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2x Gain pure op-amp headphone amp idea
2x Gain pure op-amp headphone amp idea
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Old 10th September 2011, 02:05 AM   #31
hwfanatic is offline hwfanatic  Serbia
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Originally Posted by Rembrant View Post
You don't need to. The PC power supply has +12, -12v, and ground. The molex has +12, +5 and ground. You can tap the -12v from the board connector.
Tapped it. Needs extra filtering, but will do the trick while the project is still on the proto-board. Abandoned biasing altogether. Will build a proper PSU when it's done.
Originally Posted by jcx View Post
also check out The Objective2 (O2) Headphone Amp DIY Project

the associated home page links to pretty complete design Blogs on parts selection, parallel op amps and lots more
This is probably the best advice. Learned a lot. Adopted the basic idea. Enough said.
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Old 6th August 2017, 05:09 PM   #32
xrk971 is offline xrk971  United States
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2x Gain pure op-amp headphone amp idea
It also cannot work until 24v single supply. I've tried to split with LM317 (totally fail) with TDA2030 (oscillating) and with resistor divider. In all cases the gnd point always swinging between (+) and (-) rails. (Thats weird!)
Here is a cheap TDA2030 headphone amp with single supply rail from amlinear regulator. I just tried out and it's very decent sounding.

TDA2030 Coffee Money Headphone Amp

Works quite nicely.
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Last edited by xrk971; 6th August 2017 at 05:11 PM.
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