Tunable rectangular pulse generator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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The tunable square-wave generator consists of a multivibrator on transistors V2, V6 and V3, V4 with a tunable repetition rate and a measured duty cycle and two key stages on transistors V1 and V5.
The threshold of operation of the key stages is determined by the diode V7. Changing the duty cycle of the pulses is carried out by a variable resistor R4, and frequency tuning is carried out by a resistor R5.
With the values of the elements indicated in the diagram, the rectangular pulse generator is tuned linearly in frequency in the range from 5 to 500 Hz and in the duty cycle from 2 to 5. With a load resistance of 620 ohms, the pulse amplitude is almost constant and equal to 5 V. The current consumed by the generator is 3 mA.
Transistors MP116 can be replaced with MP114, MP115, and MP113 with MP111, MP 112.
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