This is a simple temperature sensor circuit diagram using the LM335 temperature sensor and LM3914 IC. Here the complete temperature range becomes observable through an array of LEDs. The LM35 is an integrated circuit temperature sensor for sensing temperature on a degree Celsius scale. The LM3914 is an efficient display driver cum Milli volt … [Read more...] about Simple LM35 Electronic Temperature Sensor Indicator Circuit
Using Op-Amp
Zero Crossing Detector (ZCD) | Comparator Circuit Using 741 Op Amp
A zero-crossing detector(ZCD) is a voltage comparator that switches the output between +Vsat and –Vsat (Vsat: Saturation voltage almost equal to 14V) when the input crosses zero reference voltage. Then what is a comparator? In simple words, comparators are basic operational amplifier circuits that compare two voltages simultaneously and switch the output … [Read more...] about Zero Crossing Detector (ZCD) | Comparator Circuit Using 741 Op Amp
Summing Amplifier | Inverting Adder Circuit Using Op Amp 741
A summing amplifier or an adder is used to sum two signal voltages. A voltage adder circuit is a simple circuit that enables you to add several signals together. It has a wide variety of applications in electronic circuits. For example, on a precision amplifier, you may need to add a small voltage to cancel the offset error of the op-amp itself. An audio mixer is another good … [Read more...] about Summing Amplifier | Inverting Adder Circuit Using Op Amp 741
Simple Portable Audio Power Amplifier Circuit Using lm386 IC
Here circuitsgallery comes with the simplest mini audio amplifier circuit schematic using LM386 low voltage audio power amplifier IC. This circuit is applicable to power medium-sized speakers from a music player that can only drive earphones (lm386 headphone). The LM386 is a low voltage power amplifier IC designed for use in low voltage … [Read more...] about Simple Portable Audio Power Amplifier Circuit Using lm386 IC
Mobile Sniffer or Mobile Phone Detector Circuit | Engineering and Diploma Project
Here is a simple engineering project circuit of a handy mobile phone detector circuit (sniffer). The pocket-size mobile communication detector or sniffer can sense the existence of mobile. So you can use it to avoid the use of mobile phones in private rooms, examination halls, etc. The circuit can detect incoming and outgoing calls, SMS, MMS, GPRS … [Read more...] about Mobile Sniffer or Mobile Phone Detector Circuit | Engineering and Diploma Project
