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

Discussion in 'General Electronics Chat' started by pinoyballer, Nov 30, 2007.

1. ### pinoyballer Thread Starter Member

Oct 31, 2007
11
0
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.

2. ### nanovate Distinguished Member

May 7, 2007
665
1
An opamp maybe?

You need to provide more info.

3. ### pinoyballer Thread Starter Member

Oct 31, 2007
11
0
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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4. ### Ron H AAC Fanatic!

Apr 14, 2005
7,050
657
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.

5. ### thingmaker3 Retired Moderator

May 16, 2005
5,072
6
Most Op Amps could handle this.

And one thread is sufficient to discuss the topic.

6. ### Distort10n Active Member

Dec 25, 2006
429
1
OPA365 would be good.

7. ### cumesoftware Senior Member

Apr 27, 2007
1,330
10
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.

8. ### JoeJester AAC Fanatic!

Apr 26, 2005
3,373
1,159
You can search for Texas Instrument's Application Note, AN-31, Op amps for everyone. That will take you through the basics.