Digital oscilloscope. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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Roman Krause developed a digital oscilloscope with output to a matrix of 100 (square of 10 rows x 10 columns) LEDs. The input voltage through two dividers 1:10 WL1 or directly (in the latter case, the sensitivity is maximum - 20 mV / division) through R6 is fed to an amplifier with Ku = 10 (US1A).
(click to enlarge)
Further, the signal branches to US3 - a specialized IC of a linear LED level indicator and to an amplifier-comparator (Ku=1000) US2A. US3 is active in the "running dot" mode, i.e. the voltage level is displayed as a linear dot on one of the "columns" of the LED matrix. Multivibrator US4 and counter US5 "sweep" the columns of the matrix horizontally, and US2B through diode D5 resets counter US5 according to the voltage drop at the output of US2A, i.e. essentially performs a "sweep" synchronization.
The sensitivity of the device is calibrated with a trimmer P4, the synchronization stability is adjusted with a resistor R2, the sweep frequency is smoothly adjusted with a resistor R3 or a coarse switch WL2 (10 Hz-10 kHz / 100 Hz-100 kHz). WL3 toggles the sweep timing mode - standby/continuous.
Author: Roman Krause; Publication: N. Bolshakov, rf.atnn.ru
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