And again silver water. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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And again silver water. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Medicine

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The scheme of the device is shown in fig. one.

The multivibrator on the trigger DD1.1 serves as a master oscillator. The repetition frequency of its pulses depends on the values of the elements of the timing circuits R3C1 and R4C2. Resistors R1 and R2 only prevent the trigger outputs from being overloaded by the discharge current of capacitors C1 and C2 and do not affect the frequency. The duty cycle of the pulses (in this case, approximately equal to two) does not play any role and can be any, since the DD1.2 trigger changes its state only at the moment the low level at the counting input changes to high. Therefore, the duration of the pulses at the outputs of the trigger DD1.2 always remains exactly equal to the duration of the pauses between them.

And again silver water

Two anti-phase pulse sequences taken from these outputs control a switch on transistors VT1-VT4, periodically changing the direction of the current flowing through the silver electrodes immersed in water. The current is stabilized by the transistor VT5. The exemplary for the stabilizer is the direct voltage drop across the HL1 LED.

The device is powered by a galvanic battery GB1 with a voltage of 9 ... 15 V or from an external source (via connector X2). Diodes VD1 and VD2 automatically switch the device to one of the sources, the voltage of which is greater. They also protect against erroneous polarity of the supply voltage.

The device is assembled as shown in Fig. 2 single-sided printed circuit board. Used resistors MLT-0,125, capacitors C1, C2 - K53-4, K53-10 or other oxide with low leakage current, C3 - oxide of any type, for example, K50-35. All diodes can be replaced by other low power silicon diodes. Instead of KT315G transistors, KT3102 with any letter index is suitable, and KT361G will replace KT3107 also with any index. Switch SA1 - PD9-2, sockets X1, X2 - ONTS-VG-5-16, but others that are suitable in size can also be successfully used.

(click to enlarge)

The electrode holder is the same as in the original version of the device. It is a "blade" made of organic glass 4...6 mm thick, on which plates with an area of approximately 1 cm2 of silver (pure technical or jewelry of the highest standard) are glued on both sides. The places of soldering to the electrode plates of the connecting wires must be above the water level.

The assembled board is placed in a case of suitable dimensions. It can also accommodate a GB1 battery. When setting up the device by selecting a resistor R10, the current in the electrode circuit is set to 16 mA. At this current, the performance of the device is 1 mg of dissolved silver per minute. Knowing it and the volume of water in the vessel, it is easy to calculate the processing time required to obtain the desired metal concentration.

The current stabilizer can be assembled on the integral stabilizer KR1170ENZ, as shown in fig. 3, excluding from the circuit (see Fig. 1) resistor R9, LED HL1 and transistor VT5.

And again silver water

The current is set by resistor R10.

Author: V.Sorokoumov, Sergiev Posad, Moscow region.

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