App note: Offline non-isolated flyback converter protection

A white paper from Bourns about thermal protection PTCs on flyback converters. Link here (PDF) This paper examines the use of resettable polymer fuses for protecting offline flyback converters. Using a thermal model of the resettable fuse surrounding solder pads and copper to optimize the trip time so that the converter is protected during overloads, […]

Preview: Open source soldering iron driver v1.5

Today we sent our updated soldering iron driver v1.5 PCB to be fabricated. This is a 100% through-hole reroute of Arhi’s latest gen 3 design. The ground plane is broken into power supply, analog, and digital sections to help reduce noise. PCBs will be available in the free PCB drawer soon if you’d like to […]

Open source soldering iron driver update

Arhi has been busy debugging noise from PTC type soldering iron sensors. The problem was the sensor’s sensitivity to the current used as a bias. If the current used is greater or less then 1mA the sensor picks up too much noise. In the latest revision of the Soldering iron driver both PTC and TC […]