2B-ATTRACTIVE DISPLAY (NON FADING) BOARD
This project makes your desplay(Advt) board not vading. In this board only one letter appear moving while other remains glowing. You can use this project in your houses,temples and shops and make music attractive.
TECHNICAL DESCRIPTION AND WORKING
This project has been developed and successfully tested OK and TV Engineers Technical Lab.
In this circuit the timer IC 555 and counter IC CD4017 have been employed. The IC 555 is a popular are different manufactures have levelled it NE 555,RC 555,CA 555,XR 555,SE 555 etc. This IC can be employed in Digital as well as analogue circuit. Also it can be used in any input or output of TTL or OMOS circuit. When we feed the supply to the IC,multi vibrator action of IC starts and its output becomes available at its pin No 3. We can adjust its frequency with the help of the pre set look connected at pin No 6. The output of the IC 555 is fed to input pin No14 of IC CD 4017 as positive information for LED. When the first pulse at pin No 3 is in high state all the LEDS connected to this pin fade out while the array of LEDS connects to other pins keeps on glowing as these pins are in Low state. When this pulse becomes available to pin No 2 of CD 4017 the pin comes to high state and pin No 3 and other pins come to LOW state. For example the woud SONY is being displayed, S will lade first and ON will keep glowing. After N,will fade and SOV will appear glowing. This project will thus appear moving onstead of appearing as DISCO light. This project can be taken up as business also.
PRECAUTIONS WHILE ASSEMBLING
1.Check all the components as per the circuit.
2.While connecting diodes,be sure of its anode and cathode.
3.Avoid short circuit while soldering. Clean the prints properly.
4.Use IC Base for mounting IC
LEST OF COMPONENTS
TESTED OK ELECTRONICS PROJECTS
1.Any modification in the circuits/projects will be immediately published in the following issue of TV Engineer. This facility is not ther ewith other similar publications
2.Projects complete in all respect are available for Demontration and sale. Our Lab Develops new projects every month which will be published in other volumes of the series. The monthly megazine TV Engineer will always reflet current price and information an new projects. Be sure to read regularly.