active low pass filter

redepoch7 · Mar 16, 2010

I'm still trying my hand at bending this silly keyboard.

I am trying to add some custom analog effects. I found a schematic on a circuit simulator and tried modifying it to fit my needs.

I used a TL082 with the schematic below... It didn't do anything except make it quieter.

Is this even in the right direction???

**broken link removed**

Any help would be AWESOME!!!

MikeMl · Mar 16, 2010

The capacitors are 100 nano Farads?

redepoch7 · Mar 16, 2010

they are 100uF

microfarads... right???

MikeMl · Mar 16, 2010

Well, no wonder it just made the signal quieter! Here is the frequency response as a function of the Pot value of 1, 100, 1000, and 10K using 100nF capacitors.

redepoch7 · Mar 17, 2010

sorry, I'm a new to this...

So are you saying that I should try something like a 100nF?

I assume that the different colors correspond to the different pots?

Which is red and which is teal and which is better? Is it better to have a steeper tangent or...???

redepoch7 · Mar 17, 2010

also, do I need to amplify it if I do???

MikeMl · Mar 17, 2010

Red is 1Ω, Blue is 100Ω, Green is 1000Ω, and Teal is 10K.

If this goes in the line input to the audio speaker amp, then you shouldn't have to amplify it.

This is just a low-pass filter, so it it will cut the treble, leave the bass, much more than a tone-control would do. It will make the sound tubby. What were you expecting it to do?

redepoch7 · Mar 17, 2010

Thank for the color key.

I don't have any preexisting criteria for what it should sound like. I'm just trying to create some effects that I could add onto a cheap toy keyboard. I am trying to learn about electronics and that seemed like a good way to maintain my interest while also giving me some clear cut examples where I could see (or rather hear) the results.

I'm not too sure what tubby will sound like but I'm stoked to hear it.

I really appreciate your help. This is great.

Any other suggestion you want to add, please feel free!

Thanks again!
n

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active low pass filter

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