I have a progressive charger/converter that replaced the old liniar supply it's dead quiet I basically use it as my DC supply for the radio when plugged in depending on battery charge somewhere between 13.2 13.8 volts @ 40 amp possible output. Broad voltage range LED's make a lot of noise! I bought some very nice flush mount LED fixtures (5 to 30 volt) they totally wiped out my FM radio, complete desince! I had to remove the switching supplies and run them with a 10 volt regulator.
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