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Old 14th May 2005, 03:04 AM   #21
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well... it was kinda for testing car amplifiers and stuff... under load... hmm
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Old 18th May 2005, 07:04 PM   #22
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Well, if it is just for testing car amplifiers and such.........

Get a battery. Two, if you have to. Why make it so hard????

Jocko
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Old 19th May 2005, 09:36 AM   #23
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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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