Building the power conditioning module for the particulate sensor is the subject of this log. The components in this module include all of the MOSFETS, transistors, diode, and the DC-DC boost converter. An overview of the modules was described in From Breadboard to Enclosure - Part 1
The components are shown below. The full schematic is here: schematic.
A soldered protoboard will be used for construction. For protoboard, I either use Adafruit Perma-Proto (left in photo below) or a generic stripboard (right in photo), cut to a custom size.
The Adafruit product is high quality - the through holes are accurately drilled and plated. The stripboad is somewhat lower quality - no though hole plating and inconsistent drilling which can lead to track lifting if there is any rework. The photo below shows some of the off-center drill holes on the stripboard.
However, compared to a Perma-Proto board a stripboard module can be designed with a denser component layout, leading to a smaller module. In the end, the need for a small module size led to the selection of stripboard.
Related stripboard idea: There is high quality stripboard that is available, but it comes a significant price premium. I think it might be possible to design a stripboard in KiCad and then have it built by a custom PCB manufacturer. I am seeing low-cost PCB manufacturers offering 3 PCBs (10cm x 10cm) for USD $10 + shipping. These PCBs would have plated through holes and solder resist between the holes, and hopefully accurate hole placement. I might explore this avenue and document the results in a Hackaday project.
The completed power conditioning module is shown below. I am using polarized JST connectors for connection to the particulate sensor and cpu module.
The upcoming Part 3 will detail the construction of the stripboard that contains the Spec Sensor modules.