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Introduction There are lots of spectroscope designs on the web but most involve dissecting a CD or DVD to get a transmission grating. I wanted to build one into which one could just drop a standard DVD and get it to work. I also wanted…
The earlier marks of the AVO 8 analogue multimeter use a 15 V B121 / BLR121 battery for their high resistance range. This battery has been obsolete for decades, although commercially available substitutes exist which are based on a stack…
This bracket will accept a 3757 toothbrush charger for Oral-B toothbrushes and the like. It allows you to charge / store the toothbrush obliquely. It's got two-point contact and a large, flat base so is really quite stable too. The…
This is a very simple chassis to support a QRP Labs QCX-PA2 power amplifier. If you build the amplifier kit without an enclosure, the large heat-sinks are joined to the PCB only via the tabs of the power transistors, so everything can…
After a big aurora display in May 2024, easily visible from my light-polluted suburban location, I decided I wanted to implement an all-sky camera. A very popular implementation is that originally written by Thomas Jacquin…
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