Simple oscilloscope. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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Using transistors in the so-called avalanche mode (Radio No. 9, 1972), a simple oscilloscope can be made to observe low-frequency processes in the range from 30 Hz to 20 kHz.
The oscilloscope is made with only three transistors. The first stage is a vertical deflection amplifier based on the P26A - P26B transistor. The second stage is a sweep generator based on the P416A, B transistor. And the third stage is the sweep generator amplifier, where you can use transistors with a voltage of Ukemax = 70-100V (P26B). Oscilloscope tube type 5LO38 or LO247.
Resistor R1 regulate the amplitude of the input voltage. Switch S1 sets the sweep frequency roughly, and smoothly - with potentiometer R10. The synchronization amplitude is set by the potentiometer R6. The vertical and horizontal offsets are set respectively by potentiometers R9 and R12. Brightness - R21, focus - R22. The power of the power transformer is about 8 watts.
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Publication: N. Bolshakov, rf.atnn.ru
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