Mini probe on discrete elements. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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In the article by E. Zuev "Probe for testing audio equipment" in "Radio", 1999, No. 8, p. 68 talked about a small-sized probe on the K174XA10 microcircuit, with which you can trace the passage of a 3-hour signal through amplifier stages of various equipment and detect malfunctions.
If there is no specified microcircuit, the probe is easy to perform on discrete elements (see figure). It is also small-sized and allows you to listen to the signal by touching the probe directly to the outputs of the magnetic head, for example, the player or the outputs of the details of the amplifying cascades.
In addition to those indicated in the diagram, transistors KT315G, KT315E with a current transfer coefficient of more than 100 are suitable. Oxide capacitors - K50-35 or other small ones. Fixed resistors MLT, variable R1 - SP3-4aM. The X3 connector includes a small headphone (or stereo phones) with as much impedance as possible. Probe X1 (they touch the terminals of the parts of the stages under test) - a piece of copper wire with a diameter of 2 mm and a length of 70 mm, X2 (it is connected to the common wire of the controlled structure) - a crocodile clip connected to the parts of the probe with a stranded mounting wire.
The probe is powered either from an autonomous source or from a battery design.
The device is adjusted with a supply voltage of 9 V. First, by selecting resistor R2, the voltage on the collector of transistor VT1 is set to approximately 4 V. Then, the phone is connected to connector X3 and, by selecting resistor R5, the voltage on the collector of transistor VT2 is set equal to half the supply voltage.
When working with a probe, a variable resistor is used to set the sound volume in the phone so that there is no distortion.
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