Hi Bill,So it may work with a simulator, I would not useit in a real world application.
I'm trying to do a sound level meter where i want to compute its rms with an analog circuit, i need to do the square of that signal. Also i looked up about that pulse height-width multiplier, it looks pretty hard to assemble. It's like an ic that i need to buy?If you are multiplying very low frequency or DC signals you can get amazing accuracy with a pulse height-width multiplier. One quadrant multipliers can easily work from a single 5V power supply.
What kind of signals do you intend to multiply?
Do you know any circuit configuration that can do a multiplication operation with a maximum supply voltage of 5V? It doesnt need to be super accurateThe circuit in the first post was copied from a book and it does look like an end of chapter homework problem.
And given the supply requirements and the potential variations in diodes with temperature, it does not seem that it would be useful in an application where the temperature would vary and the opamps were not perfect.
Hi Bill,And given the supply requirements and the potential variations in diodes with temperature, it does not seem that it would be useful in an application where the temperature would vary and the opamps were not perfect.
The idea was to me to develop an analog circuit, i didnt really wanna skip that and just buy one but i guess in my case i have really no other way because either its to complicated for me to build one or i just dont know how to do it.There are Chips to drive a Bar-or-Dot Array LED Meter,
they are available in Linear or VU-Meter versions,
does that sound like what You want ?
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An averaging circuit would just be a resistor and a capacitor?Another option is to use an averaging circuit instead of calculating true RMS. It will not be as accurate and it will not be true RMS, but depending on the application of the sound level measurement it might be good enough.
Or try the AD737 IC. And I suggest reading whatever application information is available for the AD737 on the AD site. I have found their information to be very useful on several occasions.
Yes, an averaging circuit could be that simple. There is a good deal of information about averaging circuits as opposed to TRUE RMS circuits. Consider that quite a few VU meters are damped just enough to show an average level. At least the ones intended for broadcast use in times past were.An averaging circuit would just be a resistor and a capacitor?
Can you tell me how to delete the post in the forum? pleaseHi Bill,
Please post your calculations that support your comments regarding your this poster's circuit's performance.
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