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Old 29th January 2013, 07:03 AM   #41
DQ828 is offline DQ828  Australia
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Originally Posted by Crom View Post
Hi DQ828,

I've been following your build with interest and been trying to work out what components you are using to provide the 12v trigger out. I'd like to get my power amp to switch based on the DAC/pre I'm building. I can see that you've got a 12v feed from the transformer but what happens after that?

Thanks for any help,
Crom
Ideally your Power amps will have a 12v Trigger input already built in, if they don't, you will need to build some sort of trigger device that you would plug the amps into. I'll run through what I have done in the hope it helps.

The only reason my trigger is 12v is that when I started this audio diy odyssey I had an AV Receiver that had 12v trigger outputs so I used them to control the system as I built it up. The trigger can be whatever voltage (ideally low voltage DC) is convenient as long as you can get relays with coils (could be SSR) that match the trigger voltage. I would probably use 5v if I wasn't tied into the 12v at the beginning.

With my existing DAC when I turn the power on with the remote (the Arduino inside the DAC is always on) the first thing it does is turn the DAC section on, so an Arduino output switches on a relay that connects the DAC's transformers to the incoming AC. Then the Arduino sends a signal (5v) to a relay (coil) (still inside the DAC) that switches on the 12v output which is supplied by the 12v SMPS, this output is connected to my ASP crossover, the incoming 12v switches on a relay (12v coil obviously) that connects the AC power inside the crossover. Then the Arduino does the same thing for the amps. Obviously you want the amps to turn on last & turn off first so the routine is reversed at turn off. The DAC and Crossover can actually turn on at the same time.

If you don't have triggers inside the amps, you would just need a small box with power AC entries in and out, a relay or 2 and an incoming trigger connection that would feed the power for the relay coil.

I hope this is not too confusing, if you need anything else just ask, but bear in mind I'm a carpenter not an electronics guy.

Last edited by DQ828; 29th January 2013 at 07:08 AM.
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Old 29th January 2013, 04:35 PM   #42
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Originally Posted by DQ828 View Post
..... but bear in mind I'm a carpenter not an electronics guy.
It doesn't look like you are not an electronics guy....nice work!

Is the Potato isolator board in your plans the one you prefer or to try first?
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Old 29th January 2013, 07:17 PM   #43
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OK thanks for clearing that up. it seems i'm not the only one that misread your claims of a reclocker as something external to what exists in the ESS dac itself, it is certainly framed as such; whether intentional or not it reads as a new feature that you have implemented; rather than something that has not changed since the Buff32.
That page text has not changes since the original ES9008 Buffalo. It was and is accurate. I think the confusion only arose since Ian's external reclocker was released.
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Old 29th January 2013, 08:11 PM   #44
DQ828 is offline DQ828  Australia
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Originally Posted by SCompRacer View Post
It doesn't look like you are not an electronics guy....nice work!

Is the Potato isolator board in your plans the one you prefer or to try first?
At this stage I will probably start without any board, just the Amanero then add the Potato board after, I thought I would use the Potato board as I already have the Potato chips.

I don't imagine this will happen in the short term, the USB input is really for the future as I dont play music directly from my computer (except via Squeezebox) at the moment but would like to try out the higher sample rate eventually.
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Old 29th January 2013, 08:31 PM   #45
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I don't imagine this will happen in the short term, the USB input is really for the future as I dont play music directly from my computer (except via Squeezebox) at the moment but would like to try out the higher sample rate eventually.
I don't have a permanent USB setup yet myself. I use a laptop with foobar and my 1TB external music back up drive connected to the laptop via USB for now. And it works fine, no issues other than no remote control like I have with the Touch and my smart phone. I was SB Touch via SPDIF coax out until I did the I2S mod/Teleporter out thing to it.

I will keep the best sounding setup. Not that I don't trust other opinions, its just like the racing days I want to see it on the time slip type thing....trust like love needs to be reaffirmed and all that.

The Amanero is quiet with no isolator (I'm not using USB power) so I am interested in trying the isolator and attaching the BIII clock to it.
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Old 2nd February 2013, 10:18 AM   #46
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The bracket to hold the Mega & screen in the prototype
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File Type: jpg 13-02-02 DAC 201.JPG (487.8 KB, 284 views)
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Old 3rd February 2013, 08:55 AM   #47
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I've made the prototype board the same size as the planned internal dimensions of the final build.

