Can I rectify peaks in audio linear?

[electricaudio]

Hi!.

First post here,

great site!

I am hoping you can help me build a peak rectifier for audio signals of frequency around 1Khz.

So far, I came up across lots of them, but I want one with a distinctive characteristic:

Usually in a peak rectifier there is a capacitor with certain charging/discharging time.
The capacitor charges/discharges expontially in time.

I want a peak rectifier with a capacitor that charges linearly.

The rectifier I want shall also have a very rapid charging time constant (no more than 1ms) and a very slow discharging one (close to 50ms).

Anyone able to assist, probably with a schematic?

Thank you in advance for your opinions.

Ea.

 

[Russlk]

If the capacitor charges linearily, how do you know the peak has not already passed by the time the capacitor is charged? Normally, in a peak detector, the capacitor charges very fast and stops at the peak. What exactly are you trying to do?

 

[Nigel Goodwin]

To get a linear charge/discharge you need to provide a constant current to the capacitor, this would be difficult from the scheme you mention. Also the requirement for a linear charging seems a bit strange?, as Russlk says, what exactly are you trying to do?, and why do you think you need a linear charging curve?.

 

[audioguru]

This circuit might do the trick.
I copied and pasted from other stuff but haven't tried it.