Treble lift circuit-help needed

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dragonweed

dragonweed

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Joined 2010
#1
I need a treble lift circuit (active, with no insertion loss) for a specific application, which has a linear response up to 10 kHz (unity gain), then rising to +6 dB at 20 khHz. Any help would be appreciated...
I found this one, but I am no good at Spice - would something like this be OK? (with symetrical supplies and a better opamp of course...)
 

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#4
OK 🙂

That circuit won't do what you want, the response takes off at an alarming rate.

Anyway, I can live without this...
Click to expand...

My comments you mean 😀 or the filter circuit.

So flat response to 10kHz then rising to +6db @20kHz. I'd have to think about that one.
 

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#6
You don't need to learn Spice. All you need to learn is what your requirement is called: a shelf. In particular, an HF shelf. And an increasing one, not a decreasing one. That assumes that you want the response to level off at 20kHz and not continue upwards.

I guess the very simplest way to achieve this is to have a 0.5 (i.e. -6dB) potential divider used as an attenuator with a capacitor across the upper resistor to give the boost. Then follow it with a x2 (+6dB) gain opamp. You could combine the two, but this would require you to think about feedback.
 
#8
I think tbh you would be looking at combining filters to do this. You also have a possible issue with the hf continuing to rise past your 20kHz limit. So you might need more filtering to tame that back down.
 

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