[sdiy] ca3080-based tri-to-sine

[Harry Bissell Jr]

If you have the right input voltage you could
calculate the current from the input load
(resistance).

OTOH If you are getting the right voltage you are
probably OK.

These converters work by overdriving the OTA. If you
go too small in input voltage, you still get a
triangle. Too large and it slowly turns into a square
wave.

Another issue... if the wave is asymmetrical, you have
some offset voltage in your input signal. 

I'm not looking at the schematic right now. Tell me
where you got it from and I can look.

I find that two trims, input level, and input offset
are needed to get a decent sine. Even then its not
perfect, but its more sine than triangle at least...

H^) harry

--- Karl Ekdahl <elektrodwarf at yahoo.se> wrote:

> Hi list, i am trying to make a ca3080 tri-to-sine
> from
> a paper by Bernie Hutchins work... I have the right
> input voltage, though i'm a little bit confused as
> to
> if there's any current-requirements...  anyhow, if
> there's anything common to look for in this (really)
> simple schematic please give me a pointer...
> 
> thanks
> 
> Karl
>