Simple 555 Timer Based Time Sense Tester Circuit is fun and easy to make. It uses IC 555 and make time delay. Press one switch and start timer. Guess time presses second switch and it stop. LED show result and it is good for learning how brain feel time. Circuit uses 9V battery. Circuit Working: […]
Meters and Testers
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Sound Pressure Level Meter Circuit using IC CA3140
Sound Pressure Level Meter Circuit using IC CA3140 is device to check how loud sound is in one place. It shows sound level with visuals. It is useful for audio testing, noise check and sound work. This article shows simple way to make it using condenser mic, op-amp and FSD meter for correct sound measure. […]
Simple Christmas Series Lights Tester Circuit
Christmas come one time in a year and it brings big joy. Simple Christmas Series Lights Tester Circuit is simple design. It checks and fixes problem in series Christmas lights. These lights are used for holiday decorate. If one bulb stops then all lights go OFF. One bad bulb break the whole circuit and makes […]
Building a Simple Pulse Frequency Counter Circuit with Arduino
Pulse frequency counter count signal in hertz (Hz). It is an important tool in electronics. Now Arduino and other microcontroller make counter easy and cheap. This article for Simple Pulse Frequency Counter Circuit with Arduino show how to make this easy circuit with few parts. We have used IC 555 to make pulse, IC 7809 […]
Simple Op-amp IC Tester Circuit
Op-amps (operational amplifiers) are very important in electronics. They are used for filtering, amplify signals and analog signal work. Before using op-amp IC we must test it to ensure it works good and correct. To check op-amp fast and easy we have made a Simple Op-amp IC Tester Circuit Op-amp is like voltage comparator and […]
Digital Thermometer Circuit using Arduino and IC LM35
This project make digital thermometer using IC LM35 sensor and Arduino. Arduino reads voltage from LM35 and changes it to temperature number. People use thermometer for long time to check temperature. Temperature show on small LCD screen for easy see. With Arduino we can build thermometer that show real-time temperature on screen. It can be […]