DCameronMauch
100+ Head-Fier
- Joined
- Dec 17, 2002
- Posts
- 166
- Likes
- 10
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I provided the schematic, tons of comments, and even the complete Eagle pcb file ready to be sent for manufacture.
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Not sure how you got the idea that this design was intended to be cheap. It isn't. It is physically small. Room for a few improvements, like biasing all the opamps into class A. But should compete nicely with most of the designs seen here. Especially since the headphones are driven differentially. Lots of advantages there.
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Yeah, I guess so. But having a nice small balanced output amp is somewhat cool. Can you help with the J-Fet isolation transistor choice?
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The design is single-ended input. You can use it with any normal source. The headphone jack does need to be replaced with a 4 conductor. I have already done that with all mine. Even the regular single-ended output buffer ground ones, so they all use the same connector, and avoid the temporary output shorting that happens with phono plugs.
Originally Posted by ezkcdude /img/forum/go_quote.gif Put up a schematic, and you may get more attention...I mean comments. |
I provided the schematic, tons of comments, and even the complete Eagle pcb file ready to be sent for manufacture.
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Originally Posted by jbloudg20 /img/forum/go_quote.gif My comment isn't going to be helpful so I have held back. But: I think the idea of a cheap balanced amp is basically an oxymoron. For the money, a builder is better off building a better two channel amp. However, I like your inginuity, and I like the use of the single ended to balanced converter. |
Not sure how you got the idea that this design was intended to be cheap. It isn't. It is physically small. Room for a few improvements, like biasing all the opamps into class A. But should compete nicely with most of the designs seen here. Especially since the headphones are driven differentially. Lots of advantages there.
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Originally Posted by motherone /img/forum/go_quote.gif I don't really have much to say. It's a straight-forward amp, basically a 4-channel PPA v1 with an OPA1632 and crossfeed. |
Yeah, I guess so. But having a nice small balanced output amp is somewhat cool. Can you help with the J-Fet isolation transistor choice?
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Originally Posted by nikongod /img/forum/go_quote.gif there is a schematic posted. its one of the photo links. they can be cool for portable use. since pretty much NOTHING which is even close to portable has a balanced out.... umm, yea, balanced etymotics er4s's are the hotness. koss ksc-75's do good too. |
The design is single-ended input. You can use it with any normal source. The headphone jack does need to be replaced with a 4 conductor. I have already done that with all mine. Even the regular single-ended output buffer ground ones, so they all use the same connector, and avoid the temporary output shorting that happens with phono plugs.