SBG- slow motion metal detector

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Hello. Question: Why didn't you use a CD 4053 and a LM 393?

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Here's how it works.https://youtu.be/1f9hKo_mBFU?is=x7KrqYobxh2n5CuG

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Slow motion discriminator.
Many have noticed that when a detector is very fast, the depth is reduced. The detector works restlessly and perceives interference. A good solution is a detector that works with slow signal tracking. In this option, there is almost no loss of depth. But then the discrimination of the find is problematic. This problem is avoided by fast tracking of the ground signal. Tracking is turned off when there is a signal for the presence of metal. Very correct discrimination is obtained. In the diagram you see a working detector. With a low sound it indicates iron objects. With a high sound it indicates objects made of non-ferrous metal. The indication of iron can be turned off. This is very useful when there are small fragments of rusty iron on the terrain. In this case, it is necessary to move the ground balance setting a little towards the ground. The diagram shows the data for OO coils. The detector works very well on soil and beach.