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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Q7 question....
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The Big Ear



Joined: Jul 03, 2005
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Location: belgium

PostPosted: Thu Nov 03, 2005 12:37 pm    Post subject: Q7 question.... Reply with quote  Mark this post and the followings unread

I'm wondering about Q7....
According to the datascheet of a 2N3904 I have to cut pin 1 (collector).
But that would mean the drawing on the PCB is incorrect.
Or am I just being stupid Wink

http://pdf.alldatasheet.com/datasheet-pdf/view/15077/PHILIPS/2N3904.html

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Wild Zebra



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PostPosted: Thu Nov 03, 2005 1:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

Not too sure what you mean about the PCB being wrong. Correct, you cut off the collector. Just socket Q7 try a bunch of 2n3904's til you find the noisiest or the noise you like and then cut off the collector. That simple.
Last edited by Wild Zebra on Thu Nov 03, 2005 1:32 pm; edited 1 time in total
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The Big Ear



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PostPosted: Thu Nov 03, 2005 1:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

[quote="Wild Zebra"]Not too sure what you mean about the PCB being [/quote]

Wondering if the symbol is wrong on the PCB.....
I'll try the socketing thingie...

cheers,

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Uncle Krunkus
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PostPosted: Thu Nov 03, 2005 4:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

On the PCB layout, beneath the Q7 outline you can see a track which is making it's way to R49. But it's not a third pad for Q7. The only two pads under the Q7 outline have a little spot which means they need to be drilled and will have Q7's Base and Emitter soldered there.
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ladislaobiro



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PostPosted: Fri Nov 04, 2005 12:28 am    Post subject: Reply with quote  Mark this post and the followings unread

The Big Ear wrote:
Wondering if the symbol is wrong on the PCB.....

Hi The Big Ear (btw, nice nickname Very Happy), and welcome to electro-music...

No, the simbol on the PCB for Q7 is definitely right.
If you look at the second page of the spec sheet that you've linked, you will find the pinout of the trasistor.
Remember that usually a transistor pinout refers to the transistor seen from the bottom to the top: you have to look the legs' side...
Do this and you will see that the PCB symbol does make sense.
bye...
ladislao
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The Big Ear



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PostPosted: Fri Nov 04, 2005 9:58 am    Post subject: Reply with quote  Mark this post and the followings unread

[quote="ladislaobiro"]
Hi The Big Ear (btw, nice nickname Very Happy), and welcome to electro-music...

No, the simbol on the PCB for Q7 is definitely right.
If you look at the second page of the spec sheet that you've linked, you will find the pinout of the trasistor.
Remember that usually a transistor pinout refers to the transistor seen from the bottom to the top: you have to look the legs' side...
Do this and you will see that the PCB symbol does make sense.
bye...
ladislao[/quote]

Thanks, I see it now, must be the herbs getting in the way Wink

Cheers,

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mosc
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PostPosted: Fri Nov 04, 2005 10:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

Welcome, Big Ear.

I think you have your profile set up not to show BBCODES. That's generally not too useful. That's why your quotes aren't showing up. You can set it using the profile menu at the upper right of any forum page.

Cheers...

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