Prying open a dashcam GPS antenna

After having torn down and subsequently successfully reassembled two Aukey dashcams, the DRA1 and (more recently) DRA5, I had two options for what to do with them: donate them or keep them (I guess I could also “sell them”, but that’d really stretch the meaning of “open box”, wouldn’t it?). So far, I’ve kept them. … Read more

Building a personal workstation: picking up the pieces

Assuming you’ve already read last month’s tale of woe (if not, I highly recommend a perusal of it, as well as the two preparatory pieces that preceded it, before continuing), you already know that my gamble on an “open box” AMD high-end desktop PC microprocessor—one that ended up actually being not only “used” but “used … Read more

Disassembling a wireless charger with a magnetic personality

With every iPhone generation, with varying degrees of success, Apple strives to come up with at least one “killer” new feature that will motivate not only potential Android switchers but also iOS upgraders. For the iPhone 12, there were (at least) two: first-time 5G connectivity, and the underlying motivation for this particular teardown, MagSafe. Long-time … Read more

CMOS flip-flop used “off label” implements precision capacitance sensor

When applied to pharmaceuticals, the term “off-label” suggests the (frequently discovered) practical and beneficial uses for a drug that are different from the one it was originally developed for. This happens for electronic components too, such as the venerable CD4013B dual-D CMOS flip-flop.  Despite the 4013’s labeling as a traditional bi-stable logic element, it nevertheless … Read more

CMOS flip-flop used “off label” implements precision capacitance sensor

When applied to pharmaceuticals, the term “off-label” suggests the (frequently discovered) practical and beneficial uses for a drug that are different from the one it was originally developed for. This happens for electronic components too, such as the venerable CD4013B dual-D CMOS flip-flop.  Despite the 4013’s labeling as a traditional bi-stable logic element, it nevertheless … Read more

CMOS flip-flop used “off label” implements precision capacitance sensor

When applied to pharmaceuticals, the term “off-label” suggests the (frequently discovered) practical and beneficial uses for a drug that are different from the one it was originally developed for. This happens for electronic components too, such as the venerable CD4013B dual-D CMOS flip-flop.  Despite the 4013’s labeling as a traditional bi-stable logic element, it nevertheless … Read more

Adjustable triangle/sawtooth wave generator using 555 timer

The circuit works due to the fact that voltage increases or decreases linearly when a constant current flows into or out of a capacitor. If we manage to charge and discharge the capacitor with the same constant current, then the voltage of the capacitor will become a triangular wave; that’s the crux of this circuit … Read more