@jmc_1965:
It is possible to set the volume step/encoder step.
The Alps encoder STEC11B03 is a 30 step encoder.
It is also possible to set the start volume. It is never necessary to rotate the full muses range.
@bambadoo:
I always use 15-18V
It is possible to set the volume step/encoder step.
The Alps encoder STEC11B03 is a 30 step encoder.
It is also possible to set the start volume. It is never necessary to rotate the full muses range.
@bambadoo:
I always use 15-18V
Thanks alot.
BTW: When powering up for the first time without 4 digit led and without remote. What is the best method to see if everything is ok?
BTW: When powering up for the first time without 4 digit led and without remote. What is the best method to see if everything is ok?
To measure with a test signal.
Practical way: put the muses in line to another preamp to limit the max volume and listen.
Practical way: put the muses in line to another preamp to limit the max volume and listen.
Super. No smart way checking if everything is ok without connecting to other audio equipment?
Found a decent PSU and doing some initial tests.
approx +-14Vdc in. However R1=100ohm on the controller board get extremely hot. (actually so hot the solder smelted) Also the 5v LDO gets hot. https://no.mouser.com/ProductDetail...f//tDZEZckA==&countrycode=NO¤cycode=NOK
R1, is 1/10watt resistor it seems.... Too small?
I do not get 5V out of it. (0.7V) Approx 1.2V enter the LDO.
D1 and D2 are https://no.mouser.com/ProductDetail...8aNy7/u4kVw==&countrycode=NO¤cycode=NOK
Been tracing "everything" according to schematics. Unable to find what is wrong. Dont think I have reversed D1 and D2...
Found a decent PSU and doing some initial tests.
approx +-14Vdc in. However R1=100ohm on the controller board get extremely hot. (actually so hot the solder smelted) Also the 5v LDO gets hot. https://no.mouser.com/ProductDetail...f//tDZEZckA==&countrycode=NO¤cycode=NOK
R1, is 1/10watt resistor it seems.... Too small?
I do not get 5V out of it. (0.7V) Approx 1.2V enter the LDO.
D1 and D2 are https://no.mouser.com/ProductDetail...8aNy7/u4kVw==&countrycode=NO¤cycode=NOK
Been tracing "everything" according to schematics. Unable to find what is wrong. Dont think I have reversed D1 and D2...
Hi meldano;
Keep up your god work.
- Is it possoble to use another step/encoder that has two separared channels, use one channel for controling the volume bords and use an outher channel via optocoppler to be able to creatde a galvanic separate volume display outputs?
Or has this been tested already?
Keep up your god work.
- Is it possoble to use another step/encoder that has two separared channels, use one channel for controling the volume bords and use an outher channel via optocoppler to be able to creatde a galvanic separate volume display outputs?
Or has this been tested already?
Hi Meldano,
Very interesting project! One thing I would do though is keep the PSU on a separate or detachable PCB, to avoid having AC lines so close to the signal.
Do
Very interesting project! One thing I would do though is keep the PSU on a separate or detachable PCB, to avoid having AC lines so close to the signal.
Do
Hi Do,
it is possible to connect dc direct and set jumpers.
On the silkscreen you can see the jumper positions.
Daniel
it is possible to connect dc direct and set jumpers.
On the silkscreen you can see the jumper positions.
Daniel
Yes 78/79 from NJR. You can use Sigma 11, New Class D UWB2 or Belleson 😉
Today I assembled the balanced prototype
Attachments
Voltage regs
I tested a lot of different regulators with the muses.
My favorites are the TI TPS7A
Here two TPS7A wich are compatible with the 78/7915
SIGMA78 Low Noise LDO Voltage Regulator +15V - Audiophonics
SIGMA79 Low Noise LDO Voltage Regulator -15V - Audiophonics
I tested a lot of different regulators with the muses.
My favorites are the TI TPS7A
Here two TPS7A wich are compatible with the 78/7915
SIGMA78 Low Noise LDO Voltage Regulator +15V - Audiophonics
SIGMA79 Low Noise LDO Voltage Regulator -15V - Audiophonics
Hi, meldano muses 72320 implemented in my dcg3 preamp. Sounds great.
A couple of questions.
1. Slight hum in one channel. Was not there with the former pot. Any obvious suggestions? (I know its a tricky one 🙂 )
2. Is there a mute trigger or something when poweroff? It keeps playing distorted sounds a while after power has been shut off. Any suggestions getting rid of that?
3. r20 and r21 (100r) on the outputs. What is the purpose? Could they be "shorted"?
Sorry if these have been answered before.
A couple of questions.
1. Slight hum in one channel. Was not there with the former pot. Any obvious suggestions? (I know its a tricky one 🙂 )
2. Is there a mute trigger or something when poweroff? It keeps playing distorted sounds a while after power has been shut off. Any suggestions getting rid of that?
3. r20 and r21 (100r) on the outputs. What is the purpose? Could they be "shorted"?
Sorry if these have been answered before.
1. Sorry, no idea. I have no hum/noise in my application
2. without power supply, the muses is in undefined resistor ladder status. One solution is a mute relay
3. you can short these resistors. In case of mute to gnd the resistors will do a good job.
Daniel
2. without power supply, the muses is in undefined resistor ladder status. One solution is a mute relay
3. you can short these resistors. In case of mute to gnd the resistors will do a good job.
Daniel
Daniel's opinion will matter most—but—I too have had his boards in my DCG3 (Also F. Wilker's solution)... Check the connections of the Muses chip. I had some really weird stuff happen, not unlike what you describe, until I took a very close look at all the solder connections on the Muses chip. My "way" of soldering that chip was to use a ton of extra flux, flood the legs with solder, and then use fine wick to pull out the solder until I saw complete separation between all the legs but good connections. Definitely the most challenging part of the build.
Why make it complex? Skip the dreaded 78xx/79xx and go directly for the way better TPS7A4901 and TPS7A3001. Why would one need to buy something made in an old format made by audiophoolery manufacturers? The power consumption also does not dictate the use of TO220 regulators...One could also use modern ultra low noise regs and still add pads for 78xx/79xx. Two birds with 1 stone. Those that want to do it right at once will like it and those that think 78xx/79xx are "good enough" will also be happy.
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