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How to Design a High-Pass and Low Pass Filter Circuits Quickly

In this post we learn how to design audio filter circuits such as high pass filter and low pass filter circuits effortlessly without going through the hassles of complex simulation and calculations. The presented designs will enable creating filter circuits only for the desired specific frequency bands and block all other unwanted frequencies. What’s High … Read moreHow to Design a High-Pass and Low Pass Filter Circuits Quickly

Password Controlled AC Mains ON/OFF Switch

In this post we are going to construct a password based mains ON/OFF switch circuit, which can turn ON and OFF the AC mains supply, only when correct password is entered. This prevents the danger of electrocution of the technician who might be currently working with the high voltage lines and equipment. Password Protection for … Read morePassword Controlled AC Mains ON/OFF Switch

Mains High Low Voltage Protection Circuit with Delay Monitor

The post explains an upgraded version of my previous mains 220V/120V high-low voltage cut off protection circuit which now includes a delayed restoration of power for the load with 3 LED power status indicators. The idea was requested by one of the dedicated members of this website. Circuit Objectives and Requirements I just followed you’re … Read moreMains High Low Voltage Protection Circuit with Delay Monitor

Password Security Lock Circuit Using 4×4 Keypad and Arduino

In this post we are going to construct a password security lock circuit, which can be accessed by a 6-digit password. To be more precise it is alpha numeric password.   Hardware for this Project We are going to utilize 4×4 keypad, which consists of 0 to 9 decimal values, two special character ‘#’ and … Read morePassword Security Lock Circuit Using 4×4 Keypad and Arduino

Car Blown Brake Light Indicator Circuit to Detect Broken Bulb Filament Tail Light

The post explains a simple fused or blown car brake light indicator circuit using a single IC 555 and a few other passive components. The idea was requested by Mr. Joel Bayongasan Technical Specifications You innovations are great! Thanks for this blog. May I request something please? I was searching for a circuit that will … Read moreCar Blown Brake Light Indicator Circuit to Detect Broken Bulb Filament Tail Light