Electronic projects

you are here: home page :: projects :: Miscellaneous :: Miscellaneous :: Digital Stopwatch 0-60sec

Digital Stopwatch 0-60sec

By using the same circuit of the "Digital Stopwatch 0-99sec", we can add an AND gate, and transform the 0 99sec stopwatch to a 0 60sec stopwatch.
We must find a way to control the RESET function of the BCD counter, which is responsible for the counting of the seconds. As we studied above, the circuit resets when we have 99 to 100, that is 1001 1001 0001 0000 0000. To make a transformation successfully we must force the pulse from 59 to 60 0011 1001 0100 0000 on the output of the BCD counter.
By placing the AND gate, with its inputs on the Q1 and Q2 of the BCD counter of the decades, we make sure that when the gate closes, the RST input of the BCD counter will be set to logical 1, which on its turn, will force the circuit to start over. The transformed circuit appears in picture 2.

Circuit diagram

author: Koukos Konstantinos, Tsormpatzidis Dimitrios - Aristotle University of Thessaloniki
web site: http://www.electronics-lab.com
project categories:
folder Audio (49)
folder Power & high voltage (43)
folder Radio (23)
folder Light & LED (31)
folder Tools & measurement (40)
folder Telephone (18)
folder Automotive (10)
folder Microcontrollers (12)
folder Sensors & control (47)
folder Timers & oscillators (40)
folder Miscellaneous (26)

StumbleUpon button

Share this page
Bookmark and Share
project subcategories:
All subcategories

similar projects:
7 Segment LED Counter
Cuckoo sound Generator
Digital Step-Km Counter
Digital Stopwatch 0-99sec
Downed Model Locator
Downed Model Locator II
Economy radar detector
Electronic Locker
IR Remote Control Jammer
Keys Finder

recently added projects:
Doorbell for the Deaf
High Quality Intercom
Combinational Conjuring Trick
Ultrasonic Dog Whistle
Quiz Circuit
LED Torch
Insect Repellant
Speaker Microphone Circuit
Magic Wand Conjuring Trick.

most popular projects:
Led display digital Voltmeter
500W low cost 12V to 220V inverter
Low pass filter - Subwoofer
Metal Detector
High And Low Voltage Cut Off With Time Delay
Basic UPS Power Supply
2N3055 Power Amplifier
200W audio amplifier
LED Torch
100W RMS Amplifier

DIY Electronics Projects

Promote Your Page Too