On Thu, Mar 10, 2011 at 4:45 PM, Bento, Joseph (Electronic Communications Tech) wrote: > > -----Original Message----- > From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf = Of Olin Lathrop > Sent: Thursday, March 10, 2011 7:16 AM > To: Microcontroller discussion list - Public. > Subject: Re: [EE] Generating Nano-Scale AC voltages > > Yigit Turgut wrote: >> For some boring reasons, I need to have 10^-9 AC Volts (nV) on my >> desktop and I am seeking ideas for implementation. >> ... >> The circuit can run from any kind of source and frequency is can vary >> between 1-100 Hz. > > Look up something called a "resistor divider". =A0See attached. > > > While there is no problem with your circuit, I would advise caution if co= nnected directly to the line, observing polarity where the low side is conn= ected to neutral and the hot side connected to the 1meg resistor. =A0Ideall= y, perhaps, use a transformer and adjust the resistors accordingly. > > Joe Noise of that circuit is at 10^-3 mV scales already (: --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .