Me too, and since it's such a generous gift to the DIY community at large I'm willing to wait patiently. 🙂
The Panasonic ECA-1HM102B called for in the Cedarburg Detailed Parts List, is "only" 25mm (1 inch) long. On my boards the top of the cap is only 8mm higher than the top of the TO220 metal flange with bolt hole.
I figured he had those, and they met the diameter needed. Mine are the 25mm tall ones too. I was afraid to go out of spec for this board.
M2X-Cedarburg
Yep,
Cedarburg sounds really great.
The first impression is very detailed and 'accurate'.
I understand why the AD797 is suggested for preamps; microphone preamps,...
Chet Baker was breathing and pressing the air into his trumpet....
Kinga Glyk played the bass and you could hear her striking the strings and how they sustained - long and clear.
Very good show!
But also with rock music I had fun.
Dirk
Yep,
Cedarburg sounds really great.
The first impression is very detailed and 'accurate'.
I understand why the AD797 is suggested for preamps; microphone preamps,...
Chet Baker was breathing and pressing the air into his trumpet....
Kinga Glyk played the bass and you could hear her striking the strings and how they sustained - long and clear.
Very good show!
But also with rock music I had fun.
Dirk
I'm going for the forum record for having daughter boards built before I get the mains. 😉
My impression:
We can tell all of this to a tree ...
.. always new accessories for a product that cannot be purchased
... running...
We can tell all of this to a tree ...
.. always new accessories for a product that cannot be purchased
... running...
While you wait you can do nothing or you can do something else. One possibility is to build a headphone amp.
Just so everyone knows I was just having a little fun. I have no problem waiting for boards and very much appreciate all the work that went into bringing them to the forum.
🙂
Regards,
Dan
There is also a fair amount of work with PSU, and case work. Switch, switch circuits, soft starts... I don’t have start up, or shut down thumps with M2x, like I do with my Aleph J.
Please evaluate the sound of new M2x circuitry
I'm seeking volunteers to help me perform listening auditions / evaluations of new M2x daughter card configurations.
The listening tests will use the IPS7 circuit board, plus a cadre of unusual opamps that are seldom/never deployed in M2x's ... because they're surface mount parts (SOIC-8). However, I've soldered the opamp chips on SOIC-to-DIP adapters for these experiments, so they function as DIP-8s and thus are 100% compatible with IPS7 boards.
None of the opamps used in these tests are unknown or mysterious; every one of them is available worldwide, and their excellent datasheet specifications are published globally. Despite this, nobody has tried ANY of them in an M2x amplifier as far as I can tell, either with a Tucson or an IPS7 or anything else. I searched this thread for each of the part numbers and came up empty, every time.
So, I'd like to get the evaluations and critiques and opinions and listening evaluations of other M2x owners, and find out if one or more of these chips give terrific sound for YOU. As the designer and experiment-creator, I might fall victim to "Proud Parent bias", but YOU probably don't. So your opinions and evaluations are probably less biased (more objective) than mine.
IF YOU'RE INTERESTED
Please PM me if, and only if, you can truthfully promise that you'll evaluate two different opamp types, in your IPS7 boards, in your M2x, within four weeks of receiving the chips. And then write up your impressions and evaluation results as a post in this thread. (Slowpokes are undoubtedly wonderful human beings, but they're not my first choice for this experiment.)
Hopefully you'll discover a hidden gem, and your findings will help steer other M2x owners toward a new avenue for great sound using the IPS7 board. Then everybody will benefit from your experiences.
I'm not going to say anything specific about the chips which are (or are not!) part of the experiment. I don't want to prejudice the listeners or to pre-bias their opinions.
Naturally the opamps and adapters will be yours to keep after the evaluation is complete.
Thanks for reading this!
I'm seeking volunteers to help me perform listening auditions / evaluations of new M2x daughter card configurations.
The listening tests will use the IPS7 circuit board, plus a cadre of unusual opamps that are seldom/never deployed in M2x's ... because they're surface mount parts (SOIC-8). However, I've soldered the opamp chips on SOIC-to-DIP adapters for these experiments, so they function as DIP-8s and thus are 100% compatible with IPS7 boards.
None of the opamps used in these tests are unknown or mysterious; every one of them is available worldwide, and their excellent datasheet specifications are published globally. Despite this, nobody has tried ANY of them in an M2x amplifier as far as I can tell, either with a Tucson or an IPS7 or anything else. I searched this thread for each of the part numbers and came up empty, every time.
