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Some LME49600 implementations - Page 17

post #241 of 291

So I bypass protection, and have music! Letting the servo stabilize, I have 0mV for offset on both signal lines. (much) more listening to follow but woohoo! Thanks wakibaki for making this possible. It would be nice to 'fix' the protection. Any thoughts?

post #242 of 291
Thread Starter 

Did you orient the cap on the protection circuit as per the written note included in the package?

 

w

post #243 of 291
Quote:
Originally Posted by wakibaki View Post

Thanks fzman. Good to hear you are recuperating. I'm back to what passes for normal for me.

 

I have built up one of the new boards, it works fine, hum has been eliminated. I'll post some measurements soon.

 

I wrote a query via the feedback form inquiring about selling boards, but I haven't had a reply. Does anybody know how this works?

 

Boards will be £5 flat rate (5 Pounds UK) including worldwide P & P (and Paypal charges). This is ~$7.85 US at current exchange rates. If you send me a PM I will send you a paypal invoice, but please wait until I confirm that I am have fulfilled any forum requirements. There are 10 available in this batch.

 

w

 

No problem doing these at cost.  I just built a Japanese amp using the LME49600 and the results have been good.

 

I suggest starting up a Google Docs spreadsheet. It also has a form building option so people can add themselves. That might make it easier for you to keep track. I used this system for a group buy. I'd suggest though that you pass on your contact details and make it possible for someone to contact us if, for example, you have to go into hospital suddenly or have some other kind of emergency. That's happened in the past and caused all sorts of drama.

post #244 of 291

Congrats misterrogers, let us know how it sounds

 

Quote:
Originally Posted by Currawong View Post

 

No problem doing these at cost.  I just built a Japanese amp using the LME49600 and the results have been good.

 

I suggest starting up a Google Docs spreadsheet. It also has a form building option so people can add themselves. That might make it easier for you to keep track. I used this system for a group buy. I'd suggest though that you pass on your contact details and make it possible for someone to contact us if, for example, you have to go into hospital suddenly or have some other kind of emergency. That's happened in the past and caused all sorts of drama.

 

What Japanese LME49600 amp is this? Cheers

post #245 of 291

yep, thanks w - I did (reversed polarity on C27). J-Pak - sounds very good! Just now giving it a good listen.I definitely think you should do a run of this amp. The tight smd may be a bit tough for some, but it isn't too hard or expensive, and performs well.

post #246 of 291
Quote:
Originally Posted by wakibaki View Post

 

Boards will be £5 flat rate (5 Pounds UK) including worldwide P & P (and Paypal charges). This is ~$7.85 US at current exchange rates. If you send me a PM I will send you a paypal invoice, but please wait until I confirm that I am have fulfilled any forum requirements. There are 10 available in this batch.

 

 

I'm in - PM sent for the invoice. smile.gif  I just discovered this thread.  I've built a couple of the OPC "Wire" amps, will be fun to compare.  Looks like you developed a good solution to that broken DC servo design on the National design.  I hand built that design a couple of years ago and discovered the defective servo (fairly high output offset).  I tried LTSpicing it at the time and the sim results pretty much matched up with the real world results - broken servo design.

post #247 of 291

Geez...I should have noticed that...I had my C27 in backwards too.

Now my protection works too.

 

That's why we prototype...

post #248 of 291

I want to figure out why mine isn't energizing the relay. It'd be nice to remove the jump. I've got to take a closer look at Q3 - I may have it flipped.

post #249 of 291
Thread Starter 
Quote:
Originally Posted by Avro_Arrow View Post

Geez...I should have noticed that...I had my C27 in backwards too.

Now my protection works too.

 

That's why we prototype...

 

Sorry about that Avro-Arrow, I should have made it more widely known. Oddly my first build worked OK with the cap reversed??? This is not a serious issue, you just have to be aware that the polarity indication on that particular cap is reversed, even on the most recent board. I will fix this in future if the demand for boards exceeds those currently available.

 

w

post #250 of 291
Thread Starter 
Quote:
Originally Posted by Misterrogers View Post

I want to figure out why mine isn't energizing the relay. It'd be nice to remove the jump. I've got to take a closer look at Q3 - I may have it flipped.

 

Of course. I'm sure we can get to the bottom of it. Presuming that Q3 is correctly placed, have a look for any solder strings on the associated comparator U10. It's unlikely that you've got Q3 incorrectly placed, it requires quite an effort to get it that way on the earlier boards. The junction of R20 and R41 should be sufficiently above (>=0.6V) the negative rail (the tab on U11) to turn on the transistor. Be aware that there are 2 negative rails, one for each LME49600. The one you are interested in is the one closest to U10.

 

w

post #251 of 291

Listing to 'Smokin' while working today; I really think you've got something here. I don't know if it's 'brain train' or burn in, but at about 3 - 4 hours I noticed an increase in sound stage and dynamics. Very nice little amp. Also of note; it's absolutely silent. Even when cranked all the way up, not a peep. The stock build/BOM has plenty of gain for my HE-5 too.

post #252 of 291
Thread Starter 

agdr asked me for a more detailed picture of the schematic, I'm going to post a .jpg made from a 600dpi bitmap here, I won't know how successful it's been until I see it on the forum, however

 

 

 

Unfortunately it doesn't seem to work, I will send a copy to anyone who needs it if they PM me an email address...

 

w


Edited by wakibaki - 9/22/12 at 8:38pm
post #253 of 291

I suggest getting a Dropbox account (very handy for backing up important files) as it can create a URL for any file inside for sharing. Then you can post the url for the file here. smile.gif

post #254 of 291
Thread Starter 

Thanks Currawong, I'll do something about that this afternoon.

 

w

post #255 of 291
Thread Starter 

Here's the dropbox link to the high-res .jpg of the schematic.

 

https://dl.dropbox.com/u/107775480/d56233_10x10_1.jpg

 

w

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