Converts AC circuit 10V AC with frequency of 30Hz to a variable DC voltage with 1A current. It uses voltage source of v(t) = 10 cos(120*pi*t) Vpk and a buffer to only use voltage of the source. The source only dissipates 4W of power. The transformer uses 50:111 turns so that V_(T2) = 22.1V. After the rectifier, the voltage drops to 20.7V. The capacitor is used as a filter so that the ripple voltage is only 0.002V. A Schottky diode of 20V is used to make the voltage a bit constant and then the voltage drops to 20V. After that, there is a VCVS dependent source with a gain of 1V/V; it's used so that the program correctly simulates the circuit. Otherwise, the circuit gets an error message. Then, a series voltage regulator is used so that the output makes an 18V DC and 1mA voltage and current respectively. If you use a CCCS dependent source to make the output with any voltage but passing 1A through.