I've been wanting to build up a good headphone amp for myself for awhile now, but seeing as how my Samson headphone amp is developing some, uhh..."Character," I've decided to look into making a new headphone controller/amp with hopefully a bit higher quality than what the Samson is giving me.
First up is the input bit.
I knocked that up in Tina-TI real quick. I really just glued a couple of pieces together from the pages of Douglas Self and Rod Elliot so credit goes to them for the input and EQ sections.
First stage de-balances, second stage provides some EQ (polarity kept by the unity-gain inverter in front of the EQ), then a bit of switching and a volume pot. After that it would go to an actual amp stage to drive the socks off of some headphones. First stage opamps should be a 5532. I'm wondering if the EQ stage wouldn't be better served with a TL072 or similar? Should I have a resistor in front of mute switch (say 100r or so) for current limiting since it (and the volume pot) just shorts the opamp output to ground?
Thanks,
James
First up is the input bit.
I knocked that up in Tina-TI real quick. I really just glued a couple of pieces together from the pages of Douglas Self and Rod Elliot so credit goes to them for the input and EQ sections.
First stage de-balances, second stage provides some EQ (polarity kept by the unity-gain inverter in front of the EQ), then a bit of switching and a volume pot. After that it would go to an actual amp stage to drive the socks off of some headphones. First stage opamps should be a 5532. I'm wondering if the EQ stage wouldn't be better served with a TL072 or similar? Should I have a resistor in front of mute switch (say 100r or so) for current limiting since it (and the volume pot) just shorts the opamp output to ground?
Thanks,
James