You'll notice that, in the first figure, the ground side of the audio input (White) and the ground side of the power input (Brown) are connected together. This is a no-no for the Uniden 246 and 396 (and maybe others). However, the two points are capacitively isolated from each other (by C10), so if you just leave out the jumper, the scanners should be happy.JnglMassiv said:Here's a pretty awesome document compiled by N0SS going into detail about how to make some of these work:
The speakers on that page are all amplified by circuits within the speaker housing. They do require external power. You can also get stand-alone speakers that are strickly passive. This would mean they are powered by the phone/audio out jack. I don't have any experience with this configuration but my guess is that if you need considereably more audio than that provided by the scanner's internal speaker, you may be disappointed.Asmitty0010 said:Looking at the mod page...does the speaker need some type of electrical power to work? or can you just plug a 1/8 jack into the back of ur scanner.