[sdiy] multiplier from three 741s?

[Ove Ridé]

On 15 November 2014 11:34, Paul Perry <pfperry at melbpc.org.au> wrote:
> I think this link shows how to overdrive the 741 output stages to get the
> square function and so on.
> http://2005.iccas.org/submission/paper/upload/2multiplier.pdf

No, what it actually seems to be doing is abusing the supply pins of
two of the chips. They are not connected directly to V+ and V-.
Instead, V+ and V- are treated as terminals connected to a current
source, and because of how the transistors are laid out inside, it all
works out. Very clever indeed! I need to build one now. This design
can likely be expanded to be used as a VCF as well.

-- 
/Ove

Blog: <http://blog.gg8.se/>

"Here is Evergreen City. Evergreen is the color of green forever."