On Sat, 3 Mar 2012 16:38:52 -0500, Gordon Williams wrote: :: I think what is blowing the fuse is the inrush current. I know :: that there :: is a noticeable spark when I touch the battery power lead to the :: circuit. :: :: Are there rules that I should be following to size the fuse :: properly? I'm :: concerned about reliability. Why not put a NTC resistor in series with the positive lead to the cap?=20 Look for a varistor or maybe a cheap NTC Thermistor could be sued. Colin -- cdb, colin@btech-online.co.uk on 4/03/2012 =20 Web presence: www.btech-online.co.uk =20 =20 Hosted by: www.justhost.com.au =20 =20 This email is to be considered private if addressed to a named individual= =20 or Personnel Department, and public if addressed to a blog, forum or news= =20 article. =20 =20 =20 --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .