M
[email protected]
- Jan 1, 1970
- 0
I got a used 36-volt Crystalyte hub motor and controller from Craigslist. (The guy who sold it to me said they can take 72 volts, but I'm still trying to confirm that from their website, which is a bit skimpy. Looks like I'll have to email them.)
Motor = 400 X4 (408)
http://www.crystalyte.com/
I tried 48V (4x 12v SLA batteries, 8 A-h each), and the bike worked fine for about 3 miles, but left me to pedal the remaining 9 miles home from work.
Since the 12V 8 A-h batteries are $33 each from Home Depot, I wondered about returning them and buying a (heavy!) 12V, 85 A-h deep cycle battery from Costco (only $68). If I go that route, I'll need a DC-DC converter, converting 12V to 48V.
I'm thinking of the LT1339, and apparently the output voltage is set by Vout = 1.25 (1 + R2/R1), from page 9 of the datasheet.
http://cds.linear.com/docs/Datasheet/1339fas.pdf
Is the output current set by what ever the input supply can provide?
This 555 circuit looks like fun too.
http://www.dos4ever.com/flyback/flyback.html
Since I want the output voltage to be 4x the input voltage, is a duty cycle of 75% correct?
Thanks,
Michael
Motor = 400 X4 (408)
http://www.crystalyte.com/
I tried 48V (4x 12v SLA batteries, 8 A-h each), and the bike worked fine for about 3 miles, but left me to pedal the remaining 9 miles home from work.
Since the 12V 8 A-h batteries are $33 each from Home Depot, I wondered about returning them and buying a (heavy!) 12V, 85 A-h deep cycle battery from Costco (only $68). If I go that route, I'll need a DC-DC converter, converting 12V to 48V.
I'm thinking of the LT1339, and apparently the output voltage is set by Vout = 1.25 (1 + R2/R1), from page 9 of the datasheet.
http://cds.linear.com/docs/Datasheet/1339fas.pdf
Is the output current set by what ever the input supply can provide?
This 555 circuit looks like fun too.
http://www.dos4ever.com/flyback/flyback.html
Since I want the output voltage to be 4x the input voltage, is a duty cycle of 75% correct?
Thanks,
Michael