Sallen Key Low Pass Filter, bandpass filter

[Maglatron]

So this question goes out to Bertus because it's his wonderful suggestion!!

Hello,

That is a very complicated detector.
A simple diode with a capacitor to ref might even do the trick.

Bertus

 

[bertus]

Hello,

Did you see post # 389?
I shows the effect of the RC timing.
100 nF and 1 megohm will have a full decay of about .5 sec.( 5 x rc time)

Bertus

 

[Maglatron]

Sorry, yes you did say, I forgotten about that

 

[Maglatron]

I dont think it's acting as it should!

 

[Maglatron]

red is before the diode and after the signal generator and green is between the cap and ground!

 

[bertus]

Hello,

What happens in the envelope?
What kind of diode do you use?
A shottky diode has a smaller voltage drop.

Bertus

 

[Maglatron]

Your first question, I don't know I don't see anywhere else to put the probe apart from after the diode and before the cap and resistor, which yields a flatline at zero volts, secondly just the standard one from the from the button at the top of the LTSpice program I'll put in a shottky now

 

[bertus]

Hello,

Can you post the .asc file from your simulation?
Also post the .wav file (rename the file to .txt before posting)

Bertus

 

[Maglatron]

before the diode and after the signal = red
after diode and before cap and resistor = green
after capacitor = turquoise
signal before diode (red) after cap (turquoise)

 

[Maglatron]

Any good? thanks for this btw!

 

[bertus]

Hello,

You used a resistor of 1 mili ohms in stead of 1 mega ohms.
Try the attached .asc and see what happens.

Bertus

 

[Maglatron]

oh I see thanks!

 

[Maglatron]

aaaaaaahhhh ok
so now I'm going to do 16000Hz and see if it's still does the enveloping effect!
Is that a good outcome ie is it good enough to use

 

[Maglatron]

ok 16000Hz is too high pitch going to go for 10000Hz

 

[Maglatron]

I'm having major trouble going 16 bands logarithmically from 45Hz to 6000hz any help??

 

[Maglatron]

I'm going to build two, one that have the 45Hz to 16kHz because I have the parts now, and one 45Hz to 6000Hz need to space correctly though normally I use chatgpt for the spacings but its just spitting out BS at the moment

 

[kellys_eye]

but its just spitting out BS at the moment

.......

 

[Maglatron]

?

.......

 

[Maglatron]

Hello, do you know how to get the spacings on a logarithmic scale from 45Hz to 6kHz please for 16 bands??
also I'm having a small problem of this

 

[Maglatron]

Does hz go on the x or y axis here? I'm pretty stuck does base 2 have anything to do with the scale?