On Tue, 23 Jun 2009, Louis van Dompselaar wrote: > it is quite interesting, but even apart from the CEM chips it uses > there's the even harder to get ZN429 D/A converter. Since it's just an 8-bit R2R-based DAC, shouldn't a manually wired R2R network e.g. using measurement resistors (0,1% tolerance) be a suitable substitute? Rainer