Archive for the ‘Electronics’ Category

Video of the day

I love these highly risky rescue operations ! They remind some blood icing situations and the immense joy of saving a bunch of critical bytes of data or restarting a critical equipment just in time. Any story to share here ?

3D Printing (Part 14)

Part 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 The heating plate is made of two symmetric printed conductive layers ~1.5 Ohm each. As printed on the heating plate you may wire them for use with 12 V or 24 V power supplies. As we need to add an extra power supply the choice for a 24 V power supply is […]

TASCAM Sound Recorder (Part 4)

Part 1, 2, 3, 4 And here is the driver code. Nothing exceptional just plain good’ol arduino code. Check the writeByte function which contains few tricks and optimizations that are mandatory to achieve a proper timing. Ultimately this code contains a pretty versatile bit-bang UART writer that you may want to reuse in various applications. Enter […]

TASCAM Sound Recorder (Part 2)

Part 1, 2, 3, 4 And here it comes! Packed in a cardbox box which contains: 1 Tascam DR-40 recorder wrapped in plastic bag 1 mini USB cable 1 user Manual printed in various languages 3 alkaline batteries 1 small rubber stand in a small plastic bag! Watch out, this small rubber stand is a […]

PCBs (Part 2)

Part 1, 2, 3, 4 Let’s exercise the tip and tricks that I shared with you in my latest post. Here are the requirements for this subject: Project: As a one idea per minute person, it was hard for me to stick to one project and one design. However, I had in mind the project […]

PCBs (Part 1)

Part 1, 2, 3, 4 PCB design pitfalls… A quick glance on the net brought me to various interesting web sites: “4 Circuit Board Design Mistakes to Avoid” “PCB Design – The Top 5 Mistakes” “6 PCB Design Mistakes to avoid designing printed circuit boards” “7 Fatal Mistakes to Avoid on Your PCB Design” “Top […]

Current generators (Part 1)

Part 1 Here starts a new series of post dedicated to current generators. As usual, the idea is to describe working experimental prototypes that feature few components and quite good performances. Current generators can be found in various applications such as battery chargers (advanced ones, aka multiple stages or intelligent battery chargers), LED drivers and […]

Particle sensors (Part 1)

Part 1 I am amazed by the massive improvements of sensors along the last 10 years. Not so long ago, some sensors would fit in a shoe box and require 24 VDC, not to talk about the interfaces, weight, etc. These improvements are mainly due to the incorporation of advanced sensors in smart phones: camera, […]

Metal detector (Part 1)

“Dear cousin, I lost my keys in the middle of the meadows, would you please make a metal detector for me ? Urgent !“ This is really how this project started ! More or less, as I have in mind the design of an Earth’s Field Nuclear Magnetic Resonance spectrometer which features magnetic fields sensors on […]

Switch Mode Power Supplies (Part 3)

Part 1, 2, 3 Current sensing. This part is probably the most critical and most uneasy. It is critical because current sensing will protect both the power supply and the driven load from excessive currents and thus excessive amounts of energy dissipated in both the source and the receiver. There are multiple designs available for […]