rsaavedra
Headphoneus Supremus
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Double post.
dynahi pictures
- Thread starter kevin gilmore
- Start date
rsaavedra
Headphoneus Supremus
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Quote:
Wonder exactly the same. Originally I was planning to possibly build the Dynahi using these condors, and then later on replace them with the Gilmore PS's, but I would rather build the latter ones from the get go.
I emailed Justin in www.headamp.com asking for Dynahi boards. There are Gilmore V2 circuit boards for sale in his Order page, but the website doesn't have anything Dynahi-related anywhere yet. (Mentioning this because Kevin told me to contact Justin about the fat boards).
| Originally Posted by Sbear Regarding a pcb group buy- count me in. A question regarding these condor power supplies- Are they any good? I mean it doesn't seem like you could build something from scratch for much less than 40 bucks a pop, even with less than best transformers and res. caps. So are these power supplies worthy to be used with this amp or they just to get by until Mr. Gilmore comes up with his own design? |
Wonder exactly the same. Originally I was planning to possibly build the Dynahi using these condors, and then later on replace them with the Gilmore PS's, but I would rather build the latter ones from the get go.
I emailed Justin in www.headamp.com asking for Dynahi boards. There are Gilmore V2 circuit boards for sale in his Order page, but the website doesn't have anything Dynahi-related anywhere yet. (Mentioning this because Kevin told me to contact Justin about the fat boards).
kevin gilmore
Señor Stax. Señor MAXX.
Can Jam '10 Organizer
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quote
Why does only three led's light up ?
Is the fourth led located on the right hand side, camera shy or dead ?
quite clearly you can see that the unit is NOT plugged in or turned on.
Thats a result from the flash lighting up the silicon... Really, no kidding.
When the led's are on they are very bright to the camera.
quote
You can't give a child candy and not expect his to eat it.
(my point is not that Mr Gilmore is a child ....)
Says who? Age has nothing to do with it.
I really like my camera. And I have 6megabit dsl at home. I really
don't care...
The power supplies are sufficient for the first prototype. Thereafter
the real units will be in a bigger box with one of my typically overspec'd
power supplies.
I'm keeping justin busy...
Why does only three led's light up ?
Is the fourth led located on the right hand side, camera shy or dead ?
quite clearly you can see that the unit is NOT plugged in or turned on.
Thats a result from the flash lighting up the silicon... Really, no kidding.
When the led's are on they are very bright to the camera.
quote
You can't give a child candy and not expect his to eat it.
(my point is not that Mr Gilmore is a child ....)
Says who? Age has nothing to do with it.
I really like my camera. And I have 6megabit dsl at home. I really
don't care...
The power supplies are sufficient for the first prototype. Thereafter
the real units will be in a bigger box with one of my typically overspec'd
power supplies.
I'm keeping justin busy...
Sbear
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Mr. Gilmore, can you elaborate on the word "sufficient" regarding the use of the condor. Do you mean the Condor makes the amp work but sounds like crap? or does it actually perform well?
Funds are kinda tight, at least for me, so I'm just trying to get the best bang for the buck.
Funds are kinda tight, at least for me, so I'm just trying to get the best bang for the buck.
aerius
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As the saying goes..."when your mom cuts a piece of cake for you for dessert, it's sufficient. when you cut the piece of cake yourself, it's enough". I'm not sure how well that applies to the situation here, but anyways....
kevin gilmore
Señor Stax. Señor MAXX.
Can Jam '10 Organizer
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The condor supplies put out enough current at a low enough noise
level and high enough stability to work just fine. They do get
extremely hot however. I would move up one size in power supplys and
2 sizes up in box. Or put the supplies in a seperate box.
level and high enough stability to work just fine. They do get
extremely hot however. I would move up one size in power supplys and
2 sizes up in box. Or put the supplies in a seperate box.
gavinbirss
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bump
bump
bump
gavinbirss
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Hello,
Sorry for seeming impatient but only once my modem got to posting my thread, I noticed that there were already replies.
Gavin
Sorry for seeming impatient but only once my modem got to posting my thread, I noticed that there were already replies.
Gavin
rsaavedra
Headphoneus Supremus
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Quote:
That's what am planning to do, and will leave the case for the supplies for the very end, leaving enough room for the ps upgrades.
Wonder if there might be another version (higher specs) for some other condor unit, or some other brand, that might still work fine with your amp while getting less hot.
| Originally Posted by kevin gilmore Or put the supplies in a seperate box. |
That's what am planning to do, and will leave the case for the supplies for the very end, leaving enough room for the ps upgrades.
Wonder if there might be another version (higher specs) for some other condor unit, or some other brand, that might still work fine with your amp while getting less hot.
gavinbirss
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Hello,
"quite clearly you can see that the unit is NOT plugged in or turned on.
Thats a result from the flash lighting up the silicon... Really, no kidding.
When the led's are on they are very bright to the camera."
I feel like a idiot now but this may prove that I need a larger screen to view Mr Gilmore's images at 1:1 view, at also short term memory to remember that there are no input and NO POWER.
I would appreciate a response to my third remark :
"The problem is the range of impedances this amp has to drive.
From 32 to 300 ohms. For low impedance phones you need the
bias turned up to keep the unit in class A for the entire audio
signal. For high impedance phones you could definitely turn down
the bias and still keep it in class A."
How would one go about changing the bias on the fly.
Does your preamp have a stepped attenuator and how many steps is needed for a 32 ohm load (grado) headphone to produce a dynamic (medium to loud) level.
How much is the gain in db for your prototype to power 32 ohm headphones.
Thanks
Gavin
"quite clearly you can see that the unit is NOT plugged in or turned on.
Thats a result from the flash lighting up the silicon... Really, no kidding.
When the led's are on they are very bright to the camera."
I feel like a idiot now but this may prove that I need a larger screen to view Mr Gilmore's images at 1:1 view, at also short term memory to remember that there are no input and NO POWER.
I would appreciate a response to my third remark :
"The problem is the range of impedances this amp has to drive.
From 32 to 300 ohms. For low impedance phones you need the
bias turned up to keep the unit in class A for the entire audio
signal. For high impedance phones you could definitely turn down
the bias and still keep it in class A."
How would one go about changing the bias on the fly.
Does your preamp have a stepped attenuator and how many steps is needed for a 32 ohm load (grado) headphone to produce a dynamic (medium to loud) level.
How much is the gain in db for your prototype to power 32 ohm headphones.
Thanks
Gavin
Prune
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Quote:
Browsers probably use a crappy resmapling algorithm for resizing images, and even when making them smaller, they get blurry and have artifacts. The bicubic in Photoshop is not very good either. The best practical resampler is a Lanczos-windowed sinc, which is close to the theoretical optimum. Irfanview is a great free multi-format viewer that offers Lanczos resizing.
| I feel like a idiot now but this may prove that I need a larger screen to view Mr Gilmore's images at 1:1 view |
Browsers probably use a crappy resmapling algorithm for resizing images, and even when making them smaller, they get blurry and have artifacts. The bicubic in Photoshop is not very good either. The best practical resampler is a Lanczos-windowed sinc, which is close to the theoretical optimum. Irfanview is a great free multi-format viewer that offers Lanczos resizing.
kevin gilmore
Señor Stax. Señor MAXX.
Can Jam '10 Organizer
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quote
How would one go about changing the bias on the fly.
Add a pot in parallel with the 100 ohm resistor in the 2nd stage.
say 200 ohms.
Does your preamp have a stepped attenuator and how many steps is needed for a 32 ohm load (grado) headphone to produce a dynamic (medium to loud) level.
Yes my preamp has a stepped attenuator (krell) i think it is 64 steps.
In any case it is enough. There is plenty of headroom to get to
100+db. Anyone listening any louder than this is looking for hearing
damage.
How much is the gain in db for your prototype to power 32 ohm headphones.
The schematic shows a voltage gain of 20. I cut it down to 12. The
reason i cut it down to 12 was i was testing with some ultra high
efficiency headphones (garbage) and thought there was too much gain.
