Electronic biolocator. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Electronics in medicine

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Dowsing is known as an ancient method of determining groundwater, ore and oil deposits using a vine or the so-called dowsing. There is a hypothesis of the mechanism of this phenomenon, according to which flowing water or ore deposits change the electric field of the earth's layer and thus affect the hybrid "receiver" - a man with a vine in his hand.

The described electronic device is a sensitive indicator that responds to an electric field, which can be amplified, thus determining the occurrence of groundwater or the presence of hidden electrical wiring in the walls of buildings.

The device is made on the basis of two operational amplifiers and three electronic switches powered by a bipolar source. A telescopic antenna is connected to the output of the first amplifier, which is connected as a voltage follower with a high input impedance. Its potential relative to the ground depends on the parameters of the electric field. The positive and negative charges "caught" by the antenna change the voltage at the output of the first amplifier, which, through the switch K1, is fed to the input of the second amplifier with the possibility of adjusting the gain.

The other two keys - K2 and K3 - operate in time with the frequency that the multivibrator produces on the integral timer DA2. The key K3, connected to the antenna, is connected to the potentiometer R6, while the voltage at the compensator C3 and the control output of the key is approximately equal to the algebraic sum of the antenna voltage and that set by the potentiometer R6. On the other hand, the sensitivity of the first amplifier relative to the antenna depends on the frequency with which the capacitance C2 is discharged through the switch K3.

(click to enlarge)

The frequency of the multivibrator can be changed by potentiometer R1 and switch S2, thus adjusting the sensitivity of the device over a wide range. The overall sensitivity of the electronic biolocator also increases when the switch S2 is in the closed position.

Instead of the amplifiers DA1.1 and DA1.2 indicated on the diagram, you can use any operational amplifiers with a low input current. From domestic microcircuits, operational amplifiers K140UD8, K140UD13, K140UD18, K140UD22, K544UD1 are suitable. The most convenient in this circuit is a two-channel operational amplifier of the K574UD2A, B type. However, when replacing amplifiers, it is necessary to apply the appropriate correction circuits, as well as change the power supply of the circuit.

Integrated circuit DD1 (4066) contains four analog keys, three of which are used in the circuit. Of the domestic microcircuits, bidirectional switches of the KR1561KTZ type are most suitable for replacement. Instead of the integrated timer DD2 (7555), you can use the domestic analogue K1006VI1. The measuring head is designed for a current of 50 - 500 mA. Diodes VD1, VD2 - any germanium.

Literature

1. Sp. "Amaterske Radio - B", br.2,1989, 8 "Radio, television, electronics", 89/XNUMX.

Author: Metodi Tsakov; Publication: N. Bolshakov, rf.atnn.ru

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