[sdiy] multiplier from three 741s?

[Michael E Caloroso]

Clever indeed, looks like it took some inspiration from class G/H
power amps.  Stability would be dependent on the input errors of the
selected opamps.  Tempco would be a challenge.

MC

On 11/15/14, Ove Ridé <nitro2k01 at gmail.com> wrote:
> 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."
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