Hybrid MD with TX-ON Time Only Processing

[Detectorist#1]

Hi MD enthusiasts,
I'm ready with in-home tests of hybrid PI-IB MD with TX-ON only signal's processing. The sensitivity is no lower than very fast PI MD with IB coil with only TX-OFF processing with main delay-4us and strobes: main-3us, EFE-3us after 100us. The discrimination Fe/non-Fe for targets is appr. the same for my limited set of targets. The tests in field will point which variant (with TX-ON or TX-OFF variant) is more immunized from soil's influence for these so simple designs without GB.
Attached is the scheme of this current design.

[Detectorist#1]

Also, I think, the variant with two LiPo accus as power source is very convenient in practice. Especially with possibility to charge these acccus from wide used USB sources. This idea is inspired to me from Ivconic - thanks for him!

[Detectorist#1]

Next extension of this idea is to add ground balance possibilities in this hybrid PI-IB detector. I hope, our common efforts will have good results in near future.

[Detectorist#1]

The received signal from the targets in beginning of TX-ON time is appr. 10 times stronger then RX signal in TX-OFF time. This allows to use TX signal with very short duration - 8us to 10us and very high TX frequency - 20KHz to 30KHz. If the TX frequency is 3KHz to 4KHz, the current consumption is only 25mA and this allows to use 9V Block battery instead of 8pcs. AA batteries or 2pcs. 18650 Li-Po batteries with DC-DC 12V converter. Only possible problem is how the reactive reaction of the real soils will affect the sensitivity in this PI-IB design. The things seems to good to be real at this stage.