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Old 2nd August 2011, 06:37 PM   #251
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The current draw on the IVY-III is not really effected by the gain Rs.

The current draw on the Legato 3.1 is entirely dependent on the gain Rs along with CCS.

In my test each side of the Legato 3.1 core cct drew about 25-30ma. Add in the buffers and it will be a bit more than that. My guess is something like 100ma per Legato with buffers. I will have to do more testing to give an exact number.
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Old 2nd August 2011, 06:40 PM   #252
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My guess is something like 100ma per Legato with buffers. I will have to do more testing to give an exact number.
Will depend on the load as well...
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Old 2nd August 2011, 07:14 PM   #253
Takaji is offline Takaji  Canada
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Originally Posted by LeonvB View Post
You question was answered before you even wrote it down:
I didn't put 2+2 together, but after reading it again I did
Looks like I will have the budget for 4x IVY III boards after all, if they only require the one power supply...
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Old 2nd August 2011, 07:23 PM   #254
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Will depend on the load as well...
Sure, but that's a given for both IVY-III and Legato. that's the only reason I didn't mention it.

In multi-channel use usually the load is rather high impedance and really should not be as much a factor as say for stereo headphone driving use.
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Old 2nd August 2011, 08:41 PM   #255
LeonvB is offline LeonvB  Netherlands
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Looks like I will have the budget for 4x IVY III boards after all, if they only require the one power supply...
I would wait to see what Russ finds out about the current required.

@Russ:
I agree the typical usage would be into a multi-channel amp, I doubt anyone would try to do 7.1 into a headphone
Would using balanced vs. SE matter? Most multi-channel amps would only have SE inputs, but multi-channel balanced amps do exist.
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Old 2nd August 2011, 09:17 PM   #256
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Well if one were doing pure balanced they could totally omit the bal/se stages on both IVY and Legato including the buffer this would cut down the current draw even more.

With legato SE output will be great with or without the buffers as it totally removes any concerns about the highish output impedance of the balanced I/V stage itself.

For the SE output task both Legato and IVY are very evenly matched.

As long as the input impedance of the next stage is high they are also evenly matched for the balanced output.

It is only in the case of a low impedance balanced load while in stereo mode that IVY-III is clearly superior. In mono mode the Legato is actually better for driving low impedance balanced loads because of the buffers.

Cheers!
Russ
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Last edited by Russ White; 2nd August 2011 at 09:55 PM.
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Old 2nd August 2011, 09:48 PM   #257
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Would using balanced vs. SE matter? Most multi-channel amps would only have SE inputs, but multi-channel balanced amps do exist.
My dream set-up would be to run a Buffalo III into 8 Hypex amps. I have my Buffalo II going into 2 of them right now and it is a sweet sound.
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Old 2nd August 2011, 10:56 PM   #258
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Could you please answer on questions regarding building a single multichannel I/V stage or BIII embeded I/V stage, if this is in future plans and has BIII option implemented to use programmable filter? How can I use in BIII a voltage-output mode? In this case can I use BIII outputs directly as SE outputs?
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Last edited by AndriyOL; 2nd August 2011 at 11:04 PM.
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Old 2nd August 2011, 11:25 PM   #259
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Could you please answer on questions regarding building a single multichannel I/V stage or BIII embeded I/V stage, if this is in future plans and has BIII option implemented to use programmable filter? How can I use in BIII a voltage-output mode? In this case can I use BIII outputs directly as SE outputs?
Regards.
Negatory. You would never want to do that.

You could program the ES9018 with filter coefficients, but it will never an active crossover make.
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Old 3rd August 2011, 06:26 AM   #260
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Negatory. You would never want to do that.

You could program the ES9018 with filter coefficients, but it will never an active crossover make.
Why not?
You didn't mentioned any register setting for filter customization. How will it effect?
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