MrMajestic said:
Great work!
A couple things to do before you apply power:
1) Set the bias pot (configured as a rheostat) to maximum resistance (measure across the outer pins), so you can adjust the bias upward later.
2) Remember to set the offset pot to the mid point (equal resistance from the center pin to each end) to start so that the offset is not wildly one way or the other.
Then on power up adjust the bias up to the desired level.
Then adjust the offset pot until the offset is at 0V.
Cheers!
Russ
I received the LCBPS from TP today, thanks guys 🙂 Going to assemble it tomorrow. Im going to take this opportunity to reach out to both Ryssen and Nelson Vandal : Are you still wanting boards, because you dont reply to my emails!! I need someone to build the first batch of boards besides myself.
halo, sorry for my bad english.
I looking for buffer, how many gain in standart schematic ?
can i reduce the gain until <1 (Buffer).
if can, what parts should i change.
I looking for buffer, how many gain in standart schematic ?
can i reduce the gain until <1 (Buffer).
if can, what parts should i change.
It will work fine as a unity gain buffer.
Just omit RG and make RF something like 4.7K
Cheers!
Russ
Just omit RG and make RF something like 4.7K
Cheers!
Russ
KLe said:
With the BC550/560 as output devices it will be limited to ~ 1W but don't expect stellar THD at those levels. 🙂 It pimarily designed for headphones and as such it should rarely need to push more than 100mw or so. 🙂
If you used a couple of TO-220 devices, you could tweek the cct to do something like 5W pretty easily, even more if your creative. 🙂
Cheers!
Russ
Hi
if it is primarily designed for headphone use, will it be any good as a line stage with a gain of approx 12-16dB ?
rob
if it is primarily designed for headphone use, will it be any good as a line stage with a gain of approx 12-16dB ?
rob
robmil said:
Absolutely, it makes a great line stage.
The lighter the load the lower the distortion.
Distortion will be very very low at > 1K load.
In fact if you know you will be using it as a preamp/buffer into load > 1K you can use just one of the output device pairs.
Cheers!
Russ
Got my first Diamante up and running and its sounds fantastic. Its driving my HD650 with ease too 🙂 More information to come on BOM and setup.
I still have four boards from the "prototype" run that needs builders.
An externally hosted image should be here but it was not working when we last tested it.
I still have four boards from the "prototype" run that needs builders.
I'm sorry, I didn't answer your mail. Hotmail put it in the trashmail. The price is too steep to me. Since I always want active ground, I'd need 3 boards. Just the boards, pots and connectors would make it an expensive amp. Besides I've just ordered 10 boards for my folded cascode headphone amp, so I'll have too many boards lying around.
I'm glad too hear it turned out to be a great headphone amp. The Head-Fi people are so conservative, and it's always good to see novel ideas.
I'm glad too hear it turned out to be a great headphone amp. The Head-Fi people are so conservative, and it's always good to see novel ideas.
nelsonvandal said:
Too bad, it would have been easier to send the boards withing Sweden. If there is a group buy then the boards will be a lot cheaper.
Hi MrMajestic,
Correct me if I'm wrong, but it seems (from the image above) that you wired right amp psu connection from left amp psu connection. If that is the case, your wiring is wrong, you have to wire each headamp psu connection from the main psu board, otherwise you may have issue with ground loops.
Correct me if I'm wrong, but it seems (from the image above) that you wired right amp psu connection from left amp psu connection. If that is the case, your wiring is wrong, you have to wire each headamp psu connection from the main psu board, otherwise you may have issue with ground loops.
aparatusonitus said:
Well, its wired the same way Russ did his prototype and I dont have a ground loop problem. I dont really see how this wiring scheme would create a ground loop, but maybe you can enlighten me.
You have effectively created unequal voltage drop on ground wires from headamp pcb to main PSU, and whenever you have that, you have current circulating because of voltage differential and wires acting like resistors.
Hi Mr Majestic,
It is better to wire the power to each amplifier direct from the PSU, and not daisy chained as you have it.
If I did it that way at one point it was probably temporary just to test the amp, I would have corrected it in a final installation.
Still what you have done probably would not cause any practical issue.
Great work! Very glad to see it working.
I am also very pleased you like the sound.
Cheers!
Russ
It is better to wire the power to each amplifier direct from the PSU, and not daisy chained as you have it.
If I did it that way at one point it was probably temporary just to test the amp, I would have corrected it in a final installation.
Still what you have done probably would not cause any practical issue.
Great work! Very glad to see it working.
I am also very pleased you like the sound.
Cheers!
Russ
This is not the final setup, so I will wire it differently later. It was just convenient to do it this way. I might go fully balanced with it if no one is interested in the boards. And if no one builds the first boards, there wont be a group buy, at least not initiated by me. So please, step up to build the prototypes 🙂
The four boards I had left have been sold. Hopefully the builders will report in when they are done so we can get a proper group buy going. Many thanks to the guys who stepped up to the plate 🙂
MrMajestic,
I am very pleased things are working out so far. I hope building and setting up the amplifier was straight forward. If you have any tips for users please share them.
Cheers!
Russ
I am very pleased things are working out so far. I hope building and setting up the amplifier was straight forward. If you have any tips for users please share them.
Cheers!
Russ