Suppling power to MM

Maple Mini, Maple Rev3, Maple Rev 5 and Maple Ret 6, iTead Maple etc
racemaniac
Posts: 617
Joined: Sat Nov 07, 2015 9:09 am

Re: Suppling power to MM

Post by racemaniac » Mon May 08, 2017 6:18 pm

i just did a measurement on the maple mini of the voltagedrop of the ams1117, and it's indeed always >1V, even at lower current, so indeed a pretty crappy regulator if you want to run of lipo/lion

i've found similar regulators as ag123, and ordered
-some mcp1700's
-some XC6206's: 0.5A, 200mV drop @ 100mA
-some AP2112's, up to 0.6A, max 250mV drop :).

enough to last me a while, and should all 3 suffice for powering our lovely devices from a lithium battery :).

racemaniac
Posts: 617
Joined: Sat Nov 07, 2015 9:09 am

Re: Suppling power to MM

Post by racemaniac » Fri Oct 13, 2017 9:40 pm

Posting a little update to this topic: as i was ordering pcb's anyway, i made some small adapters for AMS1117 -> AP2112K. See the result below (yeah, crappy soldering, i know :p ).
mm-ap2112k.jpg
mm-ap2112k.jpg (67.75 KiB) Viewed 120 times
I like the results, the AP2112k has a quite low voltage drop. Not sure what my maple mini was running, but it was blinking its led, and drawing about 35mA, the voltage drop was about 0.1V, so down to 3.4V it kept fairly close to 3.3V (in practice it was about 3.275V), below 3.4V you start to really see the 3.3V getting lower. Using a regulator like that really makes it possible to run a maple mini directly from a 1S LIon battery :).

zmemw16
Posts: 1483
Joined: Wed Jul 08, 2015 2:09 pm
Location: St Annes, Lancs,UK

Re: Suppling power to MM

Post by zmemw16 » Sat Oct 14, 2017 1:57 am

aliexpress - only available in lots of 100, pricing £5.85 to £7.06 from 5 sources.

would this regulator be suitable for the 405/407 design ? <tongue-in-cheek>

stephen

racemaniac
Posts: 617
Joined: Sat Nov 07, 2015 9:09 am

Re: Suppling power to MM

Post by racemaniac » Sat Oct 14, 2017 5:45 am

zmemw16 wrote:
Sat Oct 14, 2017 1:57 am
aliexpress - only available in lots of 100, pricing £5.85 to £7.06 from 5 sources.

would this regulator be suitable for the 405/407 design ? <tongue-in-cheek>

stephen
that's what i'm currently using for my 405 design :). for the exact reasons i already posted here :).
For my saber boards i also switched to that one, seemed pretty much ideal for these kind of boards :). And hence i quickly made an adaptor so i could upgrade the various board i have with an AMS1117 to something proper (that AMS is way too popular :p).

zmemw16
Posts: 1483
Joined: Wed Jul 08, 2015 2:09 pm
Location: St Annes, Lancs,UK

Re: Suppling power to MM

Post by zmemw16 » Sat Oct 14, 2017 5:54 am

sorry i tend to only read the unread posts of threads.
srp

racemaniac
Posts: 617
Joined: Sat Nov 07, 2015 9:09 am

Re: Suppling power to MM

Post by racemaniac » Sat Oct 14, 2017 5:55 am

zmemw16 wrote:
Sat Oct 14, 2017 5:54 am
sorry i tend to only read the unread posts of threads.
srp
lol XD
no problem, i also don't always read everything or remember everything (even in my own threads :oops: ) :).
but it's indeed a nice regulator, and i've indeed got 100 of them laying around from aliexpress :).

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