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Old 12th October 2008, 04:52 AM   #11
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Andrew, thanks for the feedback on the layout.

> DC coupled amp

The amp will be used with a preamp. I'll put in a coupling cap for safety.

> No RF attenuation.

There is an RC filter on the output. I wanted to avoid an inductor.
Others like BrainGT seem to follow the same.

> NFB tied into the Power Ground instead of the Signal Ground.
> Signal Ground sharing trace impedance with Power Ground.

Fixed now.

Decoupling caps are large, as that's what I have at hand now.

- Prasad
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Old 12th October 2008, 10:19 AM   #12
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by quadtech
Andrew, thanks for the feedback on the layout.

> DC coupled amp

The amp will be used with a preamp. I'll put in a coupling cap for safety.

> No RF attenuation.

There is an RC filter on the output. I wanted to avoid an inductor.
Others like BrainGT seem to follow the same.
adding one DC blocking cap leaves the amp with mixed AC & DC coupling.
I recommend you AC couple
or
DC couple with DC detect and output isolation.

There is no input RF attenuation. Fix it.
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regards Andrew T.
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Old 22nd October 2008, 12:14 PM   #13
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I have now etched my first board

Click the image to open in full size.

The second one didn't work out that well, so I will redo I on monday.
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Old 22nd October 2008, 12:57 PM   #14
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You seem to have etching worked out.
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Old 22nd October 2008, 07:27 PM   #15
danbli is offline danbli  Sweden
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Default Another Swedish DIY'er here

Hello!

Daniel sweden here!

I am new to the forum so I cant send Emails with it yet but could you please send me a mail at danielblixt(a)yahoo.se

/Daniel
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Old 22nd October 2008, 07:31 PM   #16
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Yes I can
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Old 22nd October 2008, 08:15 PM   #17
ratza is offline ratza  Romania
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How did you make the PCB, photo or press and peel?
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Old 22nd October 2008, 08:22 PM   #18
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I printed the layout on a paper called laserstar.
Then I had uv-light, then NaOh, then etching...

I don't know what the method is called
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Old 24th October 2008, 06:45 AM   #19
ratza is offline ratza  Romania
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That's photo
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Old 21st November 2008, 03:28 PM   #20
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Click the image to open in full size.

Two boards etched and the chips are mounted! Next thing to do is to order the components
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