QRV06 headamp completed
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digi01

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the main board is completed,I am going to drop it in a tin.thanks P-A,your project is wonderful and crazy


photo attached.

Dr.Zang
 
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ppl

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That is so Cute
 
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MaxW

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Nice one Zang, how does it sound?
 
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peranders

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It looks good Doctor Zang. Remember though that you may be forced to trim the offset.
 
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digi01

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thank you.
I have not powered on it,still need find some parts(small jack and pot and power socket).I will keep on update later.
 
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digi01

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Quote:

Originally Posted by peranders
It looks good Doctor Zang. Remember though that you may be forced to trim the offset.



OK,I know idea


P.S.
I have mail you a high detailed color photo,please help me post it.My site from asia is a bit slow.
 
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peranders

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Quote:

Originally Posted by MaxW
Nice one Zang, how does it sound?


I like this amp strongly, not because I have designed it. It's more like the feeling of the appearance but it has also quite extreme performance despite of the cheap BC transistors. Bandwidth to more than 10 MHz, simulations gives a hint towards 25 MHz.
 
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peranders

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Zang, I have noticed that your homepage is painfully slow. You may consider to move it outside China, if this is allowed. I know your goverment is a bit hard on these issues.

So far no email has turned up.
 
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digi01

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Quote:

Originally Posted by peranders
Bandwidth to more than 10 MHz, simulations gives a hint towards 25 MHz.


P-A,any idea on the C12 choose?
Now It is 200p 0805 packaged caps on the board.I have some 150p silver mica caps handy.I wonder which one is better.
 
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peranders

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C12 should be 47 pF at least with good HF properties. I think NP0 will be fine but please go ahead and test other types. I strongly advice you to have "small" caps, preferable surface mounted so you will minimize all stray inductance. Remember that this design is a 10-20 MHz design.
 
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