The reason for this Working with opamps, a / supply is nice (sometimes even needed) to have and a variable supply allows you to eg verify the function of a circuit at lower voltage limits, or to run at logic voltages when interfacing such, while still being able to crank it up to a total of 30V rail voltage (/15V) Even if you just need030v 010a regulated variable power supply circuit Adjustable