Muses Volume

[meldano]

Switch power on during encoder pressed and check the led again.

 

[aditya]

Potentially a dead controller?
I got +15 and -15v. J1 with 2 and 3 bridged. 3.3v on X1.6
No LED blink or anything when powered on.

Check that led out of circuit

 

[mcluxun]

Switch power on during encoder pressed and check the led again.

No luck, I have a scope, can I hook that to a pin to see if there's a heartbeat?

 

[meldano]

No heartbeat.
You can check the spi lines to the muses.
After power on the controller initialize the muses one time.

 

[mcluxun]

I think I got it running. with the help of my apple tv remote. The question is can I use apple TV remote to program it to run in balance mode? or do i need a remote with buttons.

 

[meldano]

👍🏼 perfect
please have a look to the documentation
you need keys from 0..9

 

[mephjstopheles]

Could be interesting: https://www.diyaudio.com/community/...ncoder-for-muses-72323-volume-control.390237/

Did you change anything in the posted gerbers to be able to use the 32ppr?
If you have another board/bourns to spare, I'd be happy to take it.

 

[tombo56]

There are no changes related to number of ppr EM14 encoder has. As Meldano’s V2 volume control has adjustable volume step per one pulse, from 0.25 to 2 dB, encoder with 64 ppr is a better choice.

 

[namghiwook]

I've finally soldered all boards (main / controller / volume).

I have a transformer. It has secondary 18-0-18(center-tap not dual), 8-0-8(center-tap not dual).
I've connected the transformer and main board like this ( https://www.diyaudio.com/community/attachments/img_4612-jpg.949600/ ) and heard weird sound (du-du-du-du-du) from the transformer.

Is this connection not possible?
Do I need to purchase a new transformer that has secondary dual 18-0 and single 8-0 ?

 

[Chris In Milwaukee]

That's a good question. I used an 18x2 and a 9x2. But I can't imagine why a center tap wouldn't work.

How does your DC read after the regulators?

 

[namghiwook]

That's a good question. I used an 18x2 and a 9x2. But I can't imagine why a center tap wouldn't work.

How does your DC read after the regulators?

I felt some risky, so turned off the main power immediately.

 

[meldano]

Please show us the connection between transformer and the pcb.
You can also connect the digital or analog line separate and check/measure the behavior.

 

[namghiwook]

Please show us the connection between transformer and the pcb.
You can also connect the digital or analog line separate and check/measure the behavior.

The connection is like this.

 

[meldano]

- Connect only the 18-0-18 line and measure the dc voltage after the regs

- Connect only the 0-8 line and measure the dc voltage after the regs

 

[namghiwook]

- Connect only the 18-0-18 line and measure the dc voltage after the regs

- Connect only the 0-8 line and measure the dc voltage after the regs

I ordered a new transformer that has dual 18V and single 8V.
I will try with that later.
Thank you.

 

[freebee]

Could someone please let me know which header to use to stack the volume attenuator to the main board? I thought I had followed the BOM to the letter, however the pins aren't long enough.

 

[namghiwook]

Could someone please let me know which header to use to stack the volume attenuator to the main board? I thought I had followed the BOM to the letter, however the pins aren't long enough.

I've bought two stackable 10 pin headers like below.

https://www.sparkfun.com/products/11376

 

[freebee]

Thanks 👍. Those were missing from the BOM 😃. Still have to work out how to set all the jumpers, but than I'm good to go.

 

[freebee]

Could someone please explain how I should have the jumper settings for unbalanced using Main board, controller and volume ?

 

[freebee]

There appears to be a problem with the controller board as I don't get 15v (only approx. 1V) at X1 pin 1. Pin 3 measures -15v. Any idea where I should look? The other boards measure both 15v and -15v at resp. pin 1 and 3.