I have soldered header pins onto most of the Mega pins that aren't being used by the screen and made the bracket so they can be easily accessed.

I wont have much time in the next couple of weeks so it is going to be slow.
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File Type: jpg 13-02-03 DAC 201_1.JPG (720.4 KB, 266 views)
File Type: jpg 13-02-03 DAC 201.JPG (615.7 KB, 246 views)

Last edited by DQ828; 3rd February 2013 at 08:58 AM.
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Old 5th February 2013, 11:25 AM   #48
Crom is offline Crom  United Kingdom
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Originally Posted by DQ828 View Post
Ideally your Power amps will have a 12v Trigger input already built in, if they don't, you will need to build some sort of trigger device that you would plug the amps into. I'll run through what I have done in the hope it helps.

The only reason my trigger is 12v is that when I started this audio diy odyssey I had an AV Receiver that had 12v trigger outputs so I used them to control the system as I built it up. The trigger can be whatever voltage (ideally low voltage DC) is convenient as long as you can get relays with coils (could be SSR) that match the trigger voltage. I would probably use 5v if I wasn't tied into the 12v at the beginning.

With my existing DAC when I turn the power on with the remote (the Arduino inside the DAC is always on) the first thing it does is turn the DAC section on, so an Arduino output switches on a relay that connects the DAC's transformers to the incoming AC. Then the Arduino sends a signal (5v) to a relay (coil) (still inside the DAC) that switches on the 12v output which is supplied by the 12v SMPS, this output is connected to my ASP crossover, the incoming 12v switches on a relay (12v coil obviously) that connects the AC power inside the crossover. Then the Arduino does the same thing for the amps. Obviously you want the amps to turn on last & turn off first so the routine is reversed at turn off. The DAC and Crossover can actually turn on at the same time.

If you don't have triggers inside the amps, you would just need a small box with power AC entries in and out, a relay or 2 and an incoming trigger connection that would feed the power for the relay coil.

I hope this is not too confusing, if you need anything else just ask, but bear in mind I'm a carpenter not an electronics guy.
That's really helpful, thank you. The amps I'm connecting to already have a 12 input trigger so I guess all I really have to do is to add a 12v output socket to the DAC for which I'll need a separate 12v supply. Your point about getting the amps to switch on last is a good thought though. I'm planning a tube output stage, so I'd much prefer the tubes to be powered up before triggering the amps to switch on. So, I guess the inclusion of a relay might be necessary.

I am using a soft start module from here: http://www.hypex.nl/docs/softstart_datasheet.pdf

This allows me to use a push-button on/off rather than mains switch but your arduino solution is much more elegant. I will have to check out the whole arduino thing as I can sense a stage 2 and 3 coming to this project!
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Old 17th February 2013, 08:34 AM   #49
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In the first instance I have decided to go with Version 5 & will move on to V5a once it is up & working.

V5 uses relays for the Source switching & the SPDIF/DSD switching. The Arduino & BIISE are isolated except for the I2C connection, V5a will have an isolator on the I2C. The Amanero will not be isloated in this version but will be in the V5a version.

Have made a start on the wiring but things will progress slowly due to time constants, my fancy soldering iron stopped working last night so this morning I dragged out my old iron which came directly from China, what a difference, can't wait for the new one to be fixed. Fortunately it is still under warranty It's a bit disappointing that the new Weller which cost 3 x the Chinese one stop after 11 months of light work & the Chinese clunker is still going.
Attached Images
File Type: png 13-02-15 DAC 2 V5.png (558.4 KB, 199 views)
File Type: jpg 13-02-17 DAC 201.JPG (620.4 KB, 201 views)
Attached Files
File Type: pdf 13-02-14 DQ DAC 2 Control Setup V5.pdf (445.1 KB, 21 views)

Last edited by DQ828; 17th February 2013 at 08:36 AM.
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Old 17th February 2013, 09:58 AM   #50
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Just saw your version 5...looking good ;-)

I noticed one thing missing on the wiring of the shunt to the tube-i-zator board. Shouldn't the return wire be connected to both sides of the audio out put stage (basically, the next pcb-hole to the left of where you have your return connection coming back from the shunt)?
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