Author Archives: V Subhash

Compile from source and install Apache HTTP Server 2.4 and PHP 7 on Linux

A how-to guide to build localhost (“virtual host”) PHP 7 sites on the latest Apache HTTP server I am using a nearly decade-old version of Ubuntu as my main OS. As it runs Gnome 2 and Firestarter, I will be … Continue reading

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Greasemonkey JavaScript-based YouTube adblocker and annoyances remover

Watching YouTube online is still impossible for me – the Net connection is still flaky and there are disturbances in the electricity supply. Downloading the videos and playing them offline is still the only option for me. Even then, the … Continue reading

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An easy “Joule Thief” inverter circuit to power an electric torch with two LEDs using only one 1.2 or 1.5 volt (dead) battery

These days, electric torches (flashlights) use LED bulbs. An LED bulb typically requires a minimum 1.85 volts to power on. Usually, a battery of two 1.5 volt cells (providing 3 volts) is used in torches to power them. If the … Continue reading

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Greasemonkey script to display newer comments on YouTube – bypass censorship

Changes comments filter to “Newest first” from “Top comments” YouTube has been raining on the parade of its content creators with demonetization, censorship and unexplained notifications disablement. Youtube comments are also being censored. The default filter is not “Newest first” … Continue reading

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Solution to OpenJDK’s “Connection error sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target” error

Today, I downloaded Open JDK 10 to test it against my NetCheck JAR file. It did not work. I got this error: Connection error sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target It … Continue reading

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A GreaseMonkey script to generate RSS feed links for YouTube channels

Many people use RSS feeds as the primary means to access news and information. RSS is anonymous and does not require you to log in. Though YouTube generates RSS feeds for its channels, it does not display them (to human … Continue reading

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Sound-activated LED lights using NPN transistor

What is wrong with the multi-colored LED light? Is it real? I have started experimenting with transistors. The amplified AC sound signal forked from the speaker (connected to the base) is enough to turn the transistor on.  The supply voltage … Continue reading

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