I purchased one yesterday, new for $45. I read a lot of reviews and it scored extremely well... especially given its price point. BUT... It is my understanding that there are some DIY upgrades available that bring it to a whole new level.
Has anyone here purchased a Muse? How do you like it?
Also has anyone performed the upgrades. .. if sovcan you tell me about them?
I would like to know where you got the upgrade kit, and what level of complexity was there in installing it?
Also... do you think that the upgrade makes a real difference?
Thanks do much for any help
Has anyone here purchased a Muse? How do you like it?
Also has anyone performed the upgrades. .. if sovcan you tell me about them?
I would like to know where you got the upgrade kit, and what level of complexity was there in installing it?
Also... do you think that the upgrade makes a real difference?
Thanks do much for any help
I have modded the Muse 4 * TDA1543 extensively and it subjectively improved a lot. Does your Muse have 4 DAC chips or only 1? The mods I did to the 4 DAC version I think could be transported to a single DAC model.
I'm not aware of an upgrade kit, I followed my own practices and used components from my own stocks.
I'm not aware of an upgrade kit, I followed my own practices and used components from my own stocks.
sound quality
The best choice is 1 TDA1543 or 4 TDA1543 the second
increase dither ... pull up noise level but have a good Fourier
response 😕
The best choice is 1 TDA1543 or 4 TDA1543 the second
increase dither ... pull up noise level but have a good Fourier
response 😕
I have have one which I have not modded. Honestly, I was extremely happy with the DAC's performance and I am not sure if it is worth the effort for the gain. I am keeping my eyes open for options, however...
So how does it objectively perform after modding?
Archimaho's measurements says the stock form is pretty bad. THD is way worse compared to TDA1543 datasheet of 0.018%. I want to try to at least get it to below 0.1%
I'm thinking of giving it a proper output stage as per page 3 of datasheet. Feels to me like the passive I/V is where it is losing its THD performance at.
Edit: Looks like a TDA1543 when well-implemented does hit the 0.018% spec, as evident here:
http://www.soomal.com/doc/10100003803.htm
Archimaho's measurements says the stock form is pretty bad. THD is way worse compared to TDA1543 datasheet of 0.018%. I want to try to at least get it to below 0.1%
I'm thinking of giving it a proper output stage as per page 3 of datasheet. Feels to me like the passive I/V is where it is losing its THD performance at.
Edit: Looks like a TDA1543 when well-implemented does hit the 0.018% spec, as evident here:
http://www.soomal.com/doc/10100003803.htm
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The stock design seems to have wrong value resistors? Need confirmation on this.
Some sources say the VDD to the TDA1543 is 5V. Which means the maximum Riv is 869ohm for one DAC chip.
According to this source, the I/V is 680ohm but shared between 4 DAC chips, making it way overvalued. 😱 I should be using 150ohm to 100ohm instead.
I can probably afford to buy a pot for the bias, makes future modification to TDA1387 easier too.
Some sources say the VDD to the TDA1543 is 5V. Which means the maximum Riv is 869ohm for one DAC chip.
According to this source, the I/V is 680ohm but shared between 4 DAC chips, making it way overvalued. 😱 I should be using 150ohm to 100ohm instead.
I can probably afford to buy a pot for the bias, makes future modification to TDA1387 easier too.
The more I calculate the less sense it makes
One R_bias of 390ohm is shared by 4 DAC chips, V_ref is 2.2V so total I_ref = 5.64mA, total I_bias = 11.28mA which with a 680ohm R_iv sets the output voltage centered at 7.67V ???
Add: And the LM317's output is 7.625V ??
One R_bias of 390ohm is shared by 4 DAC chips, V_ref is 2.2V so total I_ref = 5.64mA, total I_bias = 11.28mA which with a 680ohm R_iv sets the output voltage centered at 7.67V ???
Add: And the LM317's output is 7.625V ??
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Some multimeter later,
Which means... V_ef is 2.063V, I_ref is 5.3mA, I_bias is 5.7mA, I_bias gain is ~1.07x
Right...
And V_bias is 3.85,V, and Vcc is 7.60V.
Which means... V_ef is 2.063V, I_ref is 5.3mA, I_bias is 5.7mA, I_bias gain is ~1.07x
Right...
And V_bias is 3.85,V, and Vcc is 7.60V.
Ahh man, I forgot this forum prevents editing of posts that are too old
Full scale output voltage = 2Vrms
Which means highest peak output voltage is 6.7V w.r.t. power supply ground, and lowest is 1V.
And I_p-p = 2.08mA per IC
Right...
Temperature:
Temperature at the heatsink of TDA1543 is pretty ok
However the same can't be said for the LM317. Still within limits, but this stops my plan of reducing Vcc to 5V.
Full scale output voltage = 2Vrms
Which means highest peak output voltage is 6.7V w.r.t. power supply ground, and lowest is 1V.
And I_p-p = 2.08mA per IC
Right...
Temperature:
Temperature at the heatsink of TDA1543 is pretty ok
However the same can't be said for the LM317. Still within limits, but this stops my plan of reducing Vcc to 5V.
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