Dual Power Supply +24V /-24V by IC 7824 + 7924

This supply gives both positive and negative outputs. Appropriate Fuses should be used to protect from fire hazard and overload of transformer. The Filter capacitor C1 4700uF has an impedance of Xc = 1 / (2 * 3.14 * f * C) which comes to 0.6 ohms at 50 Hz. The impedance of the load at 2A for 24V is R = V / I that is 12 Ohms which is more than 20 times the impedance of the capacitor at 50 Hz. That means less than 1 / 20 of ripple current will flow thru the load. The Regulator also reduces the ripple a little.

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http://schematics.blogspot.com/2004/10/dual-power-supply.html
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Dual Power Supply +24V /-24V by IC 7824 + 7924