: "harrybissell" <harrybissell at prodigy.net>
>
>> How it affects you depends on what you are doing. Its like the
>back diode
>> in a MOSFET... it can hurt you, help you, or not affect you....
>
>Definetely can hurt you. I was fooling around with an idea for a
>sample and hold. I had a mosfet on the breadboard as the switch.
>The circuit worked fine when the signal was rising. When the
>signal was falling, the sample sagged also. It took sitting with
>the data sheet that night, before the light went on, the
>protection diode made the part worthless in a sample and hold.
>
>
>If you get strange results, re-read the data sheet. 

I can't agree more.  I like it when the mfr puts the ESD diodes
into the schematic.  That way, you can see what's going on and the
problems then make sense.  RTFM...

>(See previous
>discussion of CMOS J/K (sometimes) flip flops. Sometimes ya got
>ta sits and thinks to see if whats going on can be explained by
>something in the manufactures data sheets. This is why I save
>the MANUFACTURERS data sheet for each part I have. 

Amen to that.  I keep them on a server at home, same thing, one
for each part I use.  I much prefer having the data sheet for the
actual manufacturer.


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-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
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