|
|||||||
| Home | Forums | Rules | Articles | Store | Gallery | Blogs | Register | Donations | FAQ | Calendar | Search | Today's Posts | Mark Forums Read | Search |
| Chip Amps Amplifiers based on integrated circuits |
  |
|
|
|
Please consider donating to help us continue to serve you.
Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving |
 |
|
|
Thread Tools | Search this Thread |
22nd January 2013, 06:58 AM
|
#71 |
|
diyAudio Moderator
Join Date: Sep 2007
|
The input impedance is one area where my solution failed too.
If the input impedance in the pass band remains the same as the original then that suggests we should be able to add a 5.9K in series with the source voltage and that the output voltage will reduce by 50% without affecting the response.
__________________
------------------------------------------------------- A simulation free zone. Design it, build it, test it. |
|
22nd January 2013, 08:54 AM
|
#72 |
|
diyAudio Member
|
By the way did any of you read Castor-Perry's article in Linear Audio?
jan
__________________
/Yes! Its out: Linear Audio Vol 5! I'm not an "accademic", just a plodder who loves a challenge - Ian Hegglun |
|
22nd January 2013, 10:52 AM
|
#73 | |
|
diyAudio Moderator
Join Date: Sep 2007
|
Quote:
__________________
------------------------------------------------------- A simulation free zone. Design it, build it, test it. |
|
|
23rd January 2013, 01:09 AM
|
#76 |
|
diyAudio Member
Join Date: Mar 2010
|
sidiy:
I mounted breadboard the two options ("standard" and "modified") and measured input impedance in both circuits above 10 KHz. There may be slight discrepancies in the readings but I do not see major differences. regards jan.didden: I'll look for that article. Looks interesting. Clarified that is not what I'm using. Thank you very much for the information. regards 
|
|
23rd January 2013, 01:44 AM
|
#77 |
|
diyAudio Member
Join Date: Mar 2010
|
astx:
Those were the two best approximations, until now. Give me some time to analyze them in detail. I do not see these nonlinearities, as I said occurs in other case. I have doubts on the input impedance. I think it's 2K4. As you can see, I use another variant. The blue curve corresponds to what You have kindly uploaded. regards 
Last edited by diegomj1973; 23rd January 2013 at 02:01 AM. |
|
23rd January 2013, 07:18 AM
|
#79 |
|
diyAudio Member
Join Date: Jan 2011
Location: Tyrol / Austria
|
Ad post #75 and #77:
IMHO the blue curve seems to be more linear - standard differential amplifier seems to be the better circuit. The input impedance ist indeed 2.4k Also with matched resistors the CMRR will be very good. |
|
23rd January 2013, 01:23 PM
|
#80 |
|
diyAudio Member
Join Date: Mar 2010
|
Mooly:
Yes. These were measured on a real case. regards astx: The blue curve is more linear than red (no doubt). However, in real cases, this nonlinearity does not exceed 0.1 dB. Believe me it is so. The main intention in my connection is: Given a common connection, have the possibility to relocate its components, maintaining its current parameters and improve only the low-frequency response (without prejudice to the other parameters). This would allow us to implement it in all that exists, relocating connections only. While what you have is very interesting, would have to find a way to keep the same input impedance (or something very similar). regards |
|
| Thread Tools | Search this Thread |
|
|
Similar Threads
|
||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| Here's a challenge.... | Meshuganah | Solid State | 42 | 16th November 2011 01:59 AM |
| Here is a Challenge | latala | Solid State | 41 | 12th May 2011 01:13 AM |
| Single supply opamp - unequal rail voltage and opamp selection | Hans L | Parts | 8 | 19th February 2006 02:15 PM |
| a challenge --or I need help | lawrence99 | Car Audio | 0 | 9th March 2005 04:44 AM |
| The challenge ! | thylantyr | Solid State | 51 | 24th July 2003 08:41 PM |
| New To Site? | Need Help? |
