2014-04-18 05:11
This circuit lets you turn on/off a fan by just directing torchlight or other light toward its light-dependent resistor (LDR). The circuit is powered from a 5V power supply.Preset VR1 and… Read More
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Engineers Blog
electroninnovation.blogspot.com
A blog for Electronic Engineers.This blog includes some information about leading technologies in electronics field and many free simple circuits including microcontroller projects for beginners.the basic electronic components are explained here
2014-04-18 05:06
A key chain with a built-in white LED comes in handy to help you at your front door or search your valuables in the dark. The intensity of white LED is 4000 to 5600 mcd (millicandela) at… Read More
2014-04-17 18:04
This handy mobile bug or cell phone detector, pocket-size mobile transmission detector or sniffer can sense the presence of an activated mobile cellphone from a distance of one and-a-half… Read More
2014-04-17 17:55
Here, a mechanism is presented by which fused fluorescent lamp can be enlighted: In this model, only healthy filament… Read More
2014-04-17 17:41
Here is a simple battery charger circuit diagram:Click on the image to enlarge it: You can see the values of the components used below:R1: 56 giga ohms resistorR2: 220 Mega ohms… Read More
2014-04-17 17:40
Nowadays mobiles can also be charged using the USB outlet of PC. The mobile charger circuit presented in this project can give 4.7V of synchronized voltage for charging the phone. As USB o… Read More
2013-02-28 18:00
Want to switch mains appliances on and off remotely? This UHF Remote Mains Switch can do it for you. It’s operated using a handheld UHF transmitter, and an in-built timer also enable… Read More
2013-02-28 17:54
SOME modern freezers contain alarms which sound if you leave the door open and allow the internal space to warm up. However, they do not work if the freezer suffers a power failure, which… Read More
2013-02-28 17:51
” It just takes 20 seconds to recharge !!! “Here is an interesting project which uses capacitors to store energy instead of chemical,sit uses an different type of capacitors cal… Read More
2013-02-28 17:44
House plants in general often have a pretty hard time of it compared to their garden bound cousins, which seem to get more than their fair share of watering, even if their owner forgets… Read More
2013-02-28 17:42
There are many places around the house where a small light would be useful but running a mains cable to the location is impractical. Corners of dark cupboards, over the telephone to light… Read More
2013-02-28 17:39
The simple but very reliable monitor shown in Fig will be an asset to those who have difficulty finding their pulse in their wrist. It is also useful for checking the pulse rate immediate… Read More
2013-02-28 17:37
The circuit shown in Fig was devised as a cheap alternative to a moving coil meter when I wanted to monitor the output current of a power supply. Its operation is as follows: As the output… Read More
2013-02-28 17:34
If you, like so many other people in this day and age, arrive home from work stressed out and with the problems of the day still lingering,this simple little instrument will go a long way t… Read More
2013-02-28 17:30
This simple LED tester consists of a current source with a potentiometer that can be used to adjust the current. The current source is implemented using a type TL081 opamp. The output curr… Read More
2013-02-28 17:26
In this project we are going to extend the previous project to include a set of pedestrian lights and a pedestrian push button to request to cross the road. The Arduino will react when the… Read More
2013-02-28 17:21
We are now going to create a set of traffic lights that will change from green to red, via amber, and back again, after a set length of time using the 4-state system. This project could b… Read More
2006-06-07 11:16
C.H. VITHALANI This circuit protects refrigerators as well as other appliances from over and under-voltage. Operational amplifier IC LM324 (IC2) is used here as a comparator. IC LM32… Read More
2006-06-07 11:16
There are several types of voice recorder and playback systems available in the market but most of them are expensive and their circuits are also very complex to assemble. Here is a simple… Read More
2006-06-07 11:16
Keep away intruders with this compact electrified window charger. The charger produces non-lethal shocks that are strong enough to threaten intruders.The circuit uses IC CD4047 as a free-r… Read More
2006-06-07 11:16
Using this electrolytic capacitor tester you can detect leaky and dead (open) electrolytic capacitors. It operates based on the time constant (T) of the capacitor when it is charged up to… Read More
2006-06-07 11:16
Here is a circuit that helps you test cable continuity without requiring any physical contact with the bare cable. This circuit detects AC signal frequencies and gives an LED indica… Read More
2006-06-07 11:16
Amplifier CircuitThe circuit described here is of a Class-B audio amplifier based on operational amplifier TL082, transistors TIP41 and TIP42. LM833 is a dual operational amplifier wi… Read More
2006-06-07 11:16
Digital Thermometer generally used in wide variety of scientific and engineering applications, especially measurement systems.here we present a highly reliable digital thermometer which ca… Read More
2006-06-07 11:16
“ This article describes a simple UPS circuit that you can incorporate into the design of your own low power DC project to ensure continued operation during short term power fa… Read More
