are you talking about the 110vac to 5vac transformer eliminator? or the wheatstone bridge adc? you gave two different numbers, 51 and 251, I think the the transformer eliminator is TB008 or something. On 10/28/05, Bob Axtell wrote: > > I can't drop this, it is too important. I have never seen an > app note like this- sans safety warnings- anywhere else > in the industry. > > What we experienced designers are concerned about is > that AN51- if followed exactly- has the potential to cause > a product to be created that might hurt someone. > > People look to MicroChip, a world leader, to provide guidance. > Since the word "APPLICATION" is used in the title, people > without much engineering knowledge will assume that what > is said here is safe, 'cause a world leader said so. I would > not be very concerned if this note come from a user, but > coming from an actual _MicroChip_ _employee_, > it opens MicroChip up to a needless lawsuit if the note > is followed without serious revision. > > Microchip should: > > 1. State a clear warning to the reader that the circuit should be > isolated with an isolation transformer before working with any design > powered straight from the power line. > > 2. Indicate that the limiting resistor should be constructed so that > it will handle AC line transients. What is most damning is that > the contrary is indicated by the app note...!! > > 3. Indicate that the PCB layouts must be carefully done to prevent > a creepage path that might harm a user. > > OR > > Remove AN251 and all references to it from its catalog. > > --Bob > > -- > Note: To protect our network, > attachments must be sent to > attach@engineer.cotse.net . > 1-520-777-7606 USA/Canada > http://beam.to/azengieer > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist