That common negative to pin 4 of the transformer. Negative terminals of the stereo input jacks connect to each other, and another wire connects Mistakes (from this view, the transformer's blue dot is behind pin 1). I numbered the transformer pins to help prevent This parts layout resembles the schematic shown earlier. I installed the jacks and connected the parts using point-to-point wiring: You could also melt holes with a soldering iron. Stereo input and one on the far end for monophonic output. You need to make three holes in the box for phono jacks: two on one end for the Note the blue dot, which identifies pin 1 of the six-pin transformer. It's designed for mounting on a PC board, but you can wrap wires around its The heart of the adaptor is an audio transformer, a Triad TY-142P that costs aboutįive bucks. Plastic project box measuring 1x2x3 inches, but you can use any similar enclosure. In this simple adaptor, the layout of parts is not critical. So if you don't find those exact part numbers, search Note that Mouser may change part numbers or discontinue products, The adaptor can be built in an evening and it uses common parts costing less than $20. One cable goesįrom the phone's earphone jack to the adaptor and the second goes from the adaptor to The photo also shows my iPhone and two cables for connecting the adaptor. Here's a photo of the finished adaptor, built in a little plastic project box. Best of all, the adaptor requires no power! It converts the stereo to mono and it alsoĮlectrically isolates your player from the radio chassis, providing a safetyīenefit. This adaptor was first designed for use with an iPod, but it can play fromĪny audio device that produces standard stereo output: an iPod, smartphone, bluetooth This inexpensive adaptor lets you plug an iPod or similarĪudio device into that Phono jack and play new music through your old radio. Many vintage radios have a Phono jack in the rear that lets you connectĪ record player. Building an iPod Adaptor for Vintage Radios
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