DS

Now Build a 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 à 0001 0000 0000. To make a transformation successfully we must force the pulse from 59 to 60 0011 1001 à 0100 0000 on the output of the BCD counter. Digital Stopwatch 0-60 sec Circuit Diagram  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.

DIGITAL COUNTING CIRCUIT A simple Digital counting circuit, which will counts from 00 to 99. The counter will incremented by one for each pulse given in the terminal A and B. The pulse can be given by just short circuiting the end points A and B. You can use this circuit for a wide variety of applications such as, for Digital Entry Counter, Speedometer circuit, distance measuring devices etc. CIRCUIT DIAGRAM WORKING PRINCIPLE The 555 timer is wired as an ASTABLE MULTIVIBRATOR, which will generate an output for each pulse given in the terminal A and B. The output is taken from pin 3 and is directly given to the clock input (1) of decoding IC CD4033. CD 4033 is used here as 7 segment Display Driver. The Cout from this IC is given to another CD4033 IC. Which will drive another 7 segment Display. The 7 segment display used here is of Common Cathode type. So the pin 3 is connected to ground. You can increase the number of bits to count in this circuit (99999......) Other useful Links:- INTE...

    The Nexus 6 would have a 5.9 inch screen with QHD resolution (2K), 13 megapixel camera with optical image stabilizer and a metal frame and the new version Android L. The Google phone, Nexus, will continue to grow after all Nexus 6 and come with a 5.9 inch screen, multiple rumors say. Although the photo is an image (render) created by Android Police, every detail which is present in this Nexus 6 has been based on rumors you've heard the blog and that have circulated on the Internet. According to AP, the official name of the new Google phone, manufactured by Motorola, Nexus 6 (Shamu) and would be called based on the new Moto X design, but in a larger size, black front speakers and a metal frame around cell. The back of the Nexus 6 include a 13 megapixel camera with optical image stabilization, dual flash, 3200mAh + battery, a front 2-megapixel camera and QHD (2K) screen. With these reports on the Nexus 6 hope this be a new cell showed both is size and its features and compon...

This is the Simple 0-30 Volts - 2-5A Variable Power Supply Circuit Diagram. This is a high quality power supply with a continuously variable stabilized output adjustable between 0 and 30VDC. the LM 723 is the heart of the power supply which drives the BD137 and then the 2N3055. The circuit provides short circuit protection. And has great stability at voltage changes. Drive the circuit with 24 Volts 3A from a transformer. the 2N3055 needs a good heat sink. 0-30 Volts - 2-5A Variable Power Supply Circuit Diagram :