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My car stereo has only one 'Aux' input, but I have several gadgets that I like to hear on a trip without swapping cables: MP3 Player, talking GPS, Bla...
Materials: Qty 1 --- Altoids Tin. See Note 1. Qty 5 --- 1/8" (3.5mm) Stereo input Jacks, Radio Shack part 274-249 or equiv. Qty 8 -...
Tools: - Fine Needle-nose pliers - Fine diagonal-cut wire cutters - Punch or Awl - Ruler or Calipers - Drill and 1/4" drill bit - Low power soldering ...
Scribe a line on the tin 1/4" from the bottom edge on these two sides: - the long side opposite the hinge side (input jacks) - one of the short...
Mark and pre-punch the positions for drilling the holes on the center-line with an awl or fine marker. Position is not super critical, but should be e...
Drill each hole with a 1/4 drill bit. Again, a small piece of wood behind the metal will keep it from bending and make the backside of the holes neate...
Remove the retaining nuts from each jack and fit a jack into each hole. You may need to open the holes with a knife, drill bit or small round file. D...
1) Locate the ground tab on your audio jacks. This is the one that connects to the metal barrel on the jack, and is usually closest to the case when t...
After the ground wire is soldered to all the jacks, replace all the jacks into their holes and add the retainer rings, tightening firmly.
1) Take a resistor and attach to the middle tabs of the output jack (the one by itself) and the closest input jack (see picture). - Make sure the...
1) attach a resistor to the middle tab of the next input jack - solder & trim excess wire 2) wrap the other lead of the resistor around the lead o...
1) Take a resistor and attach to the outer/left-challe tabs of the output jack (the one by itself) and the closest input jack (see picture). - Ma...
1) attach a resistor to the outer tab of the next input jack - solder & trim excess wire 2) wrap the other lead of the resistor around the lead of...
Congratulations, you should now be done. Close up the Altoids tin and test the mixer: - attach the output jack to a known good powered speaker - atta...
It may look strange to build an electronics project without a circuit board in this open wiring style. Old timers called it "rats nest" wiring, but de...
FAQ's 1) Do I really need resistors? Absolutely, Yes. It's a very bad idea to connect active outputs together without some resistance in between...
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