![]() ![]() Also I was told the size of the capacitor will also introduce more resistance into the signal which may or may not be an issue. Ideally I'm trying to get the cutoff point lower than 40Hz so that the phasing and cutoff are lower than what the headphones are capable of outputting. The headphones are the inductor, and usually headphones are somewhere between 15-30 impedance. 02 cap from ground to the leg of the optoisolator that connects to the 10 Meg resistor (brown/black/blue). I wanted to capacitor-couple and move the interstage transformer to a typical load position, and add a plate resistor, like a parafeed without the choke. I also have the headphone signal connected to a solid state relay, which will wait 2 seconds after my device is powered on before closing the circuit at that point (so the capacitor has time to fully remove the dc offset), so that if the headphones are already plugged in on power up they will be protected from the dc thump too.Īs far as I'm aware this essentially creates a highpass RLC filter. The more I read about this amp and listen to the YouTube clips, the less it seems to need. As you have probably guessed, the 1 Meg pot is going to give you an even brighter tone than a 500k pot. ![]() This potentiometer is the equivalent of 1,000k, which is twice the 500k, and four times greater than 250k. The headphone signal which is centered at 1.65V leaves the audio codec, it goes into the capacitor that removes the DC Offset, there is then a resistor afterwards which serves to charge the capacitor on power up to remove the pop when headphones will be plugged in and out. 1 Meg Pot There are plenty of values besides 250k and 500k, including the 1 Meg pot. So I'm trying to fool-proof my design so if the headphones get plugged into something like a line-in on an amplifier that shares the power source of my device, it won't cause any problems. Essentially what's happening is the audio codec that I'm using, which I am stuck with for reasons I won't get into, only has a headphone out that uses a virtual ground (1.65V), so it's really meant to be plugged into headphones only. I have attached a photo snippet from my kicad schematic here (I have chosen the values 300uF and 10k as a placeholder). Would you kind folks be able to help me out with these calculations? 1uF CAPACITOR 002-1022-001 Genuine Fender poly tone capacitor, PFF RDL. Just trying to figure out what forumlas/method to get the right capacitor and resistor values in my headphone out circuit here. 3.00 GENUINE FENDER 0.02MFD CAPACITOR 006-9010-000 Genuine Fender. I'm more of a programmer than someone who knows electronics. ![]()
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