In this video we look at the Facit NTK Mechanical Calculator from 1957! In this video we answer some questions from the last Facit NTK Mechanical Calculator video. I explain how the decimal place markers work and what happens when you divide by zero! Further information John Wolff’s excellent website User manual (PDF) I refer […]
In this video we look at a dirt cheap wireless energy meter that is surprisingly accurate. We put it through its paces before tearing it down to see how it works. Further information Altronics product page Atmel AT24C02 datasheet (PDF) Cirrus Logic CS5460 datasheet (PDF)
In this video I review and teardown the Turnigy Infrared Thermometer, which is a rebadged ZyTemp TN105i2 Compact IR Thermometer. This is a great piece of kit for any electronics workshop! Further information ZyTemp (manufacturer) page Instruction manual (PDF) HobbyKing (distributor) page
In this video I review and teardown a cheap Motion Activated PIR Solar LED Light from Amazon. The product is described as a: Swiftly Done Bright Solar Power Outdoor LED Light Further information Amazon product page
In this video we learn about the Hall effect. This is a quick history and explanation to help you understand some brief theory and how it works.
In this video we take another look at the RS-232 plug-in module for the Sanden PET-07 CC/CV power supply. In particular, we see how the voltage output can be controlled and how this clears up some ambiguity with the circuit design. In part three, we will *finally* attempt to communicate using RS-232 to monitor and […]
In this video we take a look at the Sanden PET-07 CC/CV power supply. In particular we look at the RS-232 plug-in module and attempt to make sense of the signals between the main board and plug-in board. In part two, we’ll apply this knowledge to attempt to receive RS-232 data from the power supply. […]
When I first began using the Raspberry Pi to run Java applications, Oracle had yet to release a Java virtual machine that utilised ARM hard floats (hardware accelerated floating-point math processing). This meant that the Oracle JVM had to do all of this arithmetic in software causing excessive CPU load and poor performance. It was […]
Sometimes it’s necessary to leave a publicly accessible SSH connection available on your Raspberry Pi. While a strong password is essential, a much more secure method for authentication is to use a public and private key system. This guide will take you through all of the steps to creating the keys, configuring the Raspberry Pi, […]
Here is the design and build of my compact DIY electronics workbench. This is located in the garage / workshop in a house that I’m renting, so I’m building it to be portable and transportable in future. In this forth episode I complete the hutch shelving, mount some component trays, and more!