Make a simple metal detector

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Make a simple metal detector

Design
The concept of the device is shown in Figure 1. 1, it can be done in a couple of minutes. Metal detector consists of two almost identical LC-generators, inverters from DD DD 1.1-1.4; VD1, VD2 rectifier and high headphone BF1. When the search coil to the metal objects to the tone of the sound in the headphones will change.
Schematic diagram

Make a simple metal detector

The model generator, inverters DD DD 1.1 and 1.2, self-initiated at 465 kHz. Coil L1 is applied from a filter IF the radio. L2 coil wrapped on a 200 mm diameter, it contains 30 turns of enameled wire diameter 0.4 mm.
With the help of a metal detector is tuned to C2 KPE find objects of different mass.
In the manufacture of metal detector can I chip K155JIA3, Rectifier diodes – any high-frequency, variable capacitor of any compact receiver, such as a “Climber”.

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