The rear has the specifications, laser-marked into the plastic. The serial numbers are just sticky labels though, and will come off easily with use. This is the Contec CMS-50F wrist-mounted pulse oximeter unit, which has the capability to record data continuously to onboard memory, to be read out at a
I’ve been working on something new for the blog, as I have a massive collection of scrap ICs – that is to decap the silicon & get them under a microscope! Here’s the first image, a Texas Instruments part. This has been stitched together from 140 separate images to create
While searching around for regulators to convert my new scope to 12v power, I remembered I had some DC-DC modules from Texas Instruments that I’d got a while ago. Luckily a couple of these are inverting controllers, that will go down to -15v DC at 15W/3A capacity. I’ve had to
To provide more run time with the conversion to petrol & spark ignition, I have also upgraded the on-board electronics supply to compensate for the extra ~650mA draw of the ignition module. This modification is centred around a 3S Lithium-Polymer battery pack, providing a nominal 11.1v to a voltage regulator,
Here I will document progress in replacing standard halogen MR10 lights with LEDs. These units are from TruOpto, available through Rapid Electronics in the UK. They are 3W total, from 3x 1W emitters on an aluminium back plate. Here is the LED attached to a heatsink for testing purposes –
To help make my system more efficient, a pair of switching regulators has been fitted, the one shown above is a Texas Instruments PTN78060 switchmode regulator module, which provides a 7.5v rail from the main 12v battery pack. A Lot like the LM317 & similar linear regulators, these modules require
This is an old USB 1.1 hub that was recently retired from service on some servers. Top of the unit visible here. Bottom label shows that this is a model F5U021 hub, a rather old unit. PCB is here removed from the casing, Indicator LEDs along the bottom edge of
This is a device designed to reset Epson brand ink cartridges that are reportedly out of ink, so they again report full to the printer Here is the front of the unit, with the guide for attaching to a cartridge. Back of the device removed. 3 button cells provide power
This is a HP PhotoSmart 375 portable photo printer. With built in card reader, screen & PictBridge. Top of the printer showing the UI Buttons & Screen. Front of the unit, card reader slots at the top, Pictbridge USB connector at top left. Paper out slot at bottom. Cartridge door