On Thu, Mar 10, 2011 at 1:27 PM, Sean Breheny wrote: > Just a warning that I would not put two Tantalums back to back as they > are much less tolerant of reverse voltage than Aluminum electrolytic > capacitors. > > I really think, VG, that you should be able to do what you want very > well with high-ish value ceramic capacitors (say 10uF) and a high > value resistor as a load, making the R*C product several seconds long. Advice taken. I went out today and bought a few 10uF and 100uF aluminum electrolytic bipolar caps at the local store. Very convenient. Price is ver= y reasonable. The time constant is interesting. Since the time constant has to a certain value for a certain frequency, is it better to have a high R and low C or high C and low R? --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .