This is a collection in pictures. I'll add text later."Absolute Value Circuit Delivers High Bandwidth," Ron Mancini, EDN, July 2004.Analog Devices AD536 Absolute ValueA comparator-based peak detector using an LM339 open collector output.A comparator-based peak detector with NPN Boost transistors."Diode simulator reduces forward drop to 0.04V," Eng, EDN July 20, 1992."Frequency doubler gives pure sine wave," Electronic Design, June 21, 1975.The discontinued Precision Monolithics GAP-01 used as an absolute value rectifier.A two-color overload indicator using a comparator-based peak detector.
A peak flasher. Note the pinout error on the bottom TL074.
A log peak detector. Two channels shown. Crazynightowl may recognize this one.
The AD823 op amp used as a rectifier
AD823 rectifier output
D-R Compressor Shunt rectifier
An early dbx rms detector from the patent application.
A dbx rms detector using the CA3083.
Stephen Woodward, rms detector with differential input
dbx 902 rms using transistor array
bcarso symmetrical rectifier
Graeme symmetrical rectifier
Note: The above rectifier circuit has been attributed to SSL by Rod Elliot but I first saw it in the 1973 edition of "Applications of Operational Amplifiers," Jerald Graeme, Burrr Brown. It is used in the SSL Phase Meter.
Boss SG-1 Rectifier"Dual Polarity Peak Detector Operates From Single Supply," Chester Simpson, EDN, May 12, 1994
"Dual Polarity Peak Detector Operates From Single Supply," Chester Simpson, EDN, May 12, 1994.
Full pdf: http://www.waynekirkwood.com/images/pdf ... 2_1994.pdfFull Wave Precision Rectifier CW Beal Wireless World July 1982