|18th May 2005, 07:04 PM||#22|
Join Date: Feb 2002
Location: As far from the NOSsers as possible
Well, if it is just for testing car amplifiers and such.........
Get a battery. Two, if you have to. Why make it so hard????
|19th May 2005, 09:36 AM||#23|
Join Date: Feb 2005
Location: nr LongHope, Glos. UK
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).
At Spes Infracta
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