Tuesday

                                    Easy projects

  1. Simple Electronic polarity tester circuit
  2. Remote Tester
  3. Fire Alarm Tester



  1. Simple Electronic polarity tester circuit
In this project i have  shown a simple polarity tester that can easily test the polarity of a DC source.With this tester you can test whether the battery connections are right or wrong.  when you connect wrong connection red Led  blink and also buzzer will ring and as connect right connection Green LED blink which indicates that connection is right and save. 

Components required 

  1. Green Led
  2. Red Led
  3. Buzzer
  4. 1k Resistor
  5. Two nobs 1 red and 1 black

Circuit Diagram



2. Remote Tester

   In the project i have made a very simple remote tester Circuit with only Ir Receiver senor which collect signals from the remote and then convert these signals into electrical pulses and LED which is connected with sensor Blink as we press any key of any remote.

Circuit Diagram 


 3.Fire Alarm Tester

This circuit is about fire indicator circuit its very easy and alarm can be attracted with this circuit.

Circuit Diagram.









Saturday

Different circuits to connect directly on 220/110 volt AC main


The post clearly explains how to build LED bulb using many LEDs in series and powering them through 220/110v AC main.Here is a transformer less 220V LED circuit very simple and very easy to build.

Circuit Diagram

This LED's driver build of few components and very less costly


Components 
  1. white LED, 500mW, 45-55 lumen
  2. 47 uF 50v electrolytic capacitor
  3. Bridge rectifier, single phase
  4. 1.5 uF 400V polyester film capacitor
  5. 470 kOhm 1/4 watt resistor




Note: 
All components can be replaced with their nearest value for example you can easily use four 1N4007 diodes in bridge configuration, bridge rectifier is not necessary. 1.5 uf 400v can be replaced with 1.4, 1.1 uf 1.0 uf also even you can connect 2 to 6 LEDs in series.
so its very flexible circuit and very easy to use and change. 

Construction & Working

This circuit is constructed to glow up Few LEDs  in series without any step down transformer,in this circuit AC supply is step down by using polyester capacitor (1.5 uf / 400V), and the more power or less power polyester capacitor can also be used as mentions in the components.After step down the AC  Bridge rectifier components.is used to convert AC current into DC format.After conversion AC to DC electrolytic capacitor at the output of bridge rectifier filters the DC output to reduce the flickering difficeny of LEDsIn the last step LEDs are connected in series because current may be near about 40 to 50v DC.

CAUTION: THE CIRCUIT SHOWN ABOVE IS NOT ISOLATED FROM THE AC MAINS, THEREFORE IS EXTREMELY DANGEROUS TO TOUCH IN POWERED POSITION.




20 LEDs with 220v /110v AC Directly

In this circuit i ave connected 20 LEDs in series directly with 220 AC this circuit also can be connect with 110v AC (where AC power is 110v) the only change should be 10k resistor replace with 20k resistor other components will remain same.

Components Detail

  1. 1*4 IN4007 diode (for bridge)
  2. 20k resistor with power of 10w
  3. 4.7uf capacitor 400v or more power
  4. 20 LEDs wight 



Animated pics of final circuit



CAUTION: THE CIRCUIT SHOWN ABOVE IS NOT ISOLATED FROM THE AC MAINS, THEREFORE IS EXTREMELY DANGEROUS TO TOUCH IN POWERED POSITION.



Friday


Automatic Traffic Light Circuit


As we all know, the name of the project is “Traffic Light Control”. The fundamental idea of this simple electronic project is to control the traffic.  Traffic signal control system is playing very important role in modern age. It is used to control the accident and traffic jam in road in the urban area as well as now it is also used in the rural area where traffic volume is high. Traffic light control system is an automatic sequential system that flashes 3 lights.


Control Lights indicators


  1. RED light – instructs the driver to STOP at the intersection.
  2. YELLOW light – instructs the driver to WAIT (If red light is next) or GET READY (if green light is next)
  3. GREEN light – instructs the driver to GO through the intersection.



Components Required

  1. Transistor BC547 (3 pieces) or any NPN
  2. 470 ohm resistors ( 3 pieces)
  3. 100k,100k (or poenteiometer) 
  4. 100uf 16v  (3 pieces)
  5. 2 LEDs of Green color
  6. 2 LEDs of Red color
  7. 2 LEDs of orange color
  8. 9 to 12v battery or adopter 
  9. 1 Battery connector

Circuit Diagram







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