Inverting an AO signal.

[imperial-aero]

Hi,

I'm using a PCI 6229 device to output four signals (this is the maximum possible number of Analogue Outputs from this device). I need to get an inverse of these four outputs to get further four outputs. I'm new to signal processing and wanted to know whether there is a practical device that can actually invert an electrical signal.

Regards,

Ruf.

[KostasB]

Hi,

the inverting op-amp would give you a solution. Please note that you will need to supply external power to your circuit.

In your case, you just need a inverter so the set the gain ratio to -1 ( by choosing equal input and feedback resistor values).

The following tutorial explains their operation, you can order these components from companies like RS Components, Maplin e.t.c.

http://www.wisc-online.com/objects/index_tj.asp?objID=SSE5403

Let us know how you got on,

KostasB

NI UK

[imperial-aero]

Hi KostasB,

Thanks for the help. I'm actually using a power amplifier to amplify the signals (from which they go to loudspeakers). Someone else suggested that I could just invert the +ve and -ve cables and it might invert the signals. I'm not sure whether it would work, but I'll give it a try. If not, I'll try out your method. I've learned about op-amps in my undergraduate course, but I've never actually thought that they'd come as small devices for me to use.

Will let you know how it goes.

Ruf.