Hey guys!
I am currently building a Honey Badger, and I really want to get the best out of it.
So I was thinking: Which is better: To build this circuit to unbalance my signal AFTER it has entered the amplifier
Or just use my balanced line out as unbalanced?
What makes the amplifier better?
If I take the balancing circuit, then it has to go through another circuit, thus reducing my beloved fidelity
If I take the unbalanced circuit, some RF can harm my signal too (although my cables won't be longer than 1.5m).
So what do you guys think? Which option should I use?
I am currently building a Honey Badger, and I really want to get the best out of it.
So I was thinking: Which is better: To build this circuit to unbalance my signal AFTER it has entered the amplifier
Or just use my balanced line out as unbalanced?
What makes the amplifier better?
If I take the balancing circuit, then it has to go through another circuit, thus reducing my beloved fidelity
If I take the unbalanced circuit, some RF can harm my signal too (although my cables won't be longer than 1.5m).
So what do you guys think? Which option should I use?
Had a very similar dilemma once. After listening to both options went with just one phase. Possibly slightly higher noise from the source but generally a non-issue.
I would always chose a balanced/differential input stage even if the interconnect is unbalanced.
Look at the work of member tomchr and of Bruno P.
Look at the work of member tomchr and of Bruno P.
Partially thanks to Tom and also Bruno I feel balanced with good EMI filtering is a no-brainer, even with single ended sources. But that is me and my kids do think I'm odd 🙂
The THAT1200 series gives good CMRR and just for peace of mind I would chuck it in there.
The THAT1200 series gives good CMRR and just for peace of mind I would chuck it in there.
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Now that was an unexpected post.
One of Jim Brown's (the EMI/RFI expert) pet peeves is about poorly designed unbalanced inputs in hi-fi and Ham radio equipment. The poor designs make the equipment very sensitive to interference.
About 50 Jim Brown papers:
Audio Systems Group, Inc. Publications
May I chime in. I have a design I'm working on. My XLR input choices are THA1200 or OPA1632. The output signal should be differential at 1.5v VMR to introduce into an IC amp. I'm also limited to a +/-5v supply. I noticed many re designs seem to use +/-15v. Is there any reason for this?
I have found some guidance in the TI EVM for the PCM4204, page 17. I'm not using the PCM, just spotted 1632 schematics.
http://www.ti.com/lit/ug/sbau104a/sbau104a.pdf
http://www.ti.com/lit/ug/sbau104a/sbau104a.pdf
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reason for +/15V rails is the THAT chip will work at +20dBu pro levels, which is 22Vp-p
For a single ended CD player of 2V RMS you will get 5.6V p-p so if its to spec your rails should be ok. But depends on the source.
For a single ended CD player of 2V RMS you will get 5.6V p-p so if its to spec your rails should be ok. But depends on the source.
Thanks Bill. For example, my Meridian 568.2MM has analogue balanced outputs on the front three speakers. The specs say
3 x balanced outputs for left, right and center.
Outputs variable between 0 and 3.5Vrms, output impedance 47Ω
I don't really need to much higher, nor do I want to build a +/-15v supply as am using LP2985-50 for +5 from a 12v rail. Feed the output from the LM2985 into and LM2663 for -5v
3 x balanced outputs for left, right and center.
Outputs variable between 0 and 3.5Vrms, output impedance 47Ω
I don't really need to much higher, nor do I want to build a +/-15v supply as am using LP2985-50 for +5 from a 12v rail. Feed the output from the LM2985 into and LM2663 for -5v
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This looks interesting for 12V positive rail to ~ +/-10v. Expensive though.
http://cds.linear.com/docs/en/datasheet/3260fa.pdf
http://cds.linear.com/docs/en/datasheet/3260fa.pdf
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With the THA1200 how do you get to 0 to 3 v (centered around VMR 1.5v) suitable for going into into a differential ADC chip? The datasheet talks about traditional vout but I can't figure out how that applies to an ADC front end for shifting level. Google didn't return any diy kits using THA1200 to ADC or similar. The OP1632 is looking more appealing at the moment.
3.5V RMS is nudging 5Vp-p so your rails are too low. Also needs some checking onto exactly how the meridian output is done.
For a differential DAC a differential op-amp might be a better option for you.
For a differential DAC a differential op-amp might be a better option for you.
Ehrm okay.. That partially answered my questions.
Don't judge me, but I'm still learning and I really want to know which would be the Best.
I already have a Focusrite 18i8, which I want to connect to my Honey badger, but still no clue which is better.
Regards: Sebastian
Don't judge me, but I'm still learning and I really want to know which would be the Best.
I already have a Focusrite 18i8, which I want to connect to my Honey badger, but still no clue which is better.
Regards: Sebastian
Szia,
if You use it at home, with short interconnect cable, I would not use any converter in the amp, just connect the+ phase of the balanced output.
If You use it in some different environment, I would use the the converter to avoid any grounding, or noise issues.
Sajti
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