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Old 10th April 2007, 06:54 AM   #1
jaya000 is offline jaya000  India
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Default suggest preamplifier circuit

I want to make one preamplifier with gain 5~10. The supply voltage is 12v. Input will from a cd player. This is required because the amp to be used hv very low sensitivity. High quality circuit will be prefered.
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Old 10th April 2007, 08:14 AM   #2
AndrewT is online now AndrewT  Scotland
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Hi,
discrete or opamp?
volume control or fixed gain?

BTW,
5 to 10 times is a lot of gain.
The average signal from a CD player is about 200mV.
Multiply that by 5 and you are sending 1V (average) to the power amp. That is going to get pretty close to maximum output.
The peak signal (ac) from the CD player is usually 2Vac (3Vpk) and now your input to the power amp is going to be 10 to 20Vac. Surely that is overload condition.

Finally, you cannot get 5 to 10 times a CD signal from +12Vdc supply. One would need about +-30Vdc supply or +60Vdc supply.
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Old 10th April 2007, 09:27 AM   #3
thanh is offline thanh  Viet Nam
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I think that there are so many pre-amp schematic on internet. I myself can also design a circuit
I'm noticing this http://waltjung.org/PDFs/WTnT_Op_Amp_Audio_4.pdf

I'm not know how to optimize pre-amp for mysefl purpose

A discrete pre-amp. It seem to be a best pre-amp
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Old 10th April 2007, 10:43 AM   #4
Nordic is offline Nordic  South Africa
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Please search for pedja rodgic buffer in this thread... I have tried a bunch of the diy pre's and this is my favourite, also very easy to breadboard, and very cheap.... only a few cheap tranistors and a few caps... but it is almost blameless in quality... very fond of mine
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Old 11th April 2007, 08:50 AM   #5
jaya000 is offline jaya000  India
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I searched pedja rodgic buffer, but no response.
waiting for some more circuits.
Discreet or opamp, both ok. with or without volume also ok.
The preamp i want to use will hv 12V supply but amp hv got built in supply. 5 gain will ok. i.e. 200mv signal will be converted to 1V.
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Old 11th April 2007, 09:07 AM   #6
AndrewT is online now AndrewT  Scotland
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Hi,
CDP sends a signal with a peak voltage around 3Vpk.
that becomes 15Vpk into the power amp. It does not go!!!!
and cannot come from a 12Vdc power supply.

volume or not, discrete or opamp. Make up your mind.
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Old 11th April 2007, 09:21 AM   #7
juma is offline juma  Germany
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Quote:
Originally posted by Nordic
Please search for pedja rodgic buffer in this thread...

It is Pedja Rogic, not rodgic
This is the link to his web page:
http://www.pedjarogic.com/gc/index.html
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Old 11th April 2007, 12:31 PM   #8
jaya000 is offline jaya000  India
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my cd player has low output. The amplifier very low output. hence i thik that the output must be somewhere near 150~200mv. Hence thinking of using gain 5 preamp. Even less will be ok.
Discreet or opamp? I can use any of them which sserves my purpose.
Voume i can use if required.
Hope this clarifies what i want.
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Old 11th April 2007, 12:46 PM   #9
Nordic is offline Nordic  South Africa
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My bad...

Here is the link
Pedja Rogic's J-fet buffer for dummies.
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Old 11th April 2007, 04:44 PM   #10
palesha is offline palesha  India
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nordic, nice link. I want to use the same for my small preamp in fm modulator. Almost similar application as in this thread. The modulator IC TDA5664 is having low sensitivity in audio. so i want to add gain of 2~3. So i am also interested in this project.
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