I am doing a project using NI DAQ USB 6008 to control an speaker. The DAQ analogic ouput range is 0 to 5 volts and the output current drive is 5 mA. But to control the speaker I need a different range. For example, I need a range that goes from -5V to 5V to the audio amplifier which will be conected to the speaker. My audio amplifier has input impedance 30 K ohms and minimum frequency 10 Hz.
I know that if my controller calculates a negative voltage output I can multiply this value to -1 (in the control algorithm) to the DAQ card send a value between 0~5V, and then I could change the polarity of this signal after the DAQ board output (implementing an circuit to change the polarity and using a digital output of the DAQ card as switcher). So, what I need is a circuit between the DAQ card and the audio amplifier to change the voltage polarity. I do not know if this is the best/simple way to solve this problem and how to I can do this circuit in a simple way. Any ideas?
Thanks in advance