Its a circuit of adjustable 10-A regulator , with the IC LM338. The first working mode 220V AC current reveled by T1 to 30VAC then rectified by four diodes D1,D2,D3,and D4 and become less than 30VDC. Not enough to be rectified voltage is filtered in the C1 and C2. And CT/ground should not be used because the voltage needed on the circuit above is only plus and min, so the ground was stopped first. After the voltage is filtered and then go to two IC , for setting the voltage output is on Vr1, the output voltage of 0 to 30 Volt DC regulated.
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