Metal detector allows up to a distance of 20 cm to detect any metal object. The detection range depends on square metal object. For those to whom this distance is not enough, for example, it is possible to recommend treasure seekers to increase the size of the frame. This should increase the depth of detection.
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The concept of the detector is shown in Figure 1. 3.50 as well.
The scheme is based on transistors, micro currents mode, and consists of the HF generator (100 kHz), at VT1, which is configured on the R1 resistor maximum sensitivity to metal objects.
simple metal detector in seven silicon transistors
Figure. 3.50. The simple metal detector on transistors: a-concept; b — construction of the detector.
As the coils L1 and L2 are two frames (fig. 3.50, b). VT2 transistors, ỲTZ includes both diodes and provide stabilization of oscillator modes-VT1 and active detector on VT4 at change of supply voltage and temperature.
The resistor R6 sets the sensitivity of the detector. The transistor VT5 and VT7 assembled a sound local oscillator, which included transistor VT6. In order to ensure that the loud sound HF1, parallel to him included the coil L3.
This increases the voltage due to resonance between the internal capacity and inductivity HF1 L3. When you hit the field coils L1-L2 frequency generator metallic object changes that reduces the amplitude of input voltage detector (VT4). It is locked, and the transistor, which allows opens VT6 work sound generator.
simple metal detector
This scheme compared with similar devices that use the principle of frequency of the beating, provides greater sensitivity and easier to manufacture.
As a power source applied battery type “corundum” or “Crown” (at 9), but can be used and any stationary source voltage 6-10 v. current consumption in standby mode is not more 1.5 Ma, when working audio signal — 7 Ma.
Printed circuit board
All schema elements can be placed on the printed circuit board from a one-way glass (fig. 3.51). Chassis frame manufactured from any dielectric materials such as glue, Plexiglas.
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Coils L1 and L2 must be identical and contain 40 +40 turns of wire with a diameter of 0.25 mm PAL (perimeter coils 340 mm).
Are customized to resistors R1 and R6 should be of type Sp5-16B, the rest can be any smaller. Capacitors C7-K50 type-35 to 16 in, the rest are type K10-17.
VD1 diode can be replaced with any pulse. Microswitch SA1 type PD-9-2.
When configuring the device, if you can’t get the generation at VT1 using adjustment resistor R1 (control voltage at the resistor oscilloscope), you will need to modify the connection phase conclusions coil L1.
When adjusting the scheme at maximum sensitivity to metal objects you might want to change the distance overlapping coils (fig. 3.50, b), then frame the coils need to fix with glue.
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