[sdiy] Measuring filter response

[Magnus Danielson]

On 16/08/11 00:49, Dave Manley wrote:
> Years ago, a college lab I had did what you describe.  It works.
>
> In the good old days, we would hang a polaroid camera on the front of
> a tektronix green eye scope.  tek sold this as an accessory.
>
> http://www.recycledgoods.com/images/41053_1.jpg
>
> Pretty primitive, eh?
>
> A digital camera on a tripod in 'Bulb' or 'time exposure' mode could
> do the trick if you don't have a storage scope.

We had an exercise back in school where we where supposed to use 
oscillator and scope to figure out the basic properties of some lumped 
circuits. As I was fooling around with measuring PA systems at the time, 
I took with me the MLSSA system I used at work and took a few quick 
shots and finished of the lab in essentially no time. My teacher where 
more interested in seeing how it was done today than trying to correct 
me about not doing the lab properly... as they already knew I knew how 
it worked so it would be meaningless. Ah well. Still misses the good old 
MLSSA days. While it was a bit limited in its day, I've so far not come 
across a MLS system being quite so workable is it was.

I did try to build a MLS system out of a Motorola CMOS handbook, should 
try to get it to work. Would be a fun demonstration of the principle as 
it is a small logic thing and then requires a DMM and taking notes. :)

Cheers,
Magnus