Hidden wiring indicator on microcircuits. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Indicators, detectors, metal detectors
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scheme concealed wiring indicator shown in fig. 1. It consists of two nodes - an AC voltage amplifier based on a micropower operational amplifier DA1, and an audio frequency oscillation generator assembled on an inverting Schmitt trigger DD1.1 of the K561TL1 microcircuit, a frequency setting circuit R7C2 and a piezoelectric BF1.
When the WA1 antenna is located close to the current-carrying wire of the mains, the EMF of the industrial frequency of 50 Hz is amplified by the DA1 microcircuit, as a result of which the HL1 LED lights up. The same output voltage of the operational amplifier, pulsating at a frequency of 50 Hz, starts the audio frequency generator.
The current consumed by the device's microcircuits when powered from a 9 V source does not exceed 2 mA, and when the HL1 LED is turned on - b ... 7 mA. The power source can be a battery 7 D-0,125, Corundum or similar foreign production.
Sometimes, especially when the desired electrical wiring is located high, it is difficult to observe the glow of the HL1 indicator and an audible alarm is quite enough. In this case, the LED can be turned off, which will increase the efficiency of the device. All fixed resistors - MLT-0,125, tuned resistor R2 - type SPZ-38B, capacitor C1 - K50-6. The WA1 antenna is a foil pad on a board about 55x12 mm in size.
(click to enlarge)
The circuit board is placed in a case made of dielectric material so that the antenna is in the head part and is as far away from the operator's hand as possible. On the front side of the case there is a power switch SA1, an LED HL1 and a sound emitter BF1. The initial sensitivity of the device is set by a tuning resistor R2. An unmistakably mounted device does not need to be adjusted.
Publication: cxem.net
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