metal detector antenna In the category Metal Detectors Videos more articles and learn more information about metal detector antenna Reviews Price Specifications Features Image manuals videos Accessories All this in metal detectors for gold.
This original detector responds to the approach of metal objects to the magnetic antenna WA1. The antenna itself is part of the high-frequency generator that was run on the transistor VT1. Frequency generator, you can change the variable capacitor (capacitor used PDA-2 with change of capacity from 25 to 150 PF).
High frequency generator output signal goes through the capacitor C4 on the rectifier or detector collected on VDI VD2 diodes.
Tension released on C5R6 chain, opens the transistors VT2, HL1 led is lit. This State can be achieved by moving the engine AC resistor R3 from the lower output schema.
Approaching magnetic antenna, such as scissors, will cause such a change in the frequency of the generator, the voltage at the base of the transistor ỲT2 will start to decrease. The led will be extinguished.
Changing the frequency of the generator capacitor C1 and picking up the position engine AC resistor R3, there must be the greatest sensitivity detector — will react to the metallic object from a distance of a few centimeters to magnetic antenna.
You may be able to configure the detector so that he can react even to the approaching hand. In this scenario, the frequency of the generator will vary due to changes in oscillatory circuit capacity of the generator.
Magnetic antenna can be performed on the Web with a diameter of 8 mm and length 80 mm 600 ferrite. Winding should be wrapped in one layer of wire PEV-2 0.25. It should contain 83 revolution tee from 9-th coil, counting from 1 output. How to search to find coins, jewelry, treasures.
According to their purpose and a set of tools tasks divided metal detectors: Metal detectors for beginners Cheap computers, research .
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