27-01-2025, 08:18 PM
Hi
The snag with DC to DC converters is that they draw a certain amount of input current even with a very light load (or in the case of a clock, extremely light load). This will of course eventually drain the battery if the car isn't regularly used or you don't use a top-up charger. The best that one can do is choose a "mini" DC-DC converter model i.e. one having a low maximum power rating, to minimise the current drain.
The one linked below might suit, though you would of course have to house it in something. The output voltage setting is by means of two little link pads on the PCB. I successfully used one for a friend to drive a 12 volt petrol gauge on a 6 volt Seven, though admittedly it was ignition switched.
https://www.ebay.co.uk/itm/175905780884?...R570tJKVZQ
The snag with DC to DC converters is that they draw a certain amount of input current even with a very light load (or in the case of a clock, extremely light load). This will of course eventually drain the battery if the car isn't regularly used or you don't use a top-up charger. The best that one can do is choose a "mini" DC-DC converter model i.e. one having a low maximum power rating, to minimise the current drain.
The one linked below might suit, though you would of course have to house it in something. The output voltage setting is by means of two little link pads on the PCB. I successfully used one for a friend to drive a 12 volt petrol gauge on a 6 volt Seven, though admittedly it was ignition switched.
https://www.ebay.co.uk/itm/175905780884?...R570tJKVZQ