Turns out the gain was not so high afterall. In any case a comfortable
volume is at 1 o'clock, and i try to set the gain for comfortable at
12 o'clock.
Quote:
I feel like a idiot now but this may prove that I need a larger screen to view Mr Gilmore's images at 1:1 view
Actually there is only one display device that i know of that can come
even close to the 4000 x 3000 resolution. That would be the sony
qualia2 projector. It is 4000 x 2200. It is not yet available. When it
is, the price will truely be impressive.
How would one go about changing the bias on the fly.
Add a pot in parallel with the 100 ohm resistor in the 2nd stage.
say 200 ohms.
Does your preamp have a stepped attenuator and how many steps is needed for a 32 ohm load (grado) headphone to produce a dynamic (medium to loud) level.
Yes my preamp has a stepped attenuator (krell) i think it is 64 steps.
In any case it is enough. There is plenty of headroom to get to
100+db. Anyone listening any louder than this is looking for hearing
damage.
How much is the gain in db for your prototype to power 32 ohm headphones.
The schematic shows a voltage gain of 20. I cut it down to 12. The
reason i cut it down to 12 was i was testing with some ultra high
efficiency headphones (garbage) and thought there was too much gain.
Turns out the gain was not so high afterall. In any case a comfortable
volume is at 1 o'clock, and i try to set the gain for comfortable at
12 o'clock.
Quote:
I feel like a idiot now but this may prove that I need a larger screen to view Mr Gilmore's images at 1:1 view
Actually there is only one display device that i know of that can come
even close to the 4000 x 3000 resolution. That would be the sony
qualia2 projector. It is 4000 x 2200. It is not yet available. When it
is, the price will truely be impressive.
The_Mac
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Quote:
The IBM T221 LCD can do 3840X2400, just in case you're looking for a new monitor for work. Needs two DVI connectors on the Vid Card though.
And nice looking amp Mr. Gilmore. Thanks for all your generosity to the DIY community.
| Originally Posted by kevin gilmore quote Quote: I feel like a idiot now but this may prove that I need a larger screen to view Mr Gilmore's images at 1:1 view Actually there is only one display device that i know of that can come even close to the 4000 x 3000 resolution. That would be the sony qualia2 projector. It is 4000 x 2200. It is not yet available. When it is, the price will truely be impressive. |
The IBM T221 LCD can do 3840X2400, just in case you're looking for a new monitor for work. Needs two DVI connectors on the Vid Card though.
And nice looking amp Mr. Gilmore. Thanks for all your generosity to the DIY community.
kevin gilmore
Señor Stax. Señor MAXX.
Can Jam '10 Organizer
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quote
The IBM T221 LCD can do 3840X2400
Absolutely right. We have one at work. I forgot about it. Its just plain
gorgeous. and cheap to at only $7500. The qualia2 is >$35000
The IBM T221 LCD can do 3840X2400
Absolutely right. We have one at work. I forgot about it. Its just plain
gorgeous. and cheap to at only $7500. The qualia2 is >$35000
The_Mac
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Quote:
Actually, prices have dropped to the point where they're only about $4K now, which is really nice. By far one of the best monitors out there for design. An acquaintance uses a pair for Katia work.
About the amp though, would there be any benefit to using a different LED than red where you have them now? Tangent mentioned that UV (or was it IR) LEDs are lower noise than even a red one, so would that be a suggested way to take it?
| Originally Posted by kevin gilmore quote The IBM T221 LCD can do 3840X2400 Absolutely right. We have one at work. I forgot about it. Its just plain gorgeous. and cheap to at only $7500. The qualia2 is >$35000 |
Actually, prices have dropped to the point where they're only about $4K now, which is really nice. By far one of the best monitors out there for design. An acquaintance uses a pair for Katia work.
About the amp though, would there be any benefit to using a different LED than red where you have them now? Tangent mentioned that UV (or was it IR) LEDs are lower noise than even a red one, so would that be a suggested way to take it?
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