Hi guys im trying to build a voltmeter. Figured using the 7129 chip would be easiest, since it has everything included internally. Ive seen some diagrams how to implement this but still a little confusing. Mostly the amplification stage. I came up with a little schematic on how i think it works, let me know if right or wrong here, but does it use a 3p4p switch to control between the voltage drop on the resistor chain and the correct output voltage? Because it seems it should be easier than that.