FYI: This <https://katalog.we-online.com/pbs/datasheet/74488540250.pdf>was 
the transformer I was using. The saturation current is 0.7A.

On Thursday, May 2, 2019 at 2:54:25 PM UTC-4, gregebert wrote:
>
> Sounds like your transformer is saturating; common problem with small 
> magnetics.
>
> I used an LPR6235-123 from Coilcraft in my wristwatch. They sell to 
> end-users in small quantities, which is nice.
> Even though it only ran for 7 seconds at a time, it still overheated at 
> 7mA load but it's a possible option for you at 2mA.
>

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