Sound probe. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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In the manufacture of printed circuit boards, it is usually necessary to check the integrity of the printed conductors and the absence of short circuits between them before soldering the elements. Such operations often have to be performed during the repair of various equipment. For these purposes, pointer and digital multimeters are inconvenient, since they require simultaneous monitoring of the instrument reading and control over the connection of measuring probes to the desired points of the device or board. In such cases, an audible indication is much more preferable, so a probe is very useful, signaling a short circuit with an audible signal.
Rice. 1 Schematic diagram of the probe
A diagram of such a device is shown in the figure. The basis of the probe is an inductive feedback generator assembled on a VT1 transistor and a HA1 telephone. The TK-67-NT-2 telephone used in the device has two coils connected in series. The phone must be opened and separate conclusions drawn from each coil. The probe is powered by a 3 V battery. If there is no generation when it is first turned on, it is necessary to swap the leads of one of the coils.
Author: N. Dekin, Dolgoprudny, Moscow Region; Publication: radioradar.net
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