Wiring 'Aux-in' (iPod) connectors to Car radios
The attached photos should give some idea how to connect an 'aux-in' lead to Radios in the Motorola 112/114/122/124 series(pictures are of a 114)
and the Motorola 515T/616T/717T/828T, 525/626/727/828series(equivalent to Radiomobile 970/980, etc.) In this case pictures are of a Motorola 828.
In all cases, the principle is the same. Break the connection between the detector o/p and the volume control 'hot' side, then connect one core of a two-core screened lead to the volume control, and the other to the detector o/p, with the screens going to the common return(V/C 'cold' side)
In the Motorola 114 series, simply remove a wire link between det. o/p & v/c
whilst in the older 727/828, etc., desolder the v/c 'hot' tag from the printed circuit, and CAREFULLY bend it clear thereof. To be certain the two points remain isolated from each other the track from the detector o/p can be cut near where the v/c tag was soldered.
The screened lead can be routed out of the radio's via(in the 114 series) the hole through which the battery & speaker leads are already passed, and in the 515/616/727/828, etc., by carefully enlarging a slot in the heatsink, the lead can exit this way. The usual connector for iPods & similar devices is a 3.5mm stereo jack, and there are various ways to accommodate this. Most recently I have used pcb mount 3.5mm stereo switched jack sockets, wired for mono use. This allows for radio reception
by removing the plug. As far as I know switched LINE sockets are not available, so an alternative might be to use an unswitched line socket.
If radio reception is still required, a DPDT switch can be fitted, allowing radio or aux source selection.
Apologies in advance if some of these pictures aren't too clear, but I hope they will be helpful.
(Note to Mods. Perhaps this post could go in the 'sticky' section)
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