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| TIP31 pinouts above. |
The circuit above is another bench power supply, but with 2 modification. The modifications, above is replacing the variable resistor for current limiting to a transistor, so that heat can be dissipated easily that a normal variable resistor. The circuit allows the current to be lowered from 0 to 2 amps, with proper heatsinking. The second modification is the bypass switch where it allows the full current from the power supply to be able to be used, instead of having a limit, because there is a current drop from the transistor. Other than these 2 modifications, everything else is the same as the other schematic.
