(around £2.50 eBay)Īs an alternative you could well use the AD623 which combines all these parts in a single 8 pin dip package, and has the advantage of being able to operate from a single supply (but only if V1, V2 fall within the supply range). The MCP series are particularly suitable in this application, giving one, two or four op amps in an 8 pin or 14pin DIL package at low cost. A negative supply is easily provided as described below. In general amplifiers of this type require positive and negative supply rails connected to each amplifier (indicated but not fully shown in the diagram). However the gain can be adjusted by trimming R1a & b, and any voltage offset by adjusting R5, VR1. First stage amplification is provided by IC1a (IC1b) while the second stage around IC2a amplifies the difference between V3 and V4.Īccuracy depends on the precision of the resistors used, so pairs of resistors Ra, Rb should be matched. The circuit provides amplification through two stages. The circuit provides two measuring inputs V1, V2 that will be used to make a measurement of the voltage difference between them.
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