Will this switch work as a treble booster on my input?

[chumbox]

Figure with the switch open the input would be 15nF and switch closed this should make it 3.75nF?

 

Thanks

[WaveshapeIllusions]

Not quite. The way it's drawn, the switch either leaves the 5nF cap connected or not. But there's still a short across it either way, so the cap won't do anything.

What you want to do is have the cap always in circuit and use the switch to put a short across it, effectively taking it out of circuit. Basically, move the switch to the wire up there instead of in front of the cap. Then with the switch open the cap will be in circuit; closed will take it out.

[chumbox]

Like this?

[psychedelicfish]

If you want a treble booster, what you want to do is attenuate all of your signal, except for the treble. What you have drawn so far will remove all bass, and with the values you said, will leave only treble with the "boost" switch activated. What you should do is have your signal go through a resistor, which will attenuate your signal, and "bypass" that resistor with a switched cap, which allows only the treble to pass through, and not be attenuated. I suggest starting off with a 100k resistor, and play around with the value (a smaller resistor will give you a more subtle treble boost, while a larger one will give you more boost), and use a cap somewhere from 1nF to 6.8nF (the larger the capacitor, the more of the higher mids you'll get as well).
Like this:


If you wanted a pot controlling the amount of treble boost, you could do this:

using a 100k pot, and a 1nF to 6.8nF capacitor

[chumbox]

Brilliant, that makes great sense.

Thanks everyone.