Hobby Hybrid MD1

[Ivont]

The transistor Q16 is controlled from ALL channel. When some target is detected, this transistor enables the work of the final stage of the DISCRIMINATION channel to show the type of the target - Fe/non-Fe. For Fe target, The "Fe" LED lights up first and after that "non-Fe" LED lights. For non-Fe target this order is reverse.

Why does discrimination use a later signal? Is the discrimination block swapped with the right channel?

[Ivont]

Sorry, I understand now. This sample is being removed.

[dbanner]

A bifilar coil where the Tx and Rx coil are co-located(hence bifilar). How can we null such a coil, or do we even have to? See, you can have a DD bifilar, so you have an inductively balanced arrangement in which each half contains a co-located Tx and Rx coil. When the Tx is on(on both sides), both Rx coils can be made to cancel each other(post signal processing) because they are balanced in the DD arrangement. Fancy pancy switching could make this work or not.
A beautiful symmetry is what the scientists always look out for. Surely this one can't be useless.

It is not a bad thing just to throw ideas out there, maybe one will stick.