Ham Radio extension speaker wiring

[Flump]

I have a nice computer desktop speaker
it has its own amp in and runs off a mains
powersupply, it has a wire with a stereo
3.5mm jack on the end and im using a
3.5mm stereo or mono converter and it works great.

I would like to be able to use the speaker on other radios too
at the same time, can i just splice into the lead and add another
to it or would i need to add a diode inline to stop signal going
from one radio to another through the speaker leads ?

[Simon]

ideally you want a mixer. If this is for CB and not "high end" audio you can knock something up with an opamp

[Flump]

would this do Simon ?

http://www.tradeofic.com/Circuit/11360-TWO_CHANNEL_AUDIO_MIXER.html

[Simon]

yes that is your basic mixing configuration, you can add as many extra channels as you want (within reason i guess). I'm sure others will want to peper it with capacitors and other improvements but that is your starting point. The + input of the amp should have a smoothing capacitor on it really.