Gas pipe detector. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Indicators, detectors
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The position of the gas or water pipes hidden behind the wall can easily be detected by the proposed detector. Resistor RV1, when adjusted, achieves a generation mode slightly above the self-excitation threshold (while the LD1 LED barely glows).
(click to enlarge)
When the L1L2 coils approach the metal pipe, the generation breaks down, the transistor TR2 closes slightly, and TR3 opens completely, causing an increase in the brightness of the LED. Resistor RV2 can be used to adjust the sensitivity of the device (detection range).
Coils L1 and L2 are wound on a ferrite rod (with a magnetic permeability of 400 ... 600) with a diameter of 8 and a length of 50 mm with PEL-0,3 wire. L1 contains 120 turns, L2 43 turns, during installation it is necessary to observe the connection diagrams of the beginning and end of both windings indicated in the figure.
The current consumed from the Krona battery does not exceed 30 mA.
Author: John Mosley
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