Dave_M
100+ Head-Fier
- Joined
- Sep 26, 2005
- Posts
- 186
- Likes
- 11
I have designed a new amp based on the TPA6120 chip. Seeing the price for headphone amps like the graham slee solo is one of the reason I got into DIY (no one told me DIY was so expensive ). I thought I could do a better job and this is what I came up with. I call it reference amp because it should be pretty neutral and transparent (aka straight wire with gain).
TPA6120 has a monstorous 1300 V/µs Slew Rate and should have no problems driving any normal headphone. There are amps that use this chip out there already, but they have some draw backs to them such as using an opamp input buffer and inverted output. My amp does not. I have also kept capacitors out of the signal path, it uses a DC servo instead to zero the offset.
I had a prototype board made at batch PCB, it came back and looks great. But when I was ordering parts I got everything I needed apart from the TPA6120! I tried to get free samples from TI but they wont send them to me. That was a few months ago. I don't think I will get round to finnishing the amp for quite some time (I don't even need a headphone amp right now). I wanted to post it here and see what people make of it (possible group buy?). I also designed a PSU for it, more details on that later maybe.
Feel free to ask me questions. But bare in mind I am no electronics expert.
TPA6120 has a monstorous 1300 V/µs Slew Rate and should have no problems driving any normal headphone. There are amps that use this chip out there already, but they have some draw backs to them such as using an opamp input buffer and inverted output. My amp does not. I have also kept capacitors out of the signal path, it uses a DC servo instead to zero the offset.
I had a prototype board made at batch PCB, it came back and looks great. But when I was ordering parts I got everything I needed apart from the TPA6120! I tried to get free samples from TI but they wont send them to me. That was a few months ago. I don't think I will get round to finnishing the amp for quite some time (I don't even need a headphone amp right now). I wanted to post it here and see what people make of it (possible group buy?). I also designed a PSU for it, more details on that later maybe.
Feel free to ask me questions. But bare in mind I am no electronics expert.