So, I'd like to get the evaluations and critiques and opinions and listening evaluations of other M2x owners, and find out if one or more of these chips give terrific sound for YOU. As the designer and experiment-creator, I might fall victim to "Proud Parent bias", but YOU probably don't. So your opinions and evaluations are probably less biased (more objective) than mine.
IF YOU'RE INTERESTED
Please PM me if, and only if, you can truthfully promise that you'll evaluate two different opamp types, in your IPS7 boards, in your M2x, within four weeks of receiving the chips. And then write up your impressions and evaluation results as a post in this thread. (Slowpokes are undoubtedly wonderful human beings, but they're not my first choice for this experiment.)
Hopefully you'll discover a hidden gem, and your findings will help steer other M2x owners toward a new avenue for great sound using the IPS7 board. Then everybody will benefit from your experiences.
I'm not going to say anything specific about the chips which are (or are not!) part of the experiment. I don't want to prejudice the listeners or to pre-bias their opinions.
Naturally the opamps and adapters will be yours to keep after the evaluation is complete.
Thanks for reading this!
The search engine didn't turn up too much.
More info on CCOMP?
Some OPAMPs require it, some don't?
I'm populating my IP7 with an OPA134PA for starters.
Regards,
Dan 🙂
More info on CCOMP?
Some OPAMPs require it, some don't?
I'm populating my IP7 with an OPA134PA for starters.
Regards,
Dan 🙂
The schematic notation "DNS" means Do Not Stuff (or equivalently Do Not Solder). CCOMP DNS does not appear in the Detailed Parts List because it does not appear on a finished IPS7 board.
However,
there is one IPS7 builder who wanted to populate it with a certain specific (favorite?) Single opamp (one amplifier per DIP8). That opamp requires an external compensation capacitor between pins 5 and 8, to guarantee stability in unity gain applications like IPS7. As an accomodation & favor to this one IPS7 builder, I created a spot on the PCB where s/he could put this capacitor.
And in fact, anybody who wants to connect any two terminal electronic component between pins 5 and 8 of a Single opamp, for any possible reason, is able to do so. The footprint is on the PCB and the silkscreen is clearly marked. Please accept my invitation to do whatever you like, on boards that you own. I haven't seen any photos of IPS7 PCBs in this thread, which did include a component there, but maybe I missed one or two.
Click on the image to see it full size and undistorted.
_
However,
there is one IPS7 builder who wanted to populate it with a certain specific (favorite?) Single opamp (one amplifier per DIP8). That opamp requires an external compensation capacitor between pins 5 and 8, to guarantee stability in unity gain applications like IPS7. As an accomodation & favor to this one IPS7 builder, I created a spot on the PCB where s/he could put this capacitor.
And in fact, anybody who wants to connect any two terminal electronic component between pins 5 and 8 of a Single opamp, for any possible reason, is able to do so. The footprint is on the PCB and the silkscreen is clearly marked. Please accept my invitation to do whatever you like, on boards that you own. I haven't seen any photos of IPS7 PCBs in this thread, which did include a component there, but maybe I missed one or two.
Click on the image to see it full size and undistorted.
_
Keep in mind I'm no EE. A quote from the OPA134 datasheet seems to suggest that I won't need CCOMP.
But I also see in post #1328 that the Norwood board needs CCOMP when used with the AD744.
Regards,
Dan
But I also see in post #1328 that the Norwood board needs CCOMP when used with the AD744.
Regards,
Dan
I am using OPA134 in IPS#7 right now. There is nothing in CCOMP and it sounds great. When I first evaluated IPS#6&7 I leaned toward IPS#6 but over time I have changed my mind and prefer#7 with OPA134.
Waiting on the diy store for boards
The build has gone as far as it can go. Waiting on boards for the M2x , which are sold out. The build was inspired by a review at 6moons audio reviews: FirstWatt M2 .
The fact that I can change the input buffer and compare notes with fellow builders is the icing on the cake.
The build has gone as far as it can go. Waiting on boards for the M2x , which are sold out. The build was inspired by a review at 6moons audio reviews: FirstWatt M2 .
The fact that I can change the input buffer and compare notes with fellow builders is the icing on the cake.
