In another thread I found a link to a precision full rectifier using single supply opamps with out needing any diodes.
http://www.edn.com/contents/images/6250014.pdf
As noted in the article, the circuit relies on having an op-amp that doesn't latch up when the input goes negative, dropping below the ground rail.
Those op-amps are $3-$4 in single quantities, are there any other op-amps to choose from that are protected from phase inversion?
I am using this circuit to rectify a line level audio signal, with the rectified signal being sampled by an ADC to eventually result in a VU meter type display.
thanks for any suggestions,
--steve
http://www.edn.com/contents/images/6250014.pdf
As noted in the article, the circuit relies on having an op-amp that doesn't latch up when the input goes negative, dropping below the ground rail.
Those op-amps are $3-$4 in single quantities, are there any other op-amps to choose from that are protected from phase inversion?
I am using this circuit to rectify a line level audio signal, with the rectified signal being sampled by an ADC to eventually result in a VU meter type display.
thanks for any suggestions,
--steve