Simple line mixer

[jekirby]

Any folks who have the background in electronics take a look at this and tell me if it will work to combine gps and Ipod output to earphones. There is also an even simpler version with no pots. I know that this was intended for use on pre-amp levels but I understood that portable audio devices' outputs were comparable.

I may build both since they're cheap.

Mixer with pots

Combiner no pots

Thanks for you help.

 

[OhioFJR1300]

I'm no expert, but I'll bet that by the time you gather all the materials and put this together you will have enough invested to buy a ready made"mixer". I use an "Ampli-rider", set me back about $65.00 and it has 3 inputs and 1 output. Link to Ampli-Rider It even has a remote volume control so you can turn the volume down at intersections and turn it up a bit on the freeway. I have 2 Ampli-riders and they work great. :fan_1:

 

[jekirby]

I wasn't aware the Amplirider had more than one input, but if the combiner will work, then it will be less than 10.00 to make and the mixer will sure be less than 65.00. I will check that out though. Thanks!

 

[Geezer]

I 'd like to know if it works for you. If I read the diagram correctly it is not an amplifier and it requires no input power source, just input from the audio sources. I want to combine a mono GPS output and a mono radar detector output. Since both units have volume controls I don't need the pots on the mixer, I just want to protect the units from each other.

I was looking at the Amplirider but a home made solution is appealing to me, especially if I don't have to run 12V power or use batteries. The 12V power seems to be the biggest problem when combining audio devices because of grounding.

 

[HaulinAshe]

If you are using an Escort 8500 RD, it does NOT like having its audio output directly coupled to anything else. Escort sells an isolation cable and most comm systems sell one also. My strong advice is use one. The only exception is if your comm system or whatever destination device you are using, uses a separate battery source and is NOT powered by the bike.

For most devices, the combiner circuit will work with some attenuation as described. It's certainly better than wiring multiple devices together with a "Y-adapter" as some folks do.

For the circuits you listed to work properly, all input devices must share the same power source and negative/ground. If not, the impedance load will likely be incorrect or non-existent.