A Classical DC Wheatstone- Bridge circuit is modified as shown in Fig. 1, where two very high gain Operational amplifiers A1 and A2 are connected with the bridge network with the non-inverting terminal connected to the circuit ground. This enables the bridge output nodal points B and D to be almost at the same potentials with respect to the ground and hence the effect of shunt resistance thatwill exist between them and also between them and ground, may be assumed to be minimized.