Am 06.09.2009 um 02:22 schrieb fmg: > And not to be too OT, an old project: a EQ/Mix I made with a VFD > biased > for linear operation. (One of the last schematics made with Xfig) > > http://www.geocities.com/eqys/var_tmp/vfd_eq_mix_01b.pdf That's amazing! What does the VFD do here, is it a buffer? Ingo