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Old 21st May 2012, 05:38 PM   #1031
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Default DC offset of Frond End

From the BA manual
"Set P201 to adjust the Drain voltage of Q203 to approximately 0 volts"
Where can we measure in order to set P201 to zero on frond end?


Thanks
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Old 21st May 2012, 06:03 PM   #1032
Itsmee is offline Itsmee  England
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Quote:
Originally Posted by nikosgrgr View Post
Where can we measure in order to set P201 to zero on frond end?
C203, at the junction to R215.
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Old 22nd May 2012, 06:54 PM   #1033
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Originally Posted by Itsmee View Post
C203, at the junction to R215.
Thanks Dear Itsmee.
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Old 28th June 2012, 03:36 PM   #1034
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Default I like it ^5

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Originally Posted by nikosgrgr View Post
Adittional photos
nice layout looks as pro as you can get!
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Old 29th June 2012, 10:59 PM   #1035
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Originally Posted by noSmoking View Post
nice layout looks as pro as you can get!
Thanks for your kind words
Nikos
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Old 30th June 2012, 02:20 AM   #1036
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hi,
If I build this schematics this should work ?
Attached Images
File Type: jpg Front BA-1.jpg (64.4 KB, 263 views)
File Type: gif ba1 out.gif (32.9 KB, 258 views)
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Old 15th July 2012, 05:45 PM   #1037
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Well I've answered it for myself yes it does,lol.
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Old 15th July 2012, 05:53 PM   #1038
Murdoc is offline Murdoc  Germany
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I guess you've read them, but just for reference, if anybody is wondering where to look for those jewels: FIRST WATT ARTICLES
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Old 15th July 2012, 06:03 PM   #1039
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yep , read those too. I was confused because I only had N boards,not N,P so Now I understand you can cascade 2 or more together or use 2 and bridge the outputs.
I had ordered BA-1,and looked at BA-2 also ,
Thanks,
Have a great day the sun is shinenin' in TEXAS
NS
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Old 15th July 2012, 06:16 PM   #1040
Murdoc is offline Murdoc  Germany
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Hi NoSmoking,

one BA-1 output board works as one channel (= 1 mono), if you want stereo, build two. Of cause you can operate them as stated in the F4 article.
As the BA-1 is a single-ended amp, there's no need for complementary devices.
BA-2 is push pull, so you have n-channel and p-channel devices.

Thanks for the wishes, I would be glad if we'll get some sun and warmth here in Germany where I life, but the last days we had so much rain you could get the idea it's already november.
Have a nice day!
Matthias
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