Someone mentioned a board with the psu on it, i have been trying a board like that before and maybee i'll try to finish it now when my other board(with the alps) is on it's way.
What do you think about it so far? the grounds are missing and to the left it's supposed to be something like eight MUR220 diodes and a RC (like 15ohms + 1200uF) almost like this schematics with out that last 1200uF (thats taken care by the 220uF near the OPA/BUF
Regards
What do you think about it so far? the grounds are missing and to the left it's supposed to be something like eight MUR220 diodes and a RC (like 15ohms + 1200uF) almost like this schematics with out that last 1200uF (thats taken care by the 220uF near the OPA/BUF
An externally hosted image should be here but it was not working when we last tested it.
Regards
I wonder if there is a way to make the SMD optional, What I mean is either SMD or through hole. Maybe another set of pads?
Yep, that cap could be right next to the OPA. Righthand side!
That board looks pretty cool, Tobias. The BW resistor would also be a nice option, for the ppl with Mdip's.
Steen.😎
Russ White, I have got to give it to you, you are on a roll😀
I am impressed by your postings🙂 You act like an experienced guy, allready🙂 I guess we will all benefit from you, over time😉
Steen😎
BTW, normally I do not adress ppl. in this direct fasion, but in your case, I obviously made an exception🙂
I am impressed by your postings🙂 You act like an experienced guy, allready🙂 I guess we will all benefit from you, over time😉
Steen😎
BTW, normally I do not adress ppl. in this direct fasion, but in your case, I obviously made an exception🙂
Thanks Steeno, that honestly means a lot coming from you. I think I have learned a lot the last few months thanks to guys like you. 
🙂
Still, I know I have much more to learn.
🙂Still, I know I have much more to learn.
You prefer the sound of the BOSOZ with headphones? What type of headphone are you using?steenoe said:
p.s. Count me in for the group buy (PCB Only).
Yep, thats the way!, we all have much more to learn 😉
Now to something else, regarding the PSU for this preamp. I do not necessarily think its a good idea to have the regulated supply as part of the mainboard! It would all be a bit more usefull, if it was on a separate board. Scored and attached to the mainboard in the production run🙂 You could let it sit, or separate it if you want to! Also, I know this is a Chipamp-forum, but something like Alcaid's psu holds the edge: http://www.diyaudio.com/forums/showthread.php?s=&threadid=33191&highlight= I know, I said it before, but nonetheless😉
Steen.😎
steenoe said:
Yes, I agree. I stated something like that a while back. There are so many options for creating perfectly suitable power supplies for a circuit like this. Including 2 simple batteries. 😀 That is why I am leaning towards n00bers design right now as it is really very simple. GColliers design also has some very good qualities, I am not sure I think C1 and C2 should be there though. I think those should be at the PS. I can't wait to see what these guys do next. 🙂😎
Also I am not sure a PS is required for the GB at all as it is quite easy to create one on protoboard. But, I can see that it would still be a good thing as it would be quite convienient. It may make the GB more popular and likely to succeed.
Hello again, well the SMD under the OPA was just an option i did for myself if i could find a good quality SMD cap. otherwise I just solder it directly on the socketpins. but ofcourse a cap on the side is no problem.
As for the BW resistor, I will never use it and it's kinda hard to make it good i'll have to figure it out because as it is right now it isn't optimal on that location either as i said to n00ber, when you don't have a resistor like i have you will power the BW pin "first" and the V- "after", so i think it's a compromise already.
And the grounds, that's hard to. Groundplane/Two Groundplane with a single connection/Starground.
I want a starground (on the other layer, this is supposed to be a 2 layer board) but it's holes everywere so the starground traces is kinda hard to route.
Suggestions please 🙂
As for the BW resistor, I will never use it and it's kinda hard to make it good i'll have to figure it out because as it is right now it isn't optimal on that location either as i said to n00ber, when you don't have a resistor like i have you will power the BW pin "first" and the V- "after", so i think it's a compromise already.
And the grounds, that's hard to. Groundplane/Two Groundplane with a single connection/Starground.
I want a starground (on the other layer, this is supposed to be a 2 layer board) but it's holes everywere so the starground traces is kinda hard to route.
Suggestions please 🙂
Nope, I didnt excactly say that!!! The BosoZ is no headphone amp
The OPA624/BUF634 can be just that, if you want to🙂 It sounds pretty good as that, too🙂 Just trim the resistors as outlined in previous post. Take a look at my chip preamp, with everything implemented:http://www.diyaudio.com/forums/showthread.php?s=&threadid=55558&highlight=
I have a pair of Beyerdynamics DT880's. The BosoZ sounds better on my speakers too, which happen to be a pair of ProAc 2.95 clones, at the moment.
Steen😎
As for the separate boards steenoe, on monday my boards that i did are coming hope it will work 🙂
PSU looks like this and i'm going for 1 per channel.
Boards are coming from olimex were i was able to fit in some boards to their prototype boards 100x160mm
Panelized
I showed the board with the regs. on it because someone wanted something like that or maybee i read it wrong.
PSU looks like this and i'm going for 1 per channel.
Boards are coming from olimex were i was able to fit in some boards to their prototype boards 100x160mm
Panelized
I showed the board with the regs. on it because someone wanted something like that or maybee i read it wrong.
tobias_svensk said:
Actually Tobias, I like it a lot
.What I am wondering though is which version will have the broadest appeal/ approval.
I am actually starting to think multiple GBs may be in order. 🙂
I can't wait to see your completed boards. I have been a fan since you first showed your design. 😎
Tobias, thats a great panelized board😀 I guess you had "Bucks for the $" 😀 I see a couple of Cmoy's in there too, great move!
Nice pic of the PSU board, too. What are the reg's LM317's and 337's? You guy's really did do a great job with this preamp!
N00ber, Gcollier, and you Tobias, the designs are all great🙂
I am in for some of those boards, whatever design is chosen🙂
Steen😎
Nice pic of the PSU board, too. What are the reg's LM317's and 337's? You guy's really did do a great job with this preamp!
N00ber, Gcollier, and you Tobias, the designs are all great🙂
I am in for some of those boards, whatever design is chosen🙂
Steen😎
tobias_svensk said:
Personally, I like the idea of there being a star ground point on the board. I don't really care if its one layer or two, except that one layer boards will be cheaper. I like the later development with n00ber's design where the ground planes are seperate but joinable with a jumper, a resistor, or off board at the PS.
I actually think the version you have in the Panel is quite nice. I would opt for something like that but removing the pot, and adding a place for the feedback cap as well as trying to figure out a way to add the BW resistor.
Yours and N00ber's designs are quite similar.
Thanks for the hard work.
I can tell you I am so itching to order these boards. As soon as there is some concensus on a design i will do so.
I, for one am confident, that a nice LM317/337 reg would be really appealing🙂 I guess I would order a few extra's of those for other project's🙂 Flexibility is the word, guys🙂 Still, take a look at post #589, I really like that supply. Pass transistors really takes care of supply noice, and the zener value is easily adjusted!! Take a look at my Alcaid boards:
http://www.diyaudio.com/forums/showthread.php?postid=655266#post655266
Steen.🙂
At 99 x 57 I wonder how hard it would be to integrate that with any of designs we are looking at here.
In any case steeno I have found my project for the weekend. I am going to try to build one of those on protoboard. 🙂
In any case steeno I have found my project for the weekend.
I am going to try to build one of those on protoboard. 🙂
Steeno, those are mighty pretty boards. What an awesome etching job, and the legend is an added elegance. 😎
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