This is a 30v 10a power supply schematic that can provide output of 1.5v to 30v DC and current of 0 to 10A max. Use a 5k potentiometer to adjust the power supply and a 10k potentiometer with a BD139 transistor to adjust current power.
2 power Transistor 2N3055 | TIP3055 is used in this circuit to control the output current. Use the Appropriate heat sink to adjust both transistors because at high current transistors are hot. Also use a heat sink with LM317 regulator ic.
If you need a current limit of 5A at the output then use a 5A transformer. If you need a 10A use a 10A transformer or SMPS. The output current depends on the input transformer current. A 2amp transformer will not supply more than a current 2A.Â
The Bridge rectifier module is available in the market for 15A or different current ratings, you can use as per your transformer current. Adjust the circuit to the cabinet and both the potentiometer knob connected to the circuit should come out of the cabinet for adjust voltage and current.