[sdiy] And another dumb question ( LM394 related )

[Tim Daugard]

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. (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. Generics and wrong
manufacturers won't always give you the whole picture.

Tim Daugard
AG4GZ 30.4078N 86.6227W Alt: 12 feet above MSL
http://home.sprintmail.com/~daugard/synth.htm