Run of the mill AD and DA You should be able to get them in every electronic component store. From: Keith Winstanley <keithw at cix.compulink.co.uk> > In-Reply-To: <ilGfrOBHaRl7Ewqb at btinternet.com> > ZN427E-8 > ZN426E-8 > > Keith > > http://home.freeuk.net/lowpass > >