Rules
Skinnyboy: Yes, Jocko is right. A car battery plus charger will probably weigh less than your proposed PSU.
On smoothing caps in PSU filters, simply remember CV = IT = Q.
T is time in seconds
I is the current drawn in amps
C is the capacitance in Farads
V is the change in voltage.
Q is the charge on the cap in Coulombs.
Use this eqn to calculate the necessary capacitance to achieve a specified ripple: V = ripple(p-p), T = 1/100 (for fullwave rectifier off 50Hz mains) or 1/120 (for fullwave rectifier off 60Hz mains).
Cheers
JFH
Skinnyboy: Yes, Jocko is right. A car battery plus charger will probably weigh less than your proposed PSU.
On smoothing caps in PSU filters, simply remember CV = IT = Q.
T is time in seconds
I is the current drawn in amps
C is the capacitance in Farads
V is the change in voltage.
Q is the charge on the cap in Coulombs.
Use this eqn to calculate the necessary capacitance to achieve a specified ripple: V = ripple(p-p), T = 1/100 (for fullwave rectifier off 50Hz mains) or 1/120 (for fullwave rectifier off 60Hz mains).
Cheers
JFH
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