Fork of the BigClive AA trickle charger design: https://www.youtube.com/watch?v=wVnAH17f4jg
Raison d'etre (reason for existence): According to BigClive, the motivation is to have NiMH/NiCad batteries which are constantly topped off and ready to use. This resonates with me, because batteries do self-discharge over time if just left in a drawer after charging. This way, whenever I need a battery, I can simply pick it off this charger and know that it is fully charged and ready to use. I don't have to wonder whether it has self-discharged in a drawer and needs to be re-charged before using it. BigClive's big idea is that rather than storing your batteries in a drawer, you store them on his trickle charger so that they are fully charged and ready whenever you need a battery.
Advantages of this fork are:
Prior to BigClive's video I wasn't aware that trickle charging was even an option for NiMH or NiCad batteries. I don't know how advisable it is or isn't, or whether extended trickle charging may damage the batteries or not. What trickle charge current is advisable? I've seen one reference that suggests up to 0.05C is appropriate for trickle charging NiMH, but I can't vouch for that. Hence, I am posting this fork of the BigClive design for discussion purposes only. I do not know if constantly trickle charging NiMH/iCAD batteries will damage them. BigClive's youtube video seems to imply that trickle charging is safe and will not create a hazardous condition. However, I'm not an electrochemist, and I lack the knowledge to say for sure whether that is the case. For that reason, only try this project after first properly mounting it inside a suitable fireproof enclosure. Better safe than sorry.
I posted the complete KiCAD 6 archive for this project. It is the .rar file under this project's "Files" tab. That means I'm not a bottleneck. Anyone can open up the project and pick up exactly where I left off if they want to make changes or fork.
Inside the .rar file is a zip file. Don't unzip the .zip file. Rather, in Kicad 6, under the "File..." menu, go to "Unarchive project...." and give it the intact .zip file.
If anyone has experience with or knows anything about the advisability of NiMH/NiCAD trickle charging, please post in the comments section.
|Qty||Value||Device||Package||Parts||Description||MF||MPN||Aliexpress or Ebay link|
|24||Keystone AA through-hole battery holder/clip||Note: Inexpensive clones available on aliexpress.||Keystone||92||https://www.mouser.com/ProductDetail/Keystone-Electronics/92...|
|12||0805 Yellow LED's||0805|
|12||150||0805 150 Ohm Resistors||0805|
|1||USB-B connector||CUI Devices||UJ2-BH-2-TH||https://www.mouser.com/ProductDetail/490-UJ2-BH-2-TH|
|1||0805 Green LED||0805|
|1||330||0805 330 Ohm Resistor||0805|
|rev1||1 year ago||2||100 × 100|