David Lundquist

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David Lundquist

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  • 08.11.2011
  • Use op amps to make automatic-ORing power selector
  • Oldie but a great circuit. Just used this again in another design. Not sure if this the first time this has ever been put to print but I have used it a few times with great success. I must admit it is a little amusing reading through the comments by folks who seem to think this is comparator based design that does hard switching. I will add that I have used this a few times with TI TLV6001 op amps and they work great. The advantage is that this is a sub $.20 part. If you use the multi channel versions it gets even more economical. Dave