# help how can i have a gain around 500 and frequency ranges from 0 to 100k ac signal

#### pinoyballer

Joined Oct 31, 2007
11
theres a as ac sinewave signal with a 10 mV peak to peak. I want it to have a gain of 500 so it will have 5 Volts peak to peak. And the range of frequence that you can do this is from 0 to 100k Hz. Is there a chip you can use to do this. any circuit you guys can give me to do. is it posible to power this using a usb of a laptop? how can you convert the +5 volts of a usb to -5 volts. i need the negative voltage for the V- of the op amp.

#### nanovate

Joined May 7, 2007
666
An opamp maybe?

#### pinoyballer

Joined Oct 31, 2007
11
theres a as ac sinewave signal with a 10 mV peak to peak. I want it to have a gain of 500 so it will have 5 Volts peak to peak. And the range of frequence that you can do this is from 0 to 100k Hz. Is there a chip you can use to do this. any circuit you guys can give me to do.
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#### Ron H

Joined Apr 14, 2005
7,014
You will need an op amp with a gain bandwidth product over 50MHz, or a couple of more modest op amps in cascade.
Can you give a real low frequency limit? A frequency of 0Hz is DC.
Also - please don't double post.

#### thingmaker3

Joined May 16, 2005
5,084
Most Op Amps could handle this.

And one thread is sufficient to discuss the topic.

#### Distort10n

Joined Dec 25, 2006
429
OPA365 would be good.

#### bloguetronica

Joined Apr 27, 2007
1,372
theres a as ac sinewave signal with a 10 mV peak to peak. I want it to have a gain of 500 so it will have 5 Volts peak to peak. And the range of frequence that you can do this is from 0 to 100k Hz. Is there a chip you can use to do this. any circuit you guys can give me to do.
Do you want a power amplifier (for low impedance loads, namely speakers, audio amps are good for this) or a voltage amplifier (rather high impedance loads, a op-amp will do)?

100Hz is well within the frequency range of an audio amplifier, hence the question.

#### JoeJester

Joined Apr 26, 2005
4,259
You can search for Texas Instrument's Application Note, AN-31, Op amps for everyone. That will take you through the basics.