Electromagnetic induction detector. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Indicators, detectors, metal detectors
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This detector is easy to manufacture and operate. Even an inexperienced radio amateur can do it.
Transmitter circuit
Details:
VT1, VT2 - MP39 - MP42 (with any letter index)
R2, R3 - 100 kOhm
R1, R4 - 4 kOhm
C1 - 0pF
C2 - 0pF
C 3 - 0 pF
Power - Type C element (slightly larger than AA)
WA1 - 50 turns of PEV - 2 0, 12 - on a frame 10 * 10 * 10 * 10 cm (square)
Switch - any.
Frequency - 1 kHz
Signal amplitude - 0 V
Receiver circuit
Details:
WA2 - same as WA1
C1, C2, C3 - 47uF at 16V
R1 - 3 kOhm
R2 - 10 kOhm
R3 - 300 Ohm
BF1 - 60 - 100 ohm headphones
VT1 - KT315B
GB1 - three AA elements connected in series
SA1 - any
Coils can be placed like this:
In this embodiment, the detector can be used as a metal detector. If you need to roughly trace the wiring in the wall, you should place the transmitter antenna next to the found end of the wire, and drive the receiving antenna along the wall. In general, the number of options for using this device is limited only by your imagination.
Author: Petrukhin P., Petrukhin.Pavel [dog] mail.ru; Publication: cxem.net
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