I am new to op-amps and have a couple of questions.
I am building a function generator that operates in the range of 1-100000Hz.
The different waveforms have different voltage levels that I want to control. In a different thread I got some tip to change the voltage offset with a capacitor and resistors.
I also got a tip to use a op-amp. I have thought about the op-amp and it seems to be a good idea because of the buffer functionality.
Now to my questions
1. Can I use a differential amplifier subtractor circuit to change the voltage of a signal?
Eg. My signal is 2-7V. I connect the signal to Va(-) and 2V to Vb(+). Will the output signal become 0-5V? (with the right resistors)
2. Which op-amp should I buy for my project? (Signal generator or Synth)
It exists A LOT of different op-amps. I am not sure what to buy.
For example is LT104 (http://www.linear.com/product/LT1014
) a good one?
Any tip of another good op-amp that is cheap?