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Study the working decoder for conversion of BCD into 7segment display code

Posted by: seminar class
Created at: Friday 13th of May 2011 06:11:02 AM
Last Edited Or Replied at :Friday 13th of May 2011 06:11:02 AM
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CD to 7-segment code. The IC makes this process. It has four inputs called BCD inputs and seven outputs to drive the display.
For common anode LED display, the decoders used are IC 7446, IC 74246, IC 7447, IC 74247 etc. They have active low, open collector outputs.
And for common cathode LED display, the ICs are IC 7448, IC 74248, IC 7449 etc. They have active high, open collector outputs.
Working of the circuit –
1) When BCD inputs from 0000 to 1001 are applied at the input terminals, the IC produces equivalent outputs at its output terminals from a–g. The 7–seg display is..................[:=> Show Contents <=:]

Automatic car parking system

Posted by: seminar project explorer
Created at: Monday 14th of March 2011 06:35:25 AM
Last Edited Or Replied at :Friday 12th of October 2012 02:54:42 AM
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ht falls on this circuit (Fig:-) the resistance value is reduced, which results in the passage of current through the base turning the transistor ON. Thus the collector voltage is low and the output obtained is low. But once the signal is cut the collector voltage level increases ,resulting a high output.


This section is the heart of the entire system. It consists of a 2:4 decoder and flip-flops, which are used for sequence detection. The 74155 dual 2:4 decoder receives its select signals at pins 13 (A) and 3 (B)..................[:=> Show Contents <=:]


Posted by: seminar class
Created at: Monday 28th of February 2011 02:22:18 AM
Last Edited Or Replied at :Thursday 04th of April 2013 11:34:57 AM
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t depending resistor in which resistance varies when a person cross by. The LDR get activate when the light gets cut. Two sensors are applied in which the sensor I is used to open the door and to count. And sensor II is used to close the door. Their output is leading to control unit.
Control Unit consists of an S-R flip flop in which the voltage from the sensors is fed to set, reset pins. One of the outputs is fed to open the door and the other is fed to counter.
Here we use down counter in which when a person is entered the count is decremented.
DO..................[:=> Show Contents <=:]

digital electronics project

Posted by: project topics
Created at: Wednesday 29th of December 2010 06:53:16 AM
Last Edited Or Replied at :Friday 23rd of November 2012 02:14:52 AM
single chip timer with digital clock and calender, multi melody generator with instrumental effect , a single chip timer with digital clock and calender, nending machine project in vhdl , staircase climbing robot rf controlled kit price, vending machine using vhdl project , a single chip timer with digital clock and calendar project, www indvidval com , 4 digit 7 segment multiplex display, vhdl fpr cw receiver , electronic voting m c vhdl code, plc based object counter using conveyor belt , electronic dice using at89c2051, wireless biomedical monitoring system , digital electronics, digital electronics project , digital electronics project ideas,
Fire Alarm
183. Versatile Probe
184. Color Identifier Robot
185. Luggage Security System
186. Colour Sensor
187. Automatic room light controller with load variation
188. 7MHz CW/AM QRP Transmitter
189. Remote Audio Level Indicator
190. Dish Position Controlling & Monitoring System Used For Radar &
191. Little Door Guard
192. RFID based Access Control System with PC Logging
193. Under-Over-Voltage Beep for Manual Stabiliser
194. Security Alert System For Industries with Smoke Sensor
195. Project Name
196. Crystal-Controlled Time-Base Generator
197. Application
198. Micro cont..................[:=> Show Contents <=:]

electronics project design

Posted by: project topics
Created at: Wednesday 29th of December 2010 06:52:46 AM
Last Edited Or Replied at :Wednesday 29th of December 2010 06:52:46 AM
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186. Shrimp
187. Radio Frequency Beacon Finder
188. Automatic Gear Control With Rpm Counter
189. Low-Cost Hearing Aid
190. Micro Controller based washing machine
191. Intelligent sensor based industrial fire detector
192. Ramp Controlled Light
193. Remote-Controlled Power-Off Switch
194. RF Based Message Transfer Between 2 PC's
195. Electrical Equipment Controller
196. Stepper Motor control Via Parallel Port
197. Sensor-Actuator Interfaces For Microcontroller - -Channel
198. Dual Axis
200. Implementatio..................[:=> Show Contents <=:]

electronics project for final year

Posted by: project topics
Created at: Wednesday 29th of December 2010 06:24:05 AM
Last Edited Or Replied at :Wednesday 29th of December 2010 06:24:05 AM
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Code Modulation.
221. Image blur reduction using adaptive tonal correction
222. Electric Guitar Preamplifier
223. Ready -To-Use Object Counter
224. Project Name
225. Noise cancellation of Speech/audio using adaptive equalizers
226. Wiper Speed Controller
227. Telecom Headset
228. Moblie Sniffer
229. Image compression using DWT
230. Industrial Protection System Using Light Dependent Resistor
231. 3-D Axis
232. Anti Theft Alarm For Bikes
233. Infrared Remote Control Timer
234. With Water Tank &Pump
235. U.S.B. Connectivity To Micro Controller
236. Robot For Filling Machi..................[:=> Show Contents <=:]

Simple digital stopwatch using at89s51 Microcontroller

Posted by: project report helper
Created at: Thursday 14th of October 2010 05:57:00 AM
Last Edited Or Replied at :Tuesday 19th of March 2013 02:19:53 AM
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[attachment=607..................[:=> Show Contents <=:]


Posted by: project report tiger
Created at: Thursday 04th of March 2010 03:43:51 AM
Last Edited Or Replied at :Thursday 04th of March 2010 03:43:51 AM
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alid tone input is produced.
By selecting adequate external RC value, the min-im..................[:=> Show Contents <=:]

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