Acoustic probe. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Indicators, detectors, metal detectors
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The magazine "Amaterske Radio" offers a simple sound probe circuit for detecting logic levels; low (logical 0) and high (logical 1).
The device consists of a two-tone multivibrator made on two elements D1.1, D1.2 of the D1 microcircuit, and two keys assembled on three transistors V2-V4 (see schematic diagram).
When the probe is connected to the output of the device under test, which is energized at 2,4 V or higher (logical 1), transistor V4 opens, capacitor C2 is connected to the common wire and the multivibrator starts to work. And since the capacitance of C2 is half that of C1, the sound emitted by the driver B1 will be high.
When the probe is connected to a point under the logic 0 potential (0,8 V or less), V4 will be closed, but transistors V2, V3 will open, and capacitor C1 will be connected to a common bus. In this case, the frequency of the multivibrator will become an octave (twice) lower than with a logical 1.
It is permissible to use silicon transistors KT104, KT203, KT361 (V2) and KT315, KT312 (V3, V4) in the probe.
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