Here’s a useful tool for testing both power supplies & batteries, a dummy load. This unit is rated up to 60W, at voltages from 1v to 25v, current from 200mA to 9.99A. This device requires a 12v DC power source separate from the load itself, to power the logic circuitry.
I recently came across a design for an Arduino controlled AD9850 DDS module, created by AD7C, so I figured I would release my Eagle CAD design for the PCB here. It is a mainly single-sided layout, only a few links on the top side are needed so this is easy
This is the teardown of a Zebra P330i plastic card printer, used for creating ID cards, membership cards, employee cards, etc. I got this as a faulty unit, which I will detail later on. This printer supports printing on plastic cards from 1-30mils thick, using dye sublimation & thermal transfer
This unit was bought from eBay to experiment with Magnetic Stripe cards, for little money. This unit is capable of reading & writing all 3 tracks, & both Hi-Co & Lo-Co card types. Interfaced to a PC through USB, this has a built in PL2303 USB-Serial IC & requires 3A
This is an old legacy wireless mouse from Logitech. This uses a ball rather than optical technology. Bottom of the mouse, showing the battery cover & the mouse ball. Top removed from the mouse, showing the PCB inside. The smaller PCB on the left supports the microswitches for the buttons
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