23-11-2012, 10:35 AM
This is a 1954 Car radio to which I am in the process of adding a lead/socket assembly to allow the connection of an I-pod. Basically I am using two-core screened lead terminated in a switched Jack of the type used to connect headphones to an amplifier. The extra contacts on such a socket will allow for the inclusion of series resistors of (say)220 ohms, one from each channel to the (mono) amplifier input of the radio. Because the I-pod only has an earphone output, should 'load' resistors of maybe 10 ohms be connected between the L & R (Tip & ring) pins of the jack and common negative?
I have never in the past fitted such resistors, but I'm sure I read somewhere that they should be fitted, since the radio's input impedance is somewhat higher than the o/p Z of the I-pod.
I have never in the past fitted such resistors, but I'm sure I read somewhere that they should be fitted, since the radio's input impedance is somewhat higher than the o/p Z of the I-pod.
