Products
Rewards
from HOLOOLY

We are determined to provide the latest solutions related to all subjects FREE of charge!

Enjoy Limited offers, deals & Discounts by signing up to Holooly Rewards Program

HOLOOLY

HOLOOLY
TABLES

All the data tables that you may search for.

HOLOOLY
ARABIA

For Arabic Users, find a teacher/tutor in your City or country in the Middle East.

HOLOOLY
TEXTBOOKS

Find the Source, Textbook, Solution Manual that you are looking for in 1 click.

HOLOOLY
HELP DESK

Need Help? We got you covered.

## Q. 36.2

What does the circuit of Fig. 36-8 do?

## Verified Solution

This is one way to create a 60-Hz clock, a square-wave signal used as the basic timing mechanism for inexpensive digital clocks. The transformer steps the line voltage down to 12 Vac. The diode clamps then binds the input to$\pm$ 0.7 V. The inverting comparator produces an output square wave with a frequency of 60 Hz. The output signal is called a clock because its frequency can be used to get seconds, minutes, and hours.

A digital circuit called a frequency divider can divide the 60 Hz by 60 to get a square wave with a period of 1 s. Another divideby- 60 circuit can divide this signal to get a square wave with a period of 1 min. A final divide-by-60 circuit produces a square wave with a period of 1 hr. Using the three square waves (1 s, 1 min, 1 hr) with other digital circuits and seven segment LED indicators, we can display the time of day numerically. The 60-Hz ac power line maintains a frequency precision of better than 0.1% so timing accuracy is very good.