Quoting John Coppens : > On Thu, 01 Nov 2018 17:11:16 -0400 > speff@interlog.com wrote: > >> Quoting John Coppens : >> >> >> The chip is made in China by Bright Power (Shanghai). >> >> https://i.imgur.com/PC2pGzD.png > > Hi sp. I really should get around to adding a signature on this webmail nonsense. > Thanks for the hint. I downloaded the datasheet (very minimal!) > The circuit is slightly different because of the extra lowpass. > > I suspect there is no second winding on the output coil, and > the 14k I measured is likely leakage current in the capacitor. > > This is the simplest switcher I ever came across. Even the fact > it gets it power directly from the 300+ Volt line is amazing. There are some in TO-92 package! The bulbs have to be made very cheaply. > > Again, much appreciated... And somewhat surprised and disappointed > Google didn't lead me to it. You're welcome. > BTW, an ad on the page at datasheetspdf.com, offered them in lots > of 25 at $0.1335/ea. > > John Judging by other similar products, I suspect the real domestic China price is a few cents in smallish quantity and more like a penny or two (negotiate= d and secret) in actual production volume. Domestic courier package =20 shipping is maybe Y8-10 ($1 or $1.50). --Spehro Pefhany --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .