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Buffalo II

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#283
OK Brian and Russ, I must say this is an amazing little dac, with 2 x SSR01 super regulators and placid with O-Netics output trannies. my active monitors (balanced) really sing. the sound is very clean and slightly more musical than V1, it has an ease in the articulacy that wasnt quite there before.

also I can confirm that there is zero need for any I/V resistor with the 600:600 line trannies from sumR, the impedance of the transformer is enough. atleast it sure sounds that wat to me. so it will live like this in a project box while I work on battery power solutions, I am going to have to buy at least another 1 tgho, these will make great presents fora couple of my friends.
 
#284
fierce_freak said:
I see the recommended voltage in for the Buffalo II is 5-5.5V and earlier in the thread it was said that you wouldn't be wise to go over 7v. Would I be ok with supplying 6V (battery) to the Buffalo II or have I answered my own question?
Click to expand...

If you using the AVCC modules we provide then I would use exactly 5.5V for best results. The AVCC modules is not designed to work with input over 5.5V. This is because we are using an ultra low noise opamp to control the shunt that has a max supply voltage of 5.5V and it works best right at that spot in testing.
 
#285
qusp said:
OK Brian and Russ, I must say this is an amazing little dac, with 2 x SSR01 super regulators and placid with O-Netics output trannies. my active monitors (balanced) really sing. the sound is very clean and slightly more musical than V1, it has an ease in the articulacy that wasnt quite there before.

also I can confirm that there is zero need for any I/V resistor with the 600:600 line trannies from sumR, the impedance of the transformer is enough. atleast it sure sounds that wat to me. so it will live like this in a project box while I work on battery power solutions, I am going to have to buy at least another 1 tgho, these will make great presents fora couple of my friends.
Click to expand...

Excellent, I am glad to hear you are enjoying it. 🙂

Cheers!
Russ
 
#286
qusp said:
also I can confirm that there is zero need for any I/V resistor with the 600:600 line trannies from sumR, the impedance of the transformer is enough. atleast it sure sounds that wat to me. so it will live like this in a project box while I work on battery power solutions, I am going to have to buy at least another 1 tgho, these will make great presents fora couple of my friends.
Click to expand...

So, what you are saying is that you can directly connect the output of the DAC to a 600:600 output trafo and be done with it. Is that correct?
 
#287
ra7 said:
So, what you are saying is that you can directly connect the output of the DAC to a 600:600 output trafo and be done with it. Is that correct?
Click to expand...

certainly seems that way to me. havent done any sweeps or measured the output of a full scale sine wave yet, but i'm certainly not lacking any gain. thought I would give it a shot without first before attaching the texas components resistive pots at the primary. I figured there is enough impedance to create a voltage across the traffo. no real DC to speak of, at the oputput of the buffalo II; so nothing to worry about there and any hash that might be there is probably mostly taken care of by the roll-off at 120k (something like that) 2. you could of course add an RC filter before if you like. thats what I find so appealing about transformer coupling. the elegance is significant 😀
 
#292
Got the Buffalo II and the TubiZator board to work. Sounds great! I also bought the Buffalo 32 with the integrated I/V board, I can say that this is just as clear but with added liquitity and 3D soundstage.

Good job, guys! This one is a keeper!
 
#297
A few questions for Russ or Brian:

-the Metronome has a very good onboard regulator, would it do any good to use a placid to feed that regulator ? current?

- In the manual it is stated that the Metronome eliminates (almost) any incoming jitter.
So upgrading the clock/regulators from my CDPRO2M is therefore useless ?

-The Volumite uses a 5k lin pot, can i use a 10k LIN Alps ?

- I'm a little confused about the powersupply for the IVYIII.
If I don't install j1~j4, do I need 3 BP placids (pwr1/pwr2/pwr3) to power the IVY ?
3x +/- 15V at what current must i set the placids ?

- The BuffaloII can work with 3 single placids by removing L6/L7/L8, at what current ?
Why are VD pads still there ? Can I still use the AVCCshunt in this situation ?


I hope these questions are worth answering and could help others. 🙂
 
#300
acidbrain said:
A few questions for Russ or Brian:

- The BuffaloII can work with 3 single placids by removing L6/L7/L8, at what current ?
Why are VD pads still there ? Can I still use the AVCCshunt in this situation ?


I hope these questions are worth answering and could help others. 🙂
Click to expand...

You cannot use Placids to generate 3.3V because the dual LED reference is already 4V. If you remove one LED, then the reference is 2V, but the opamp is not a "rail to rail" type which means the lower limit for the voltage is around 2V... I asked this before and you could experiment with replacing one LED with a diode, giving you something like 2.6V reference...

The 1.2V supply cannot be generated by Placid...
 
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