For our design, we have decided to implement a communications interface for a lego mindstorm robot kit. Our overall goal is to allow a robot to transmit sounds in an audible frequency range to another robot. We want to convert the analog voltage from the connection ports to a digital frequency that can be transmitted from one robot
as certain commands. As we are still in our beginning stages, a lot more investigation needs to take place, but I was curious if anyone knew of a place to get a quality A-F converter that could convert into audible sounds? Any other
suggestions would be appreciated too.

 

John,

Take a look at the Analog Devices AD654:

"http://products.analog.com/products/attributeButton.asp?product=AD654&attributeID=13":http://products.analog.com/products/attributeButton.asp?product=AD654&attributeID=13

"http://www.analog.com/technology/dataConverters/voltageToFrequency/app_notes.html":http://www.analog.com/technology/dataConverters/voltageToFrequency/app_notes.html

but:

"http://www.personal.psu.edu/faculty/a/x/axl17/art10.htm":http://www.personal.psu.edu/faculty/a/x/axl17/art10.htm

Shouldn't be any trouble at all to put the input voltage range you are looking for into an audible frequency range. Be sure to use a good quality capacitor for good results over temperature, and read the warning (last link). Have fun!::

Willy Smith
Numatics, Inc.
Costa Rica