What do you think about my design (based on IMPAMP)

jtrujillo · 29th June 2006, 04:08 PM

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:

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!

SY · 29th June 2006, 04:35 PM

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?

jtrujillo · 29th June 2006, 04:58 PM

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.

SY · 29th June 2006, 05:52 PM

You can upload a jpeg here directly. Use the "Attach File" option.

Netlist · 29th June 2006, 06:04 PM

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

jtrujillo · 29th June 2006, 10:50 PM

So what do you think about the circuit?

29th June 2006, 04:08 PM	#1
jtrujillo diyAudio Member Join Date: Jun 2006	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: 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!

29th June 2006, 04:35 PM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	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? __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

29th June 2006, 05:52 PM	#4
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	You can upload a jpeg here directly. Use the "Attach File" option. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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29th June 2006, 04:58 PM	#3
jtrujillo diyAudio Member Join Date: Jun 2006	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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