Reason is simple, it is more comfortable , more convenient for remote control, it is simple to add some functions (eg. balance control, or sensitvity adjustment for each input -simple change in control program, I used it 14 years ago), without added costs. And for sound - "it is enough"..So why do it better and more complicated?
For sure they know how to do it better. And I know it, too, example in attachment..Whole preamp, 1V RMS output in 600ohm load. No harmonics higher than third..
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You are looking for something like this.
That's cooking for some time
Muses Modular:
stackable up to 8 units or more for multichannel with one external single controller
PADS for input and output
+/-18V header, or install a 78/7915 on the same header
5V Bias for Muses on board
Controller in the same size ore smaller with one board 5V regulator ,without display
rotary encoder or normal potentiometer
IR Receiver
Header for serial interface to configure offset for multichannel and active speaker systems.
learning IR control
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Yep thats it! Although I would prefer for simplicity and compactness the controller to be on board as in the Japanese configuration I posted earlier, I really think its very doable and desirable too!
I've been thinking about the controller on board, but for modular applications (e.g. 2 times for balanced ) it is better to get only one controller to the front.
That costs a little more, but it gives you more options for the mechanical integration.
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Nice and tidy! This is exactly what I had in mind Jap simplicity & creativity!
Hmmm I guess I realy have to contact my pic programmer as I already started the pcb this morning and going to finish that tonight! It is alot easier than initially anticipated!
Measurement is on whole preamp, balanced line in (1V RMS), balanced out loaded with 600ohm , relay attenuator regulation (impedance 1k), all discrete bipolar stages (balanced input, gain stage, relay regulation, balanced/unbalanced out, modular blocks.
I used more than 10years similar circuits like MUSES, but it is realy limited only to "midfi". Best results obtained with CMOS DAC in multiplying mode. But relays are way better..
The measurements are really great! And when it sounds good, then congratulations.
But if you have used similar like the muses, then you have just not tried muses.
I can not understand what makes the muses ' midfi ' for you. The data sheet and the measurements .
And what is now "midfi"? What do we need for Hi-Fi?
Good sounding compromises, because that is what we will ever get.
But if you have used similar like the muses, then you have just not tried muses.
I can not understand what makes the muses ' midfi ' for you. The data sheet and the measurements .
And what is now "midfi"? What do we need for Hi-Fi?
Good sounding compromises, because that is what we will ever get.
Spiri, best for me is, if it does not sound (without any "footprint"), so it is also my personal border between hifi and midfi. I am looking for best possible results without "unobtainium" components.
Similar like MUSES means the same concept, on chip resistors, with integrated switches (WM8816, PGA..). Limitation are inherent for MUSES, too. It is clearly visible from measuremets. Relays are "quasiperfect" .. It is clearly visible from measurements.
Similar like MUSES means the same concept, on chip resistors, with integrated switches (WM8816, PGA..). Limitation are inherent for MUSES, too. It is clearly visible from measuremets. Relays are "quasiperfect" .. It is clearly visible from measurements.
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for the MUSES Vdd while they don't seem to spec the Vdd current it looks like it has to be very small - they show ~250 kOhm internal load, call out 10 kOhm external series R for protection in the application circuit example
so deriving 5 V from V+/- analog supplies should be easy
the uC, other digital circuitry you need can be very low power with many of today's parts
so deriving 5 V from V+/- analog supplies should be easy
the uC, other digital circuitry you need can be very low power with many of today's parts
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Thats ok.
You can copy the schematic from our data sheets . (see links)
Our Muses board has a 5V regulator only for biasing the muses.
The controller and the relays are powered with a separate 7805 regulator
If you don't like to generate the digital voltage for the muses from the positiv analog voltage, make sure that there is a 10 kOhm in the DVDD line - pin 17.