Nowadays, many hobby electronics users like to build interesting sensor projects and an EMF Ghost Detector is one such simple and exciting project. This EMF Ghost Detector Circuit using Arduino Uno and LCD Display detects electromagnetic field changes around electrical devices, wires and nearby electronic signals. Also, many people use this type of circuit for […]
Sensors and Detectors
PIR Sensor Based PNP Switching Circuit for Output Control
In this tutorial, circuit uses a PIR sensor to control an output load through transistor switching, but the main purpose of this circuit is to turn ON the output when motion is detected and when PIR sensor detects motion, it gives a trigger signal After that, the NPN transistor and PNP transistor work together as […]
Simple LDR Based Refrigerator Door Warning Circuit
In our previous post, we designed a Refrigerator Door Open Alarm Circuit with IC 555 but however, in this post, we design a Simple LDR Based Refrigerator Door Warning Circuit without using any IC. Moreover, this circuit helps to alert the user when the fridge door stays open for a long time, as this simple […]
Dual Threshold Voltage Comparator Circuit using IC LM741
A dual limit comparator is an important electronic circuit which compares one input voltage with two fixed voltage levels. In simple words, this Dual Threshold Voltage Comparator Circuit using IC LM741 checks whether the input voltage stays within a fixed range and it also checks whether the voltage crosses the upper limit or the lower […]
Current to Voltage Converter Circuit using Op-Amp
This simple Current to Voltage Converter Circuit using Op-Amp helps convert small input current into easy measurable voltage output. This circuit is very useful to measure current from sensors like photodiodes, LDR modules and other low current devices, the main work of this circuit is to change input current into proportional voltage, so we can […]
LDR Based Morning Alarm Circuit using NAND Gate IC
A LDR Based Morning Alarm Circuit using NAND Gate IC helps switch on an alarm sound automatically when morning sunlight falls on the sensor. This circuit uses an LDR (Light Dependent Resistor) and a CD4011 NAND gate IC to detect light and as soon as sunlight reaches the LDR, the resistance of the LDR changes. […]