[sdiy] o-scope z axis control

[oleavitt at ix.netcom.com]

As for precision full wave rectifiers,

There are some examples in the datasheets for the CA3130, CA3140 mosfet input opamps - if an opamp type of circuit is what you're after...

http://www.intersil.com/Data/FN/FN8/FN817/FN817.pdf
http://www.intersil.com/data/fn/fn9/fn957/fn957.pdf

tpaddock at seanet.com wrote:
> I'd like to play with z-axis (brightness) 
on an o-scope that I'm using for X-Y 
display of audio. Such as brightness 
dependant on the x and y signals so 
it's brighter farther out from center. 
And it doesn't burn the center 
with no signal. So, as a starting point...

Could someone point me to a "precision 
full-wave rectifiers for dummies"?

I got a TEK 608 X-Y monitor at a ham radio 
swap meet Saturday. Differential inputs for 
X,Y,Z, whooo-hooo!

Almost got an old counter that used columns 
of lights for the display. Can't remember 
what that's called. 

Later,
Toby
Paddock