Sorry, AN521. John Remington wrote: >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 >> >> >> -- Note: To protect our network, attachments must be sent to attach@engineer.cotse.net . 1-520-777-7606 USA/Canada http://beam.to/azengineer -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist