- Continued reading on LM2576.
- Discovered it won't work (maximum input voltage is 40V).
- DC-DC converters are all enormous !!
- Searched thoroughly, and could not find a DC-DC regulator that would handle input between 30V to 42.4V (ie the range of my batteries) and output at 12V ... and would handle 3.4A "inrush" current ... and run happily on 130mA (hold current)
- The answer is the LM338K (3V-37V 5A Adjustable) ... it is in a TO-3 package, so just have to work out how to use this package.
- Printed the datasheet
Kart progress
- Printed the plans to go to Poppy's (for welding).
- Went to Poppy's house.
- Worked all day, and completed the Axle ... as well as buying steel for the remainder of the Kart.
- Axle is good. Mounting for brake and gear is the best ... wheel has a slight wobble in it (darn ! but may be able to fix this).
- Got a major headache (probably not enough food / water / caffeine).
