Sirius radio car dc power

Thread Starter

big jim

Joined May 31, 2009
3
What's inside the cigarette lighter adapter that steps down 12 volt dc to about 5 volt dc for the Sirius radio? What's the electronics/schematic? If I guess the current of the radio at 0.5 amps and a voltage drop of 7 volts then using Ohm's law I need a series resitor of 14 ohms at 3.5 watts.
 

Thread Starter

big jim

Joined May 31, 2009
3
Thanks radiohead,
What's the schematic for "buck" type switching regulator SMT circuit LM7805 +5V regulator?
 
Top