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Tag: PCB layout

Cat Links Hacks, Personal Project

Rigol DS1054Z 12v Power Supply Noise Filtering

Posted on September 2, 2015September 2, 2015 The Engineer

Since I fitted my scope with a SMPS based 12v input supply, there has been a noise problem on very low volts/div settings, this noise isn’t present on the mains supply, so I can only think it’s coming from the switching frequencies of the various DC-DC modules I’ve used. Because

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Cat Links Personal Project

12v Temperature Controlled Soldering Iron

Posted on August 6, 2015 The Engineer

In my shack, 99% of my gear is all 12v powered, which is good for a few reasons: Single Power Supply – This increases efficiency, as I’m only getting the losses of a single supply. Safety – Mains voltages are dangerous, I’m not fond of working on such equipment. Portability

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Cat Links Ameteur Radio, Arduino, Hacks, Personal Project

Arduino Based SWR/PWR Meter – The Board

Posted on July 8, 2015February 25, 2017 The Engineer

I recently posted about a small analog SWR/Power meter I got from eBay, and figured it needed some improvement. After some web searching I located a project by ON7EQ, an Arduino sketch to read SWR & RF power from any SWR bridge. The Arduino code is on the original author’s

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Cat Links Personal Project, Randoms

Precision 10v & 5v Reference

Posted on May 2, 2015May 2, 2015 The Engineer

After watching a video over at Scullcom Hobby Electronics on YouTube, I figured I’d build one of these precision references to calibrate my multimeters. It’s based around a REF102P 10v precision reference & an INA105P precision unity gain differential amplifier. For full information, check out the video, I won’t go

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Cat Links Hacks, Personal Project, Randoms

Active Ultracapacitor Balancing

Posted on April 10, 2015January 3, 2021 The Engineer

Here’s another active balancing circuit for large ultracapacitor banks, this one is designed for a series string of 6, at 2.5v per capacitor. Based on the design here, I have transcribed the circuit into Eagle & designed a PCB layout. As can be seen from the circuit diagram above, this

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Cat Links Hacks, Personal Project, Randoms

Roving Networks RN-52 Bluetooth Audio

Posted on January 28, 2015January 29, 2015 The Engineer

I’ve been doing some tinkering with the RN-52 Bluetooth Audio module from Roving Networks, in prep for building a portable wireless speaker system, & thought I’d share my designs. Initially I was having some issues with RF noise on the audio output from the RN-52, as I was only using

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