[SOLVED] Can any circuit solve this problem?

[psurya1994]

Is there any way in which I can build a circuit (or a already existing ic) which takes input a variable voltage (for example a clock) and outputs a dc voltage(average)?
I got this doubt when I was trying to make a LED on a breadboard toggle using a TV remote. I used a TSOP receiver to detect if the key on the remote is pressed. Is there any better way in which i can achieve this?

 

[mister_rf]

You may use a peak detector = series connection of a diode and a capacitor outputting a DC voltage equal to the peak value of the applied AC signal. The peak detector is the same as a half-wave rectifier with a filter capacitor added to the output. For low input signals the peak detector may be combined with additional amplifiers in order for the input pulse to exceed diode threshold voltage. A more complex circuit use operational amplifiers e.g.
http://www.discovercircuits.com/DJ-Circuits/peakdet1.htm

http://www.imagineeringezine.com/ttaoc/r-circuits.html

 

[DFW Z33]

Will a peak detector output the true average? I thought the only reliable way to do this was with an op-amp? (I do not know, Im just curious)

 

[BradtheRad]

A filter capacitor is often used to do a similar job in power supplies.

Component values must be chosen to suit the lowest anticipated frequency.

Ordinarily I might draw a static schematic and post the image...

However this animated simulation should be more fun to watch (click OK to load the applet). Change values by right-clicking a component, and selecting from the menu (or on a Mac, press Control and click).

https://www.falstad.com/circuit/#$+...+0.025+0+-1 o+4+64+0+34+5.0+9.765625E-5+1+-1