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Most of the circuits are similar and speaking of the new circuit as new innovation is nonsense, all the circuits and projects posted here are similar to each other with similar performance.
Every thing for a new detector is in the 1st stage of the OpAmp
What u need to do is change the front ends like 2 coil Tx Rx, also important thing is u need to see to the first opamp amplification connected to Rx coil , use a low noise one, to detect weak signals, also see that u dont feed the power rails to the input of opamps too as in Stuart1 & 2 at LM318 by using a DC blocking capacitor !!, u need to check the change in coil voltage at Tx off, Also the Johnson noise produce by 1Meg resistor at feedback of Lm318
try to maintain the noises very low
regards
Every thing for a new detector is in the 1st stage of the OpAmp
What u need to do is change the front ends like 2 coil Tx Rx, also important thing is u need to see to the first opamp amplification connected to Rx coil , use a low noise one, to detect weak signals, also see that u dont feed the power rails to the input of opamps too as in Stuart1 & 2 at LM318 by using a DC blocking capacitor !!, u need to check the change in coil voltage at Tx off, Also the Johnson noise produce by 1Meg resistor at feedback of Lm318
try to maintain the noises very low
regards