Probe for checking installation. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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Recently, a small-sized (dimensions 10x12 mm) electromagnetic sound emitter HCM 1201X has appeared on sale. It has a built-in generator with a frequency of about 2300 Hz, the generator supply voltage is 1,5 V, the current consumption is not more than 20 mA. Operation is maintained when the voltage drops to 0,8 V, while the current consumption decreases to 6 ... 8 mA.
On the basis of this emitter, it is easy to make a "probe-probe", the diagram of which is shown in the figure. There are only three elements in it: the mentioned sound emitter BF1, a variable resistor R1 of the SP5-1 type and a galvanic cell G1 of the AA standard or a disk battery. During installation, it is necessary to observe the polarity of the radiator connection: the positive terminal is longer.
Before work, the probes are closed to each other and, by rotating the resistor knob, increase the resistance until the sound stops. By turning the knob in the opposite direction at a small angle, the generation is set at the very threshold. At the same time, the connection is clearly distinguished by conductors (there is sound) and through open transitions of powerful transistors and diodes (there is no sound).
When working with the device, it must be borne in mind that a rather large current (6 ... 20 mA) flows through the circuit under test, which can be dangerous for especially sensitive devices, for example, microwave diodes and transistors.
Author: I. Gorodetsky, Moscow
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