There's nothing to be gained from this

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But I had to take a look

Assuming that a guitar creates a signal with voltage without batteries or power supply I wanted to take a look

Especially since I now have a BNC to phono jack cable hey let's take a look

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Now strum (one string only) a bit and try to grab a pic on the scope

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The messy "waveform" shown is only one of a myriad of varieties obtained in mere seconds 

I can only observe that what comes out of a guitar is much enriched with lots of components and artifacts vs a simple sin wave or something from a generator 

Each little harmonic or vibration is probably fighting for survival cancelling each other out and stuff 

I then remembered I had a frequency counter from when I was playing with some old CB radios so I thought ok let's see 440 but I didn't manage to get anything useful out of it

Maybe it would help to read the manual

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I played whack a mole with all buttons and settings and couldn't come up with anything

[Jazz P Bass]

Nice post!

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Alright well I had thought to try and filter the signal to clean it up and decided to try a series resonant circuit that would only allow 440 to travel through 

I knew I had some inductors laying around so I grabbed one that said 15 mH (praying this stands for milli and not micro)
Next I measured it and got 13.24 mH (again praying this is milli and not micro)

With that I cracked open an old book and started looking for the calculation which I found and inserted the value of 440 for f and 0.01324 for H then solved for C not having any idea what number I would come up with.

And I was quite floored with the result

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That's pretty crazy that I just need a 10 uf capacitor  so I'm damn lucky or damn WRONG

Oh well nothing better to do than hook it up and try

I went back and checked the math ➗


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So... preliminary results no bueno

I wanted to use an LED as a current indicator so I connected everything and started with a signal generator to see if the LED would come on when I hit the magic frequency

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Unfortunately I've got current for days
It's not selective at all

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I can go up to 200 khz and the stupid LED stays lit 

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I removed the LED and hooked up scope probes this circuit is not working
I can change the input frequency to whatever I want and the output shows the exact same thing

I checked the capacitor it checked out 9.66 uf and it's rated for 50v

Back to the ol I wonder what mH stands for



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Maybe time to insert micro Henrys into the equation solve for C and try that