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Please be positive and constructive with your questions and comments.

Q10, Q9, Q8

by analogaddict on Wed Jul 17, 2013 2:28 pm

HI all, I'm new on this forum.
I'm a x0xb0x owner, I bought it some years ago on ebay. It's the standard version and I think it was build using original kit sold from ladyada site. I'm not goog into electric components and stuff, but i want to try to mod a little bit it to have a better clone.

I noticed all the components I found are the same as ladyada says into BOM, except 2SC2291 and 2SC1583. They have minor difference I think. In the picture I saw C229143F and mine is C229142G while the other C158342G is C158397G.

The Q10, Q9 and Q8 are 2SA733P.

My question is : If I found 3 x 2SA733AP and place them in the right place, will I hear a real difference in sound? and which will be the improvement?

There's someone who can sell them?

Tnx a lot :)
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Re: Q10, Q9, Q8

by antto on Wed Jul 17, 2013 2:51 pm

according to my tests, it won't make a difference for Q8

Q10 and Q9 are responsible for coupling the control voltages for the VCF frequency (cutoff/envmod/accent)
..so depending on their hFE value - the final cutoff frequency could become higher or lower, but you can always compensate that with the TM3 trimpot
We are here too: irc.freenode.net >>> #x0xb0x
..:: c0nb0x v1.00 ::.. http://forums.adafruit.com/viewtopic.php?f=7&t=29282 (new control app - win/osx)
VCO Tuning: http://forums.adafruit.com/viewtopic.php?f=12&t=24759 (do it the EASY way)

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Re: Q10, Q9, Q8

by analogaddict on Tue Jul 23, 2013 2:33 pm

Someone knows what does mean that my transistor like 2SC1583 is 97G instead of 42G.

I know G and F are the HFi, but I don't know about the numbers before?
I'm thinging to replace with the right one if that make sense. I should order I new Atmega from xoxbox.de so I thinking to order some other parts like 2SC1583 and this 2SC2291
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Re: Q10, Q9, Q8

by MMM on Tue Jul 23, 2013 4:35 pm

analogaddict wrote:Someone knows what does mean that my transistor like 2SC1583 is 97G instead of 42G.


This number denotes the production charge or sub-charge.
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Re: Q10, Q9, Q8

by analogaddict on Wed Jul 24, 2013 4:31 am

So that mean they are different in some fisic way? can you explain me what does it mean "production charge" ? :)
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Re: Q10, Q9, Q8

by MMM on Thu Jul 25, 2013 3:50 pm

analogaddict wrote:So that mean they are different in some fisic way? can you explain me what does it mean "production charge" ? :)


They shouldn't be physically different. Think of it as a simplified production date.

If I'm not mistaken many semiconductors are not produced continually but in "batches". This is then the marking for one of those "batches".
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Re: Q10, Q9, Q8

by analogaddict on Fri Jul 26, 2013 10:47 am

tnx :)
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Please be positive and constructive with your questions and comments.