Erica Synths EDU DIY EG Eurorack Module Kit - Manual (Page 13)

And with this, we’ve now forced the envelope’s operating voltage range to always be
between 0 and 12 V. Great! To see if that actually works, let’s try it on the breadboard.
Make sure that the TL072-chips (which house two standard op amps each) are set
up exactly as shown here –
if you reverse the power connections, they will heat up
and die!
If you now go ahead and test this, everything should be working pretty much like before –
though the range of filter movement will be significantly increased.
13