## USB Null Power Supply

One time I read an Nuts and volts article where this guy took a usb cord and unhooked the +5v(red wire) and made it where the arduino can be powered by an external power supply without breaking anything.. This can be also handy for power hungry devices(such as external dvd burners,etc). This will draw nothing …

## When an soundcard probe uses wrong polarity on android/chromebooks

In this blog I will review the Virtins Soundcard probe using it on a chromebook. Chromebooks use a 4-pin headphone not a 3-pin connector like PCs and regular laptops use. Here comes the interesting part when measuring a sawtooth wave it was going backwords seen on figure 1 What can that do to the circuit? …

## Pythagorean Transistor Circuit

Here’s a circuit that Joerg from the electronics chat shared with me. The circuit outputs a current and inputs a current for the variables in the Pythagorean equation. Pythagorean theorem solves for the hypotenuse of a triangle. The currents in the circuit are the same way where C is the hypotenuse in amps I(A) is …

## Fake Flash Drive Tester

This script simply creates files onto the flashdrive to see if it is a real flash drive or fake. All files created by this script should all be the same. It works with all OSes that support PHP. NOTE THIS TOOL IS NOT MADE TO BE USED FROM A WEB SERVER. Batch file is included …

## Birthday Project 2022

Here is the birthday project of the year: TV Arduino Video Poker machine with real poker machine buttons.

## Simplest analog computer

In this post I will show you how to make a analog computer using just resistors, switches and a 100 micro ammeter. Here’s the schematic of it: You can see the idea on how this analog computer works, it uses ohms law to get current from resistors in the circuits. Each current is limited in …

## DIY TV Oscilloscope

Scopes are expensive and hard to find locally. Here we are going to build one out of a CRT TV. THIS METHOD ONLY WORKS WITH CRT TV, NOT PLASMA, FLAT SCREEN OR LCD TV. The circuit only uses the TV Deflection coils to create a magnetic field to attract the electron beam that the gun …

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