thx Russ.
A couple more questions, if you don't mind --
- you mentioned over in your head-fi thread your site links to that there are plans for an 'uber' controller -- something to control the volume inside the Wolfson DAC chip, and I see you've mentioned above using a microcontroller and being happy with it. It's a route I'd be interested in, but wondering if you do still have a plan for such a product, and if so when..? I've never had any luck with pots, prefer not to leave it to the PC to handle volume and don't want the added stage of a PGA2310 or something....
- for an LCDPS and LCBPS (for Opus and Ballsie) I have a couple of new and unused transformers in the parts bin gathering dust -- both Plitron 160VA 18v+18v (spec'd at 19.59v no-load) -- very slightly overkill 😉 on the rating I know but is the voltage too high??
thx and rgds, ssmith
A couple more questions, if you don't mind --
- you mentioned over in your head-fi thread your site links to that there are plans for an 'uber' controller -- something to control the volume inside the Wolfson DAC chip, and I see you've mentioned above using a microcontroller and being happy with it. It's a route I'd be interested in, but wondering if you do still have a plan for such a product, and if so when..? I've never had any luck with pots, prefer not to leave it to the PC to handle volume and don't want the added stage of a PGA2310 or something....
- for an LCDPS and LCBPS (for Opus and Ballsie) I have a couple of new and unused transformers in the parts bin gathering dust -- both Plitron 160VA 18v+18v (spec'd at 19.59v no-load) -- very slightly overkill 😉 on the rating I know but is the voltage too high??
thx and rgds, ssmith
ssmith said:
1) Yes, there is something in the works. 🙂 I will try to keep you folks posted.
2) Those transformers should be just fine.
Cheers!
Russ
Russ White said:
many thanks.
on the microcontroller.... appreciate you must be snowed under, but any hint as to when????!!!! Roughly....?
ssmith said:
Well I am working actively on it as time permits. My guess is in the next 1-3mos, but thats only a guess. There are several pieces to the puzzle. I have a couple of the major pieces designed. I just have to try everything out together, and then put it together (and document it) in a way that is approachable to most folks.
Cheers!
Russ
WM8740 Volume control
Hi,
has anybody yet used the internal volume control of the WM8740? Is it feasible or is it better to do the volume control after the DAC in the digital domain?
Thanks in advance!
Hi,
has anybody yet used the internal volume control of the WM8740? Is it feasible or is it better to do the volume control after the DAC in the digital domain?
Thanks in advance!
Re: WM8740 Volume control
Yes, I have, it works very well. No complaints. It seems to retain all of its pleasant attributes when used with the digital volume control.
I don't know if anyone else has yet or not.
Cheers!
Russ
_atari_ said:
Yes, I have, it works very well. No complaints. It seems to retain all of its pleasant attributes when used with the digital volume control.
I don't know if anyone else has yet or not.
Cheers!
Russ
Hey Brian,
Where did you get your Neutrik connectors? I can't find a place that has the USB connector.
How do you use the onboard volume control?
Where did you get your Neutrik connectors? I can't find a place that has the USB connector.
How do you use the onboard volume control?
The DAC (as far as I remember correctly) can be muted and the volume can be controlled with an microcontroller, using the build in interface. It has to be done by a micrcontroller since it is a specific protocoll (do not remember it correctly - I2C - not the I2S).
Dougie085 said:
Markertek has the Neutrik panel mount USB connector:
http://www.markertek.com/SearchProduct.asp?item=NAUSB&off=2
I believe the onboard volume control has to be done through the two wire serial interface.
Not sure where I got them actually, but even Mouser has them.
We have hacked the JT controller to use the Opus digital volume in the past.
We have hacked the JT controller to use the Opus digital volume in the past.
Re: Re: WM8740 Volume control
I am on my way building an preamping DAC (USB, SDPIF, 2xOpus, Metronom, Balsie, M3 for Headphone). Everything controlled by an microcontroller (my own Atmel-based solution) and with a decent remote. Everything without knobs, basing on something like this (leds – dou or array – as touch sensors).
Dont expect anything before winter – will be a bigger project 😉
Russ White said:
I am on my way building an preamping DAC (USB, SDPIF, 2xOpus, Metronom, Balsie, M3 for Headphone). Everything controlled by an microcontroller (my own Atmel-based solution) and with a decent remote. Everything without knobs, basing on something like this (leds – dou or array – as touch sensors).
Dont expect anything before winter – will be a bigger project 😉
A/D converter advice....
Hi DIYs,
I am looking for advice on A/D converters - maybe somebody here knows about a superb sounding A/D converter chip ... e.g. 20-24 bit at e.g. 400 kHz sampling frequency (or, if not possible at 192 kHz) w/o internal filters, oversampling or digital conversions?
Or a low-order (e.g. second or third order) delta-sigma A/D converter capable of operating at 11,289 MHz and with a "straigthforward"/standardized output? Again without internal conversions of any kind...
I'm looking for a design having the potential for outstanding sound - not necessarily the best possible data.
Suggestions are appreciated
Jesper
Hi DIYs,
I am looking for advice on A/D converters - maybe somebody here knows about a superb sounding A/D converter chip ... e.g. 20-24 bit at e.g. 400 kHz sampling frequency (or, if not possible at 192 kHz) w/o internal filters, oversampling or digital conversions?
Or a low-order (e.g. second or third order) delta-sigma A/D converter capable of operating at 11,289 MHz and with a "straigthforward"/standardized output? Again without internal conversions of any kind...
I'm looking for a design having the potential for outstanding sound - not necessarily the best possible data.
Suggestions are appreciated
Jesper
Re: A/D converter advice....
All of the Twisted's DAC's sounds great! But it kind of seems like your question is more of a general nature? You did ask in the "Opus" thread, though! You are welcome to send me a PM.
If you dont want to do that, your best bet is to wait for the Buffalo😉
🙂
gentlevoice said:
All of the Twisted's DAC's sounds great! But it kind of seems like your question is more of a general nature? You did ask in the "Opus" thread, though! You are welcome to send me a PM.
If you dont want to do that, your best bet is to wait for the Buffalo😉
🙂
Hi steenoe
Thanks - but I'm looking for advice on ADCs and not DACs 😉 Seems there are many people doing DACs but only a few doing ADCs....
And, yes I know that I asked in a thread with a different focus. My thought was that maybe some of you knew about this as well.
Regards,
Jesper
Thanks - but I'm looking for advice on ADCs and not DACs 😉 Seems there are many people doing DACs but only a few doing ADCs....
And, yes I know that I asked in a thread with a different focus. My thought was that maybe some of you knew about this as well.
Regards,
Jesper
Hi,
I am one (little step) further in planning for my DAC (OPUS, Metrnome, USB, prob. SPDIF).
Now I am thinking about the power supply:
Is 2*9v for the DAC sufficient? And how should it be spend?
9v for Controller, SPDIF and DAC, 9v for DAC analogue & metronome or
9v for Controller, SPDIF, DAC Metronome and 9v for DAC analogue?
The 9v will of course be regulated to something like 8v/5v respectively (The OPUS, Metronome and SPDIF have regulators for smaller voltage on board?!)
I am one (little step) further in planning for my DAC (OPUS, Metrnome, USB, prob. SPDIF).
Now I am thinking about the power supply:
Is 2*9v for the DAC sufficient? And how should it be spend?
9v for Controller, SPDIF and DAC, 9v for DAC analogue & metronome or
9v for Controller, SPDIF, DAC Metronome and 9v for DAC analogue?
The 9v will of course be regulated to something like 8v/5v respectively (The OPUS, Metronome and SPDIF have regulators for smaller voltage on board?!)