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ti5002000

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Posts posted by ti5002000

  1. and now for something completely different part 3

    in Do It Yourself

    Posted

    11 hours ago, Pars said:

    Unclear. Going back in the thread, I had posted this, as the schematics I have don't appear to have this fix in place. Shortly after this post, you released new gerbers including all fixes. However, there was an error with a 10K resistor connecting to a device emitter instead of the base. Not sure whether the fixes mentioned were in only referring to this or also included the servo fix. I don't see a pair of 15K resistors, as were used in the CFA2 fix, on the gerbers.

     

    Sorry @Pars i wasn´t thinking right..What i have is the CFA2...

    My mistake..

  2. and now for something completely different part 3

    in Do It Yourself

    Posted · Edited by ti5002000
    Edit

    6 hours ago, Pars said:

    Does anyone have a pair of CFP3 boards they want to get rid of?

    Also, I see two sets of Gerbers: cfp3rs and cfp3rss. Is the difference the revised servo/current mirror? I'm assuming the cfp3rss is the most recent?

    Thanks!

    Hi @Pars

     

    I think I have some spare boards with the latest version, that has the servo completely out of the audio path, as Kevin said. Tomorrow I let you know. 

    Best 

    Tiago 

    • Like 1

  6. and now for something completely different part 3

    in Do It Yourself

    Posted

    5 hours ago, Pars said:

    ^Probably (respect any pinout differences). I think they are effectively the same transistor/die. The only thing that could potentially be a problem would be cooling. I know the pzta parts were put in because of that (power going beyond the BC capability and the MPSW being discontinued).

    Thanks Pars. 

    I could maybe ,put some heatsink in it ,to avoid heat issues.

    Another question ,if you guys can help. 

    Can i use BC550/560 if i only go up to 22v in the power supply?

  10. goldenreference low voltage power supply

    in Do It Yourself

    Posted

    36 minutes ago, mwl168 said:

    Is it the original, single ended  Dynalo or the SS Dynalo?  And how much voltage drop between the pre-reg and regulated output?

     

    It will be for the ss dynalo and i will be using 22v secondaries transformer.

    35 minutes ago, Pars said:

    You probably should have something on there. Most people seem to mount them to the case bottom. On mine, which is uncased so far, I use a clip on heatsink like this:

    Heatsink-Silver_T.jpg

    yes, i have some small ones more a less the size of those.It´s just, if i can use those, i wouldn´t need to do more holes...

  12. Part Sourcing Assistance/Advice Thread

    in Do It Yourself

    Posted

    28 minutes ago, Pars said:

    I personally like Panasonic... FM or FR. If you want to go semi foo foo, use Elma Silmic II.


    Sent from my iPhone using Tapatalk

    What is semi foo foo in this case Pars? :lol:

    6 minutes ago, jose said:

    I like Nichi KW... but really, you can put anyone

    Yes i know i can use anyone but was just wondering what teh guys thought was best both in musical and technical terms. I was thinking in use nichi ukz.

    Thanks Jose

  16. and now for something completely different part 3

    in Do It Yourself

    Posted

    12 minutes ago, mwl168 said:

    No, take a closer look at the pic I posted; I soldered a 24AWG wire to one of the outer leg of the trimpot then plug the trimpot directly into pin 5 (NC), 6 (out), 7 (V+) of the OP socket and insert the 24AWG wire into pin 4 (V-) of the socket. The socket holds the trimpot tight and it's totally reversible.  

    Understood Thanks!

    9 minutes ago, kevin gilmore said:

    pin 5 on the opamp is not a NC, so if you want to do this and put a jumper from pin 4 to pin 5 on the back of the board cut off pin 5 of the opamp, or bend out of the way.

    the best servo of course is no servo at all as long as everything is stable with temperature

    Yes, i will try this and see what is the result.Thanks

  17. The Multi Amp aka Dynalo Mk2

    in Do It Yourself

    Posted

    15 hours ago, Pars said:


    Those were dual BJTs, not JFETs, that Justin bought. They are the dual version of the 2SA970/2SC2240.


    Sent from my iPhone using Tapatalk

    You´re right.For some reason in my mind i was with the idea that that was jfets...

    19 hours ago, MASantos said:

    Sorry, I have enough jfets for me, but not enough for selling! :) You can buy them on diyaudio.com for about 50 $. 

    yes,but 50$ for that low amount of jfets is what i call expensive ....I know they have to be matched and etc...but still..But i guess that is the price these days.

    Obrigado

    Tiago

  19. The Multi Amp aka Dynalo Mk2

    in Do It Yourself

    Posted

    1 hour ago, MASantos said:

    ti5002000 thank you for your offer, but i prefer to build the smd version with available parts. Building with obsolete parts is risky.

     

    Chris, YGPM.

    No problem. It's not risky if you know the right source.. Justin just bought a pile of new old stock of jfets. Anyway, if you could sell me jfets to replace the that 340 I will be a buyer. If the price is right. But anything pm me. Thanks

  20. The Multi Amp aka Dynalo Mk2

    in Do It Yourself

    Posted

    2 hours ago, MASantos said:

    Hello guys, long time since I posted around here, hope everyone is doing well.  I am looking into the dynalo mk2 for a new headphone amp. I've read around the thread and still have a few doubts.

    1- I've seen some references to a BOM for the Kerry dynalo mini board and also for the"normal" SMD version but couldn't find them anywhere. Could someone point me out where to find them? 

    2- The GRLV seems to be the go to choice for the standard build. It does have some choices regarding output voltage and configuration, but I couldn't find it in the grvl thread.

    3- Has anyone compared the bjt input IC  with matched jfet quad input? I have plenty jfets to use, any parts changes needed to use them instead of the THAT340?

    4- I really like the small for factor of the mini board with all the components in one board. I'll will be driving sennheiser hd650 (6xx actually), would the extra output capability of the "regular" board be an advantage here? I've seen some references of running very warm, should this pose a problem in the long run?

    5- I'll try to ask in the FS forum if anyone has spare boards for sale, if I don't have luck which gerbers should I use to order boards? There are many versions of the GRLV and dynalo mk2.

    Sorry for all the questions I haven't been around much and didn't follow the development closely.

    Hi

    I have a BOM for ssdynalo smd version here that i can get you.

    I also have ssdynalo boards here if you want ,but is the through hole version, but also i have here some through hole mpsw56 and mpsw06 that i can spare if you are interested.

    About the grlv you have the formula to change the output voltage here :

    I also have the schematic and the gerbers if you need it .

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