I'm creating a couple of audio projects (megaphones) that require different voltages for the power amp and other components. I plan to use rechargeable power tool batteries to power them.
As described on this page - https://endless-sphere.com/forums/viewtopic.php?t=83447 - the DeWalt batteries I plan to use have multiple terminals, for the purpose of load-balancing when charging and whatnot. Instead of using a regulator or a switching supply to change the nominal 20V output to 3.3 or 5V, it appears I could draw power from one of the extra terminals.
For the first project, I only intend to power a pre-amp that draws less than 1mA. I don't think this would be particularly problematic. Plus, it would only draw power while the power amp was and wouldn't suck power out of a single cell while the others stood by. It seems like this would be okay. What do you all think?
For the second project, I intend to use a Teensy 4.0. This draws a couple orders of magnitude more power and even if I incorporated a shutoff it would consume a more significant amount of power even when the power amp is silent. It seems like this might wreck the battery by taking too much from a single cell, but it would really simplify the design if I were able to simply pull clean low-voltage power from the battery.
Thoughts?
As described on this page - https://endless-sphere.com/forums/viewtopic.php?t=83447 - the DeWalt batteries I plan to use have multiple terminals, for the purpose of load-balancing when charging and whatnot. Instead of using a regulator or a switching supply to change the nominal 20V output to 3.3 or 5V, it appears I could draw power from one of the extra terminals.
For the first project, I only intend to power a pre-amp that draws less than 1mA. I don't think this would be particularly problematic. Plus, it would only draw power while the power amp was and wouldn't suck power out of a single cell while the others stood by. It seems like this would be okay. What do you all think?
For the second project, I intend to use a Teensy 4.0. This draws a couple orders of magnitude more power and even if I incorporated a shutoff it would consume a more significant amount of power even when the power amp is silent. It seems like this might wreck the battery by taking too much from a single cell, but it would really simplify the design if I were able to simply pull clean low-voltage power from the battery.
Thoughts?