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Old 29th June 2006, 04:08 PM   #1
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Default What do you think about my design (based on IMPAMP)

Hello!, this is my first thread on this forum. I'm from Spain so I apollogize for my english. Also I'm a totally newbie in hi-fi.
I wanted to build a little project to introduce myself in hi-fi and I saw the IMPAMP www.impamp.com which has been discussed previously in this forum.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=72699&highlight=impamp

This is my design:

Click the image to open in full size.

I thought that the 12AU7 could be a good choice but I've seen similar designs with 6SN7 o 12BH7. I simulated it in LTSpice and the 12AU7 gives me the best THD specs (I don't know how much accurate these spice models are).

Saludos!
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Old 29th June 2006, 04:35 PM   #2
SY is offline SY  United States
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Warning: the linked pic carries spyware and scumware!

In any case, don't trust simulations when it comes to distortion. 6SN7 will give much less distortion than 12AU7.

edit: do you really need that much gain?
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Old 29th June 2006, 04:58 PM   #3
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Sorry for the pic I thoght that imageshack was clean, where can I place the picture for more safety?

About the gain on the op amps it is adjusted to give the maximum output with a portable mp3 player, I have other adjusts for +4db input.
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Old 29th June 2006, 05:52 PM   #4
SY is offline SY  United States
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You can upload a jpeg here directly. Use the "Attach File" option.
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Old 29th June 2006, 06:04 PM   #5
Netlist is offline Netlist  Belgium
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Quote:
Originally posted by jtrujillo
I thoght that imageshack was clean
I believe you are correct. It's their advertising banners and links they don't care much about.

/Hugo
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Old 29th June 2006, 10:50 PM   #6
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So what do you think about the circuit?
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