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 / Radio amateur designer

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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 DD1.1 and DD1.3, a waiting multivibrator is made. At the initial moment, the capacitor C1 is not charged. The potential at the output of the element DD1.1 will correspond to the potential of the logical unit.

Frequency divider with adjustable division ratio

When the first pulse arrives at the input, it passes through the DD1.1 element and charges the capacitor. This leads to the closing of the logical element DD1.1. The time spent by the element DD1.3 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 element DD1.2.

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.

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