Aren't we usually!
On an aside, I will be responding to Brians questions tonight so you fellers can get the XGC up and moving!
On an aside, I will be responding to Brians questions tonight so you fellers can get the XGC up and moving!
Thankfully Yes, and seriously. what a blessing.
I am working on XBOSOZ #2 for my brother in law.
I am working on XBOSOZ #2 for my brother in law.
tnx boyz 😉
this little amp is in fact handwork of my friend Oly.....my responsibility was to force him to try something simpler than his usual Borbely approach
this little amp is in fact handwork of my friend Oly.....my responsibility was to force him to try something simpler than his usual Borbely approach
metalman said:Aren't we usually!
On an aside, I will be responding to Brians questions tonight so you fellers can get the XGC up and moving!
Would you be able to gander at the X-GC thread to shed some light on mine? Would be helpful. 🙂 No rush though, I'm slowly working through things, though so far it all checks out.
C
Yes I will I meant to earlier! Thanks for reminding me.
Please email me offline with a URL to the schematic you used and I will see what I can see.
Cheers!
Russ
Please email me offline with a URL to the schematic you used and I will see what I can see.
Cheers!
Russ
I'm in a middle of Chokyfying that messy preamp,still on paper....
so ,for starters I'm fooling around with schmtc;
like on this (just half way finished) isn't X-BOSOZ simpler with just one 50K - LM4040-10 string ?
redundancy,same as in KK's preamp with two parallel CCSs ?
or there is some other role ,that I don't see ?
so ,for starters I'm fooling around with schmtc;
like on this (just half way finished) isn't X-BOSOZ simpler with just one 50K - LM4040-10 string ?
redundancy,same as in KK's preamp with two parallel CCSs ?
or there is some other role ,that I don't see ?
Attachments
choky,
You are correct, only one is truly necessary. If you prefer simplicity, it doesn't even need to be a zener, or voltage reference. A simple resistor divider will also do the trick, provided your power supply is very, very quiet. There are many correct ways to make this circuit work well.
cheers, Terry
You are correct, only one is truly necessary. If you prefer simplicity, it doesn't even need to be a zener, or voltage reference. A simple resistor divider will also do the trick, provided your power supply is very, very quiet. There are many correct ways to make this circuit work well.
cheers, Terry
metalman said:
OK-I'm not too grumpy about that ....reinventing the wheel is not my favorite sport-at least not in this age 😉
I was just puzzled with that repeated voltage reference.......
btw-I learned all variations of KISS principle long time ago-in harder way....
and last part of sentence (often forgoten) "....but not simpler than necessary"...... is golden rule for me......
After going through this entire thread i'm also liking the design very much.
However it's not really clear to me on how to compare the kookaburra and the twisted xbosos
Right now I'm looking it as this:
the xbosos is a very good preamp and the kookaburra is a very good headphoneamp, which happens to work well as a preamp
so soundwise I'm thinking the xbosos is the best for all kinds of reasons
the kooka on the other hand has implemented digital volume control and PS and is very small so on a practical side this would be the better one
What's your input on this matter?
However it's not really clear to me on how to compare the kookaburra and the twisted xbosos
Right now I'm looking it as this:
the xbosos is a very good preamp and the kookaburra is a very good headphoneamp, which happens to work well as a preamp
so soundwise I'm thinking the xbosos is the best for all kinds of reasons
the kooka on the other hand has implemented digital volume control and PS and is very small so on a practical side this would be the better one
What's your input on this matter?
X-BOSOZ is also best used with the balanced output. If your amp is single ended, it may not be quite as good a choice.
On the other hand, if you're looking at the X-GC (which is what Terry designed this circuit with I think) or another balanced amplifier, clearly the X-BOSOZ is the way to go.
C
On the other hand, if you're looking at the X-GC (which is what Terry designed this circuit with I think) or another balanced amplifier, clearly the X-BOSOZ is the way to go.
C
cjd,
Didn't mean to ignore you earlier. Feel free to send me the same info you sent Russ, and I'll see if I can free up some time to take thew ol' swiss army knife to your problem as well. You can e-mail me directly at taben at dockmaster dot net.
brahmht,
The best advantage of the X-BOSOZ is that it is the swiss army knife of DIY preamps. It can work with any combination of BAL/SE IN/OUT. You can add digital volume control using the Jacobs Ladder attenuator that Russ put together. It will definitely be bigger than the Kookaburra. If this is a first project for you, and your only interested in single ended in/out, then the Kookaburra is probably the better choice. Then, after the DIY virus has taken you over, you can add the X-BOSOZ as a second preamp and compare them for us.
Cheers, Terry
Didn't mean to ignore you earlier. Feel free to send me the same info you sent Russ, and I'll see if I can free up some time to take thew ol' swiss army knife to your problem as well. You can e-mail me directly at taben at dockmaster dot net.
brahmht,
The best advantage of the X-BOSOZ is that it is the swiss army knife of DIY preamps. It can work with any combination of BAL/SE IN/OUT. You can add digital volume control using the Jacobs Ladder attenuator that Russ put together. It will definitely be bigger than the Kookaburra. If this is a first project for you, and your only interested in single ended in/out, then the Kookaburra is probably the better choice. Then, after the DIY virus has taken you over, you can add the X-BOSOZ as a second preamp and compare them for us.
Cheers, Terry
Finished soldering the last amp module on monday, got temporary wiring ready on thursday evening (night). The amp lies in pieces on the floor....
Both PS and pre worked right away. Testing with single ended input and output.
Sound - very good. Definitely a keeper.
Russ - one comment about the layout. There could be more room for the Dale's and the push-connectors.
I found the best way to build the pre with Dale's was to start with D1 and build my way out in all directions.
Both PS and pre worked right away. Testing with single ended input and output.
Sound - very good. Definitely a keeper.
Russ - one comment about the layout. There could be more room for the Dale's and the push-connectors.
I found the best way to build the pre with Dale's was to start with D1 and build my way out in all directions.
yggdrasil said:
Point taken.
One note. The board was designed for RN55 dales are regular pheonix or other 7mm type resistors. When Brian and I ordered the RN60s we did not realize how big they were, but since they still fit (but very tightly) we decided they were still OK.
Next round we will be using RN55s or pheonix as they are easily as good in this application.
As for the fastons that will be addressed in the next revision. I do realize they are a bit cramped, but with careful attention to how you orient them you will find they fit too.
I hope you enjoy the preamp. I am so glad it seems to have gone very smoothly for you.
Cheers!
Russ
bramht said:
I would agree here. While kookaburra is my own design and I am very proud of it and happy with it, honestly I would have to say the the XBOSOZ is indeed superior, at least to my tastes, and if you use the Joshua Tree attenuator with it you essentially have kookburra functionality (beside headphone drive capability) with superior accoustic results IMO.
Like Terry said though, there is quite a difference interms of complexity as well as cost and size, and certainly the kookaburra provides such good results and is so relatively inexpensive that it may make a better first project then the XBOSOZ, and will give you a refernce by which to judge other work later down the line. I doubt you will not be dissapointed with either preamp.
Also later you could use the kookburra in the same case as an XBOSOZ and use the kooka for headphone duty since it has next to zero output impedance which is good for headphones.
The attenuator for the XBOSOZ preamp in my experience works best on the output, that raises the final output impedance of the preamp which is not a problem when driving a power amp since most power amps have a high enough input impedance (as low as 1.5K should be OK) that it will not be an issue, but headphone impedances of 16 to 300ohms or so and the output impedance of 750ohms of the JT would not be a good match.
Cheers!
Russ
Well one thing I can add is that the sound is MUCH different from the two amps. They are both really good amps. After listening to both quite a lot, the difference is pretty obvious.
Hey Russ:
2 things
First - do you know the part number of the shoulder washers you send with the kit? Mine was short two (and two screws), but I need a bunch for the X-GC project as well so need to order either way. I'll eventually figure out which I need but if you can simplify the process. . . 😉
Second, please e-mail me chris at eldamar dot net - I sent an e-mail through the forum and haven't heard back so I'm not sure if it worked - at any rate, I need your addy to send you info on my X-GC.
2 things
First - do you know the part number of the shoulder washers you send with the kit? Mine was short two (and two screws), but I need a bunch for the X-GC project as well so need to order either way. I'll eventually figure out which I need but if you can simplify the process. . . 😉
Second, please e-mail me chris at eldamar dot net - I sent an e-mail through the forum and haven't heard back so I'm not sure if it worked - at any rate, I need your addy to send you info on my X-GC.