This peak detector has a memory to prolong the response. The circuit is from American documentation from the 1980s. The supply does not have to be symmetrical.
This circuit was obtained from a Linear Technology manual from the 1990s. The sensor is of the...
This circuit for VCR recording heads was found in the February 1990 issue of Radio Electronics magazine....
The integrated circuit used in this project is not common today. It was found in a 2000...