A Temperature Difference Based Relay Switch Circuit compares the temperature of two different points and then switches a relay when the temperature difference reaches a set value. This circuit is useful in solar water heaters, cooling fans, battery temperature monitoring, incubators and industrial heat control systems. In this circuit, the LM741 operational amplifier works as […]
Sensors and Detectors
Op-Amp Based Diode Temperature Sensor Circuit
Temperature sensing is very important in electronic systems because many devices use temperature sensors to check heat and protect the circuit from damage. In this Op-Amp Based Diode Temperature Sensor Circuit, we used a simple 1N4148 diode as the sensing part and IC 741 as the signal processing unit. The circuit gives output voltage which […]
IC 741 Based Audible Light Sensor Circuit using LDR
The IC 741 Based Audible Light Sensor Circuit using LDR is a simple and useful electronic circuit which detects the change in light intensity and gives an audible sound through the speaker. Also, this circuit works like a light controlled pulse oscillator generator, as IC 741 gives pulse signals at the output and the speaker […]
Simple LDR Based Light Detector Circuit using Timer 555 IC
Nowadays, light detector circuits are very useful in many small electronic projects, For example, we use them in automatic lamps, security alarms, and light sensing devices. In this Simple LDR Based Light Detector Circuit using Timer 555 IC, the IC works as the main control unit, along with that, the CDS photocell, also called LDR […]
Automatic Light Sensor Buzzer Circuit using Transistors
A Automatic Light Sensor Buzzer Circuit using Transistors is a simple electronic project which gives alarm sound when light level changes. In this circuit, an LDR (Light Dependent Resistor) senses the surrounding light, and when the room becomes dark, the resistance of LDR increases and because of this, transistor stages switch ON one by one […]
Temperature Sensing Alarm Circuit using Buzzer
We already see many temperature detector circuits in out previous blogs, but in this project we show a simple temperature detector circuit, here we use LM335 temperature sensor as good sensor IC and TL071 op-amp IC as comparator. Now, the circuit senses temperature and then gives alert using buzzer when temperature crosses set level, so […]