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quick fix for the regulator

A project log for LAMEBOY - another ESP12 handheld

fully portable ESP12 project with battery charging and power muxing

davedarko 09/12/2017 at 12:176 Comments

Since the AMS1117 regulator is not the best when it comes to the dropout voltage, I've made a little add on board, that will hopefully let me add the AP2112 regulator instead. They can be found on many adafruit boards, so I took that instead. I've ordered 12 boards, but the I'm still ashamed of what I "paid" and the board size :D

 

Discussions

K.C. Lee wrote 4 days ago point

FYI AMS1117 does not like ceramic caps as output bulk cap as the part was designed before MLCC so it is ill prepared for low ESR.  They goes into oscillation.  See scope picture in ast part in my build log.  https://hackaday.io/project/11427-low-cost-ntsc-gaming-with-arm-cortex-m/log/37823-pcb-layoutbuild

You can either use a small series resistor (1R) with the cap or use tantalum/electrolytic or use AP2112 which works with ceramic caps.

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davedarko wrote 4 days ago point

neat, didn't know that! 

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Arsenijs wrote 6 days ago point

Hey, that's a nice idea - I might make some of those myself! If lucky, I'll find a way to panelize it properly on a 10x10 panel of 0.8mm PCB, too =)

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Radomir Dopieralski wrote 09/12/2017 at 21:40 point

We need to run a square centimeter contest, to show those freedom units lovers!

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davedarko wrote 7 days ago point

my thoughts exactly! :D

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al1 wrote 4 days ago point

good idea

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