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Old 14th April 2007, 04:57 AM   #1
Ayne is offline Ayne  Pakistan
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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.

1st CIRCUIT PREAMPLIFIER
2nd CIRCUIT MICPREAMPLIFIER

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..

Thanks.
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Old 14th April 2007, 09:23 AM   #2
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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.


Colin
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Old 14th April 2007, 10:01 AM   #3
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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
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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.

Thanks.
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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
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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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