With a linear regulator like this: In = Iout + Iadjust It is also Pin = Pout + Ploss but Ploss is a very large number, and it turns into heat Bob Ammerman RAm Systems ----- Original Message ----- From: "chucksea" To: Sent: Tuesday, September 16, 2003 6:39 PM Subject: Re: Mains connected linear voltage reg. > Does current out = current in or is it power out = power in - some loss???? > > > ----- Original Message ----- > From: "Olin Lathrop" > To: > Sent: Tuesday, September 16, 2003 4:29 PM > Subject: Re: Mains connected linear voltage reg. > > > > > Just come across some linear voltage regulators > > > from ST Microelectronics called VB408 and VB409. > > > They have a high input voltage range (400 and 580V), > > > so they can be connected directly to rectified 110 > > > or 220 V mains. They deliver a max of 40 or 80mA, so > > > could easily feed a simple PIC circuit. > > > > > > ... > > > > > > Now, anyone looked at these ? Or any similar mains > > > connected volt regulator ? Could be an alternative > > > to the usual "cap-voltage-divider" used in low power > > > mains connected microcontroller circuits maybe ? > > > > Note that 40mA from 400V is 16 watts. That's a lot of heat just to run a > > PIC off the power line. > > > > > > ***************************************************************** > > Embed Inc, embedded system specialists in Littleton Massachusetts > > (978) 742-9014, http://www.embedinc.com > > > > -- > > http://www.piclist.com hint: The PICList is archived three different > > ways. See http://www.piclist.com/#archives for details. > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.