Hi Jean, Check out this web page, it has a better schematic than the datasheet... http://www.emulatorarchive.com/AM/AM3000/AM3044/am3044.html Regards Rob www.emulatorarchive.com > BUT it's got 8 ssm2044 chips inside. > > I've been searching the archive nd the net, but I can't seem to find any diy schematics.