Network control. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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Typically, probes with neon bulbs are used to detect mains voltage. It is quite simple to assemble a control device, the diagram of which is shown in the figure.
The circuit consists of a transformerless rectifier, a stabilizer and an audible alarm on transistors VT1 and VT2. When the probe probes are connected to the network, the circuit receives a stabilized 5 V power supply, and the sound generator is triggered. Installation is carried out in a hinged way. Resistors - type MLT. Capacitors C1 and C2 - K73-17, C3 and C4 - any electrolytic, transistors VT1 and VT2 can be replaced with any low-power ones with an appropriate conductivity structure. Dynamic head with voice coil impedance 6 - 10 Ohm.
The device must be assembled in a plastic durable case. Particular attention should be paid to the insulating properties of the enclosure, as is required when working with transformerless designs. The desired tone of the signal can be selected by the capacitance of the capacitor C4.
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