I wrote a few weeks ago about replacing the hot water circulating pump on the boat with a new one, and mentioned that we’d been through several pumps over the years. After every replacement, autopsy of the pump has revealed the failure mode: the first pump failed due to old
Description and Schematic SG-HM2 is a modular He-Ne laser power supply based on IC-HI1 with some minor enhancements. The first version is for laser tubes up to approximately 1 mW (2 mW with trivial modifications) but it should be straightforward to go to 5 mW or even higher power tubes
For a while I’ve wondered how these pancake type (AKA “Shaftless”) vibration motors operate, so I figured I’d mutilate one to find out. These vibrators are found in all kinds of mobile devices as a haptic feedback device, unlike older versions, which were just micro-sized DC motors with an offset
Everyone at some stage must have seen these EAS security tags in shops, usually attached to clothing with a steel pin. As some of this year’s presents had been left with the tags attached, I had to forcibly remove them before wrapping could commence. These are just a plastic disc
Here’s a rather unique device for protecting safes & vaults from attack by thefts. It’s an Aritech VV602 seismic detector, based on piezoelectric sensors. Not surprisingly, this unit is covered in tamper sensors as well. There are several different sensor types in use: Piezoelectric vibration sensing Thermal sensing Magnetic sensing
An old IDE interface Zip drive. This fits in a standard 3.5″ bay. Top cover removed from the drive, IDE & power interfaces at the top, in centre is the eject solenoid assembly & the head assembly. Bottom is the spindle drive motor. Head assembly with the top magnet removed.
Here is a cheap no frills microwave oven, which died after a few weeks of normal use. Cover removed, showing the internals. Front of the microwave is on the left. Closeup of the timer unit. Cheap & nasty. Magnetron removed from the oven. Antenna is on the top, cooling fins
This is the hydraulic system from an Audi TT that would power the soft top. Here is the hydraulic pump unit. Oil Tank is on the left. Power is 12v DC at ~20A The pair of hydraulic cylinders that attached to the roof mechanism. One of the cylinders has a
Here is an old fish tank external filter & a few pics of the insides. Label on the front of the pump head. Fittings on either side of the motor are water I/O. Underside of the pump head, inlet is on the right, outlet from the pump is on the
This is a Western Digital drive recently removed from my laptop when it died of a severe head crash. Top of drive can be seen here. Here the cover has been removed from the drive, showing the platter, head arm & magnet. Yellow piece top left is head parking ramp.