TheMatrix65
New Member
I have a battery-operated Trafficmaster which tells me of any traffic jams 12 miles ahead of me, etc. This device uses 3 x AAA batteries which I usually replace approximately 1-2 months, depending on how often I drive my car. Now, I would like to wire it "permanently" to a car battery by way of a transformer to downgrade 12v into 4.5v with the equivalent amperage as those of 3 x AAA batteries. Could anyone design such a small transformer that would do the job so it would save me buying batteries all the time. The design (pcb and components) would need to be small enough, say 6cm by 3cm by 6cm, overall? (Those are approximations, as I am installing it near the courtesy light compartment (it has a permanent 12v feed as well as ground feed)).
Much appreciated.
Much appreciated.