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| Monday, July 6, 2009 |
12 STAGE NEON SEQUENCER-NE2/NE51
This circuit is similar to the LED clock using 12 neon indicator lamps instead of LEDs. It operates from 2 high capacity ni-cad cells (2.5 volts) which keep it going for a couple weeks. High voltage (70 volts) for the neon lamps is obtained from a small switching power supply using a 74HC14 Schmitt trigger squarewave oscillator, high voltage switching transistor, and 10 mH high Q inductor. Most any small PNP transistors can be used that have a C/E voltage rating of 80 or more. The inverter stage (pins 5,6) is not needed and is just an extra stage. An adjustable low frequency oscillator made from two of the inverter stages generates the clock signal for the 74HCT393 binary counter. In this circuit, the timing capacitor should be non-polarized since the capacitor will charge in both directions, so two 6.8 uF tantalum caps were used back to back which yields about 3.3 uF. The 75K resistor in series with pin 1 limits the current through the input protection diodes when the capacitor voltage exceeds the supply voltage. This resistor may not be necessary with small capacitors at low voltage but was added as a precaution. The binary counts are decoded into 1 of 12 outputs by the 74HCT138 decoders and operates the same way as in the 28 LED clock circuit. The sequence can be extended to 16 by omitting the reset circuit and tying pins 2 and 13 of the counter to ground.
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TOTAL CIRCUIT OF THIS PROJECT
GAME SHOW INDICATER WITH LIGHTS-WHO’S FIRST
The circuit below turns on a light corresponding to the first of several buttons pressed in a "Who's First" game. Three stages are shown but the circuit can be extended to include any number of buttons and lamps.
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TOTAL CIRCUIT OF THIS PROJECT
AUTOMATED MULTISTORED
CAR PARKING SYSTEM
Automatic multistoried car parking system helps to minimize the car parking area. In the modern world, where parking-space has become a very big problem and in the era of miniaturization, it is become a very crucial necessity to avoid the wastage of space in modern, big companies and apartments etc. In places where more than 100 cars need to be parked, this system proves to be useful in reducing wastage of space. This Automatic Car Parking System enables the parking of vehicles, floor after floor and thus reducing the space used. Here any number of cars can be parked according to the requirement. This makes the system modernized and even a space-saving one.
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TOTAL CIRCUIT OF THIS PROJECT
ELECTRONICS HOUSE
To develop security system for houses and to save electric power.
Scope : This project proposes the development of security system for farm houses and residential houses
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TOTAL CIRCUIT OF THIS PROJECT
CELLULAR PHONE CALLING DETECTOR
This circuit was designed to detect when a call is incoming in a cellular phone (even when the calling tone of the device is switched-off) by means of a flashing LED.
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TOTAL CIRCUIT OF THIS PROJECT
BICYCLE BACK SAFETY LIGHT
This circuit has been designed to provide a clearly visible light, formed by 13 high efficiency flashing LEDs arranged in a pseudo-rotating order. Due to low voltage, low drain battery operation and small size, the device is suitable for mounting on bicycles as a back light, or to put on by jogger/walkers.
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TOTAL CIRCUIT OF THIS PROJECT
SIMPLE LIE DETECTOR
Here's a simple lie detector that can be built in a few minutes, but can be incredibly useful when you want to know if someone is really telling you the truth. It is not as sophisticated as the ones the professionals use, but it works. It works by measuring skin resistance, which goes down when you lie.
CLICK HERE TO DOWNLOAD
TOTAL CIRCUIT OF THIS PROJECT |
posted by technical projects @ 7:58 PM  |
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Name: technical projects
Home: sirpur kaghaznagar, andhra pradesh, India
About Me: Hi this is udaya bhasker.i just completed my engineering in hyderabad.
i completed my technical education in raja mahendra engineering college.ibrahimpatnam
See my complete profile
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