DC Linear Gain Amplification

[sbdwag]

I need a direct current linear amplifyer that with give me a gain of 10 from 1mv to 100 mv.

Output inpedance > 10kohms  VCC 5 volts Vee -5 volts

So far I have tried both a 741 and 324 opamp and both have problems below 40mv.

Any ideas would be appreciated

Regards
Dennis

 

[audioguru2]

The 741 and 324 are very old, noisy and have a high max input offset voltage. Newer opamps are laser-trimmed for very low input offset voltage and are much quieter.

 

[sbdwag]

I have a few TL071s  would those work good. If not what would you suggest.

Regards
Dennis

 

[audioguru2]

The TL071 is a good audio opamp but it is inexpensive. Its max input offset voltage is 10mV but you can add a trimpot to null it if you want.

Linear Technology and Analog Devices make some laser-trimmed opamps with extremely low input offset voltages.