Two beams from one. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Two beams from one. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Measuring technology

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Using a relatively simple electronic switch (Fig. 1), two signals can be observed simultaneously on the screen of a conventional single-beam oscilloscope. Let's get acquainted with the operation of the device. The clock generator, assembled on the logic elements DD1.1 and DD1.2, generates rectangular pulses with a frequency of 25 kHz and a duty cycle equal to 2. From the output of the generator (pin 4 DD1.2), the pulses are fed to the buffer elements DD1.3 and DD1.4 , from the outputs of which the antiphase voltages alternately close the diodes VD2, VD3, included in the circuits for the passage of the studied signals.

Since the base of the emitter-follower transistor VT5 is connected through a limiting resistor R21 to the cathodes of these diodes, rectangular clock pulses are emitted on the resistor R22. Their amplitude (the distance between the middle lines) depends on the position of the slider of the variable resistor R2 - in the upper position according to the scheme, the amplitude of the pulses is the largest, in the lower - the smallest. If now the signals under investigation are applied to inputs I, II, then on the oscilloscope screen (with a sweep duration of 10 μs) a pulse

Two beams from one
Fig.1. Schematic diagram of the switch for the oscilloscope

Two beams from one
Fig.2. Waveform on the oscilloscope screen: 1 - pulse of the clock generator, 2 - the first signal under study, 3 - the second signal under study

Two beams from one

Two beams from one
Fig.3. Switch circuit board with component layout

With a longer sweep duration (1 ms), both studied signals can be observed on the oscilloscope screen. Their amplitudes and the distance between the signals are set by changing the position of the sliders of the variable resistors R1, R6 and R2, respectively. The frequency of the clock generator depends on the capacitance of the capacitor C3 and the resistance of the resistor R14.

The K164LA7 chip can be replaced with the K164LE5, K564LA7, K564LE5 MS, as well as with the K176LA7, K176LE5, K561LA7, K561LE5 MCs. When using the latter elements, the printed circuit board for the microcircuit pins will have to be changed. Instead of KT315B transistors, you can use any semiconductor devices of the same series, KT3102A is also suitable. The current transfer coefficient for all transistors is 40-100. It is desirable that the parameters VT1, VT3 and VT2, VT4 are the same. Diodes KD522A can be replaced with KD521A or KD510A, VD5 - D9 or D2 series. Fixed resistors - MLT-0,125 or VS-0,125, variables - SPO-0,5 or SP-1 of group A. Capacitors KM or K10-7V. The switch is assembled on a printed circuit board (Fig. 3) with a size of 65 x 52 mm made of foil fiberglass 1,5 mm thick

The DD1 chip is installed on the side of the printed conductors, and the remaining elements are on the opposite side. The board is placed in a plastic case measuring 125 x 70 x 20 mm, on which the input and output sockets, variable resistors, and a power switch are installed. The switch is powered by a Krona battery or an independent source. The consumed current does not exceed 10 mA. If the radioelements are in good order, the device starts working without configuration.

Author: A.Proskurin

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