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Transistor latch and one green LED can add VCO functionality to almost any metal detector, just need to be added to final DC amplifier / integrator stage.
In result this modification add VCO mode and expand working voltage range of integrator while the original integrator or dc amplifier goes in to saturation and remains useless
VCO turns on only at strong signals, with weak signals detector will operate as original, without modification.
Not pretend to be original, but this is what I came up with
Here is simulation with different input voltages
Note that at an input voltage of 55 mV, the original circuit should already enter in useless saturation mode but instead it switches and operates as VCO
In result this modification add VCO mode and expand working voltage range of integrator while the original integrator or dc amplifier goes in to saturation and remains useless
VCO turns on only at strong signals, with weak signals detector will operate as original, without modification.
Not pretend to be original, but this is what I came up with
Here is simulation with different input voltages
Note that at an input voltage of 55 mV, the original circuit should already enter in useless saturation mode but instead it switches and operates as VCO
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