I've built a small opamp preamplifier to connect headphone out signals (from an iPod or laptop) to something more suitable for line level. The circuit is a simple non-inverting amplifier using a dual opamp with a gain of about 6. It works very well, but I'm hearing a bit too much bass.
I've heard that many commercial headphone output circuits incorporate some bass boost to make up for the inadequate bass response in earbud-type headphones. This got me thinking--is there a way to gently reduce this bass input, perhaps some type of simple R/C filter on the preamp's input section?
Of course, I have no idea what the circuitry of an iPod's headphone output section, so I'd probably have to tune it by ear...
Any thoughts or ideas would be greatly appreciated.
I've heard that many commercial headphone output circuits incorporate some bass boost to make up for the inadequate bass response in earbud-type headphones. This got me thinking--is there a way to gently reduce this bass input, perhaps some type of simple R/C filter on the preamp's input section?
Of course, I have no idea what the circuitry of an iPod's headphone output section, so I'd probably have to tune it by ear...
Any thoughts or ideas would be greatly appreciated.
Two simple options:
1. input coupling capacitor, to form a first-order high-pass filter.
2. put a capacitor in series with a resistor, then put the combination in parallel with the resistor from the inverting input to ground - this gives a low frequency shelf cut.
1. input coupling capacitor, to form a first-order high-pass filter.
2. put a capacitor in series with a resistor, then put the combination in parallel with the resistor from the inverting input to ground - this gives a low frequency shelf cut.
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