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Old 17th Sep 2015, 10:01 am   #17
'LIVEWIRE?'
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Join Date: Mar 2006
Location: N.W. Oxfordshire(Chipping Norton)
Posts: 7,306
Default Re: Wiring 'Aux-in'(iPod)connectors to Car radios

As a follow-up to my earlier posts, here are some pictures of an 'aux-in' adapter I made up to add to a Radiomobile 108SR. This player is stereo, but the principle is the same as for the mono radios mentioned earlier, except that there is no need to combine the stereo outputs into one channel as is the case with mono radios. Shunt resistors, to provide a charging path for any capacitor(s) in the I-pod or other device, series resistors, and shunt capacitors, to assist in RFI suppression, are, at the suggestion of M. Hennesey, included. In this case I used 4 x 820R, and 2 x 390pf ceramic caps., simply because I had them to hand. Picture #1 is actually the PCB Layout of a 108SR with my notes as to where to break into the circuit in order to add 'aux-in' adapters. Pictures 2 & 3 show the internal connections between the 3.5mm stereo jack socket and the Radio/Aux c/o switch, but with 3k3 series resistors in pic.2, which I later reduced to 820 ohm as shown in pic.3 to improve the sensitivity of the aux. i/p. I'll try and post a diagram later.
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Last edited by 'LIVEWIRE?'; 17th Sep 2015 at 10:12 am.
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