For the longest time I never had a proper variable bench power supply. One reason being they seemed very expensive for what they do, or at least for what I needed. There are the questionable Chinese ones in the $100 range which have adequate specs if you’re willing to take the risk, or you can… Read more »
Every so often a more mechanical than electrical device finds its way into my work area. A local machine shop had a pair of Makita GA-5020 angle grinders that had been used and abused and needed some work. One didn’t work and the other had some vibration issue. I found a nice exploded parts diagram… Read more »
A customer came to me wanting a custom sub box to fit into the back of his old Chevy Blazer. He had three Alpine SWR-10D2 subwoofers and and an Alpine MRX-M240 mono amp which is spec’d to output 2400W into 2 ohms. Finding Maximum Power Per Driver One of the first steps is calculating the… Read more »
When it comes to speaker design, the lowest frequency driver determines the volume and therefore overall size of the enclosure. The required volume is determined by the mechanical and electrical characteristics of the driver and whether or not the enclosure is ported or sealed. A tool I like to assist me for designing enclosures is… Read more »
It is often useful to be able to test amplifiers or power supplies to see how they perform under their rated specs. This is often a challenge due to the excess amount of heat generated during these tests. One of the simplest and cheapest ways to create a dummy load would be to buy an… Read more »
A customer brought me an iPhone 5c (A1532) which was not taking a charge and would not turn on. The most common failure point is a bad charge port on the iPhone, but testing it with a new one resulted in absolutely no current getting into the phone. Replacing the battery with a charged on… Read more »