Frequency divider with adjustable division factor. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Frequency divider with adjustable division factor. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Digital technology

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The figure shows a schematic diagram of a device that allows division of the pulse frequency, and the division factor can be changed up to 30. The device is made on three two-input "AND-NOT" elements. On the elements MC1a and MC1b, a waiting multivibrator is made. At the initial moment, the capacitor C1 is not charged. The potential at the output of the MC1b element will correspond to the potential of a logical unit.

Frequency divider with adjustable division ratio

When the first pulse arrives at the input, it passes through the MC1a element and charges the capacitor. This causes the MC1a gate to close. The time spent by the MC1v element in the closed state is determined by the time the capacitor is discharged through the resistor R1. Until the capacitor is discharged, there will be no pulses at the output of the MS1v element.

After the capacitor is discharged, the device returns to its original state, another pulse enters the input and the process repeats from the beginning.

With a variable resistor, you can change the division ratio from 2 to 30.

Literature

"Electronics" (USA), 1972, No. 10

Publication: N. Bolshakov, rf.atnn.ru

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