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Quote from: recordista on April 12, 2004, 12:53:28 PMA TI PT78HT205 and a couple of caps will get you regulated +5V at 2A with a huge input range of 9-28 VDC. Total parts cost is under $20 from DigiKey even in single unit quantities. Wastes less power than a 7805, too...Hmmmmm...very, very interesting. So...for those comfortable with our soldering skills (but not terribly knowledgable about schematics and such - e.g., don't know what a "cap" is), what would this schematic look like, exactly?
A TI PT78HT205 and a couple of caps will get you regulated +5V at 2A with a huge input range of 9-28 VDC. Total parts cost is under $20 from DigiKey even in single unit quantities. Wastes less power than a 7805, too...
http://www-s.ti.com/sc/ds/pt78ht205.pdf is your friend.
damn this sucker is heavy. Does it come charged or do i need to charge it?
whats up drew. yea it is charging my jb3 right now w/ it's charge, had to murder the Creative ac adapter because i am impatient. I am assuming the SLA should drain completely before charging. I generally plug in a series of 12v automotive batteries for this. Also picked up something similar to what you got for the JB3 power inverter from radio shack. Will be making another trip tomorrow to grab up the adapter for the UA5 and the makings to repair my AC adapter.I also got the ~$12 wall wart charger Altex had pretty sure it is not "smart". The only other one they had were the fancy ~$45 ones. I also stocked up on RCA barrels and other adapters, very cheap.Let me know if you guys want some pictures and i'll snap a few.
Hey, when I left for school, the JB3 had been running for 24 hours!!! Ill let you know if its still running after school. The DMIC has pretty good run time, my smallest battery will run it for 7 hours and my others upwards of 9! Ive been swiching them out for the tests so the DMIC keeps going! I think the hosa battery will probably die before the JB3 though...