Saw Frequency doubler and Phase Shifter

[KA4HJH]

>I think in real life... you do NOT want the comparator to go rail to rail
>at all... you want it to slew between tightly clamped limits. If you have
>less far to go, you get there much faster. The clamps can establish 
>a reference
>that is more stable than the rails anyway.  Then playing with the  resistor
>values can get you back to the same spot.

I discovered this by accident with my light controller. I totally 
forgot about it swinging to -15V, I was thinking ground for some 
stupid reason. I also discovered that 2N2222's switch ON when you hit 
the base with -15V (avalanche?)--but not 2N3904's. Next time I'll 
clamp it with a diode the way I should have...


-- 
Terry Bowman, KA4HJH
"The Mac Doctor"