Hmmm, well that PCB might be much use to anyone else beside you then unless someone knows where to get 10uf film caps that are that small.... I certainly don't, but I wish I did.
Hello russ,
If you say that other members can't get it, I will change the footprint to a larger one, so all guys can have the capacitors they want on the PCB...No problem 🙂
If you say that other members can't get it, I will change the footprint to a larger one, so all guys can have the capacitors they want on the PCB...No problem 🙂
Project
Things seem to be moving quite quickly here. You two have both done a lot of work.
For someone like nyself who has only made up one GC, how difficult would it be to put one of these together? I also tried looking for some of those output trans but could not find any in my country
C heers.
Things seem to be moving quite quickly here. You two have both done a lot of work.
For someone like nyself who has only made up one GC, how difficult would it be to put one of these together? I also tried looking for some of those output trans but could not find any in my country
C heers.
russ,
Ok, no problem, I will change that soon...
enzedone,
Welcome to the LM4702 club, its very easy as you can see, no need to be confused 🙂
Ok, no problem, I will change that soon...
enzedone,
Welcome to the LM4702 club, its very easy as you can see, no need to be confused 🙂
Cheers
I just have to watch my spending. My wife is totally ready to kick me out of the house..🙁
Spending too much money on electronics and not enough time renovating the house....
I am about to buy 2.5 meters of heat sink and the cut it all up. It will cost about $150 NZD all up for about 10x250Ml lengths, so I have to make sure i get the right roject to make.And try not to tell the wife about it..hehe
I just have to watch my spending. My wife is totally ready to kick me out of the house..🙁
Spending too much money on electronics and not enough time renovating the house....
I am about to buy 2.5 meters of heat sink and the cut it all up. It will cost about $150 NZD all up for about 10x250Ml lengths, so I have to make sure i get the right roject to make.And try not to tell the wife about it..hehe
Compare
It would be very interesting to compare something like this project with say, Franz's valve buffered LM3875 and see what the difference is.
It would be very interesting to compare something like this project with say, Franz's valve buffered LM3875 and see what the difference is.
man, i actually found 10uf 16 volt film caps with 5mm lead spacing!
wima caps to boot!!
http://www.elfa.se/elfa-bin/dyndok.pl?lang=no&vat=0&dok=2012650.htm]this[/URL] link should work.
the problem though is thay cost 10bucks a piece..
edit: ok, didnt work.
her's the datasheet for the series though.
edit again, damn the small limit..
we try again
http://www.home.no/demogorgon/06522536-1.pdf
-Marius
wima caps to boot!!
http://www.elfa.se/elfa-bin/dyndok.pl?lang=no&vat=0&dok=2012650.htm]this[/URL] link should work.
the problem though is thay cost 10bucks a piece..
edit: ok, didnt work.
her's the datasheet for the series though.
edit again, damn the small limit..
we try again
http://www.home.no/demogorgon/06522536-1.pdf
-Marius
Vishay caries Polyester film caps in 10uF for around $1 CDN...with the 5mm lead pitch. They are available from Newark.
MKT1817510065
Not sure if these would work or not...but they would fit!
MKT1817510065
Not sure if these would work or not...but they would fit!
demogorgon said:
Hmm my experience with low voltage film caps is that they are poor for audio, but hey I would be willing to try them.
Is 16V enough rating? I guess it would depend on the source. I was going to use 150V parts.
unless you are gonne use the 4702 as a buffer only, a 16V piece would be more than enough..
bad for audio?
would you care to elaborate?
metal, about spacing, i would say it's enough for me a least..
Gcollier, thanks for sharing, maby i can get them from there then.
bad for audio?
would you care to elaborate?
metal, about spacing, i would say it's enough for me a least..
Gcollier, thanks for sharing, maby i can get them from there then.
Hmmm the datasheet from Vishay says only up to 1uf for the MKT1817.
What I mean is that for audio higher voltage caps tend to measure better than lower voltage caps of the same type, but I am not sure its important, its not so important to me in any case.
Ensuring it is the proper voltage rating for the circuit is more important to me.
Here is the datasheet
What I mean is that for audio higher voltage caps tend to measure better than lower voltage caps of the same type, but I am not sure its important, its not so important to me in any case.
Ensuring it is the proper voltage rating for the circuit is more important to me.
Here is the datasheet
Attachments
Looking at the demo board from National it appears they are using 15mm LS parts or so, which would lead me to believe they are 150-200V parts. I wish they would be more specific.
That is, the Cin caps are pretty large in the national demo board, but Ci appear like 5mm parts. So, I would tend to suspect the low volatge caps are just fine there for Ci.
I wonder if the are using a bipolar electrolytic on the demo board for Cin.
I wonder if the are using a bipolar electrolytic on the demo board for Cin.
Hello russ,
That seems to be a demo board to experiment with LM4702, I don't think we should stick to it that much, what do you think..
The last PCB design I have already uploaded with the new capacitors spacings, is just fine, you can easily manage to get capacitors for the input as high as 65Volt, and 150Volt for PS capacitors.
That seems to be a demo board to experiment with LM4702, I don't think we should stick to it that much, what do you think..
The last PCB design I have already uploaded with the new capacitors spacings, is just fine, you can easily manage to get capacitors for the input as high as 65Volt, and 150Volt for PS capacitors.
Metal, I am not one to suggest you should stick exactly to the datasheet by any means, I am just trying to deduce correct rating for certain parts partly based on their size. It is an important fact to get right.
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