Electronic Biolocator Device for searching oil, ore
Biolocation is known as the ancient method of determining subsurface water, ore and oil deposits using a vine or so-called dowsing . There is a hypothesis of the mechanism of this phenomenon, according to which the current water or ore deposits change the electric field of the earth’s reservoir and thus affect the hybrid "receiver" - a person with a vine in his hand.
The described electronic device is a sensitive indicator that reacts to an electric field, which can be enhanced, thus determining the occurrence of subsurface water, minerals 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 with power from a bipolar source. A telescopic antenna is connected to the output of the first amplifier, which is included as a voltage follower with a high input impedance. Its potential relative to the earth depends on the parameters of the electric field. Positive and negative charges "caught" by the antenna change the voltage at the output of the first amplifier, which through the key K 1 is fed to the input of the second amplifier with the possibility of gain control.
Two other keys - К 2 and КЗ - act in time with the frequency that the multivibrator produces on the integrated timer DA2. The short-circuit key connected to the antenna is connected with the potentiometer R6, while the voltage at the compensator NW and the control output of the key is approximately equal to the algebraic sum of the antenna voltage and that given by potentiometer R6. On the other hand, the sensitivity of the first amplifier relative to the antenna depends on the frequency with which the capacitance C 2 is discharged through the short-circuit key.
The frequency of the multivibrator can be changed by a potentiometer R1 and a switch S2, thus adjusting the sensitivity of the device in large limits. The overall sensitivity of the electronic biolocator also increases with the closed position of the switch S2.
Instead of the amplifiers DA1.1 and DA1.2 indicated in the circuit, it is possible to use any operational amplifiers with a small input current. From domestic chips, operational amplifiers K140UD8, K140UD13, K140UD18, K140UD22, K544UD1 will do. The most convenient in this scheme is a two-channel operational amplifier of the type K574UD2A , B. However, when replacing amplifiers, it is necessary to apply the appropriate correction circuits, as well as change the power supply of the circuit.
The integrated circuit DD1 (4066) contains four analog keys, three of which are used in the circuit. From domestic microcircuits for replacement, bidirectional switches of type KR1561KTZ are most suitable. 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.
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