98% efficient 4 watt 12V DC-DC converter EE13/7/3 N87 ferrite

Hmm, perhaps. If it's starting to saturate at 15V, though, I'd expect it to pretty well quit entirely by 18V.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs 
Principal Consultant 
ElectroOptical Innovations LLC 
Optics, Electro-optics, Photonics, Analog Electronics 

160 North State Road #203 
Briarcliff Manor NY 10510 

hobbs at electrooptical dot net 
http://electrooptical.net
Reply to
Phil Hobbs
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I found that my power supply's current meter is inaccurate, and reads about

0.03A low. So I have updated the figures above. Obviously, my other power readings were similarly skewed. Note to self: always check calibration of instruments!

Thanks,

Paul

Reply to
P E Schoen

I found my power supply meter reads about 0.03A low, so revised figure is

87%. Still not bad.

Thanks,

Paul

Reply to
P E Schoen

Dave Jones showed a multimeter which indicates -5A when only a lead carrying a 1 MHz square wave is connected to the +A input or even when held near to the case... and it wasn't a cheap meter.

Reply to
Rob

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