Active Crossover Circuit using IC LM324 important project for audio. It split audio signal into parts like low, mid and high. Each part go to right speaker with woofer for bass and tweeter for high. This make sound better and system works well. IC LM324 op-amp is used a lot. It is cheap, low power […]
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. […]
12 Watts Amplifier Circuit using Transistors
12 Watts Amplifier Circuit using Transistors make sound louder in audio systems and this 12W amplifier uses op-amp with NPN and PNP transistors. Thus, it gives strong output for 4 ohm speaker. Also, this circuit is good for audio lovers and boost weak sound to loud, which is clear and with good quality. Circuit Working: […]
Super Sensitive Intruder Alarm Circuit
This article for Super Sensitive Intruder Alarm Circuit talks about very simple but strong intruder alarm circuit. It is very sensitive. These circuit is good for security. They can catch very small intrusions. This circuit uses IC 741 op-amp and IC 555 timer to work. It also use LDR (light sensor) as main part so […]
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 […]
Understanding Photosensitive Devices Circuits
Photosensitive device works with light. When light hits the voltage or current changes. It can turn ON or OFF lamp, alarm or control system. They are used in auto lamp, sensors and safety circuits. Photocell: Photocell has special design. Light material is placed in zigzag between two metal contacts on ceramic base. Zigzag gives is […]