I'm powering an ESP32 from the vcc pin and also a string of 177 RGBW Neopixels. Both are very voltage sensitive. In the Neopixel documentation it warns against anything over 6v, and I can confirm that they begin to malfunction past this threshold.
I'm having a lot of trouble finding a true 5v power supply. The sticking point is that the Neopixel string can theoretically pull 14amps, even though it never will. So I've had to beef up all the wire gauges and electrical components. I landed on ~10 a capacity with an 8a fuse as an acceptable solution.
The problem is that every single 5v power supply I've tried outputs 7.5v. Removing 2v wouldn't normally be an issue, except for the amps. I can't find a way to get rid of those 2v. I can put 5 10a Diodes in sequence and hope none of them fail. I can't use a regulator because of heat. Also if you add additional components to the circuit, it brings the voltage too close to the dropout and the regulator can output 4v.
I've tried direct supplies, regulated supplies and switching supplies. Here are 3 of the 5 I've tried. https://www.amazon.com/gp/product/B07H9XRZBP/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1 https://www.amazon.com/gp/product/B078RZBL8X/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1 https://www.amazon.com/gp/product/B08762BC1K/ref=ppx_yo_dt_b_asin_title_o04_s04?ie=UTF8&psc=1
Then I tried one of these. I put one of the "5v" 7.5v supplies on it. The threshold wasn't met and it output 0v. I attached a 12v supply to it (which is actually 17.5v) and it outputs.... 7.5v
I know that a more appropriate supply would be something like this But this form factor is not safe for my use-case.
Can anyone recommend an accurate supply that is fully enclosed and relatively portable?