60 Hz from the clock resonator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Radio amateur designer
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To power an electronic watch, and possibly other equipment made in the USA and some other countries, a voltage with a stable frequency of 60 Hz is required. In the presence of a quartz resonator at a frequency of 1966,08 kHz, it is not difficult to obtain it (see, for example, the article by V. Polyakov "60Hz Clock Power Converter"in "Radio", 2000, No. 3, p. 28). However, it is not always possible to buy such a resonator, so we recommend using a 60 Hz pulse generator, which uses a "clock" resonator at a frequency of 32768 Hz (see figure).
The master oscillator is assembled on the element DD1.2 according to the traditional scheme. Element DD1.1 - buffer. DDT.3 inverter, excluding the so-called "race" at the inputs of the element DD1.4. The up/down counter D02 for every 16 input pulses generates at its output P a low-level carry signal with a duration equal to the period of the input pulses. As a result, out of 16 pulses, only 4 pass through the DDI.15 element. The average signal frequency at the output of this element is 32768x15/16=30720 Hz. The DD3 chip divides this frequency by 512. and at its output 28 pulses are formed with a duty cycle of 2 (meander) and a frequency of 60 Hz.
As DD1, only microcircuits of the K561 and 564 series can be used, since elements of other CMOS series do not work in a crystal oscillator. The functions of the counter DD2 can also be performed by the K561IE14 chip, but then its input B (pin 9) must be connected to the positive power wire to set the binary counting mode.
The exact frequency of the generator is set by selecting capacitors C1 and C2. The frequency meter should be connected to the output of the element DD1.1. The fact is that the pulses at the output of the DD3 microcircuit are somewhat uneven in time. This does not affect the course of the clock in any way, but it interferes with the precise setting of the frequency when it is controlled (by the pulse period) at the output of the DD3 microcircuit.
Author: S. Biryukov, Moscow
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