Well... motorcycle battery to be precise.
I'm working on building a simple mixer and headphone amp for my motorcycle. I know several good commercial solutions exist and I even own an Autocom system. I simply want a project to learn a bit more about audio circuits.
Motorcycle has the following devices, all powered from the bike's battery:
- Garmin zumo GPS
- iPod
- Escort Redline radar detector
- Laser Interceptor jammer
Each device's audio ground seems to be handled slightly different.
Autocom makes a unit which is a intercom, mixer, VOX for 2-way and amplifier. There audio ground has zero ohm resistance to power ground. The source devices don't necessarily share this design consideration. They avoid ground loops by using 1:1 audio transformers designed for analog phones. These transformers are in cables.
What design considerations should I look at in solving grounding issues problems? I'd like to avoid the transformer approach because of cost and board space issues. Are there other options for handling possible issues with the analog ground reference?
