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Old 14th April 2007, 04:57 AM   #1
Ayne is offline Ayne  Pakistan
diyAudio Member
Join Date: Apr 2007
Default Going to Design (Preamplifier PCB).

After searching enough, i found this
Preamplifier Circuit Page

Then i make them in simulator..
Click the image to open in full size.

Click the image to open in full size.


In simulation their result is enough satisfactory..
But i use TL072 and i have listen that TL07X series is not good enough now a days.
What u suggest, Best OPAMP, Infact i want to connect this Preamplifier with Computer output..

OPAMP Should be dual(two OPAMP in single chip)..
I am asking best OPAMP here because, many expert members are here and i think they have dealed with enough OPAMPs. I want to take advantage from their experience...

I also request to expert members that put ur views about this Preamplifier over here..

After ur Responce i will make PCB of above both circuits..

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Old 14th April 2007, 09:23 AM   #2
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Join Date: Mar 2006
Location: Vancouver, BC,Canada
It depends what you are looking for,k best sonics or something that serves its function. The BB opa2134 is a good dual chip, op275, or opa2604. My personal fave which is unsurpassed by any single op amp is the Jung Composite Op Amp or the diamond buffer with a fet input op amp. With some careful choices you can put yourself in a position to be able to eliminate output coupling caps and caps between preamp stages.

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Old 14th April 2007, 10:01 AM   #3
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Location: Warsaw
I do not like the mic section, you will have to use huge electrolytic capacitors and PSRR will be poor.
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Old 16th April 2007, 01:41 PM   #4
Ayne is offline Ayne  Pakistan
diyAudio Member
Join Date: Apr 2007
Question Some Questions

Q no 1:- why we listen a sound when we put mic infront of speaker????

Can we minimize that sound.

Q no 2:- What is PSRR???

Please explain above both questions in detial.

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Old 16th April 2007, 01:55 PM   #5
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1., the system is "festering"
2., PSSR = power supply rejection ratio
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Old 16th April 2007, 02:19 PM   #6
Ayne is offline Ayne  Pakistan
diyAudio Member
Join Date: Apr 2007
Thanks sixtek.

But i googling with "festering" and found nothing related to Sound and Mic..

Plz can u explain in more detial???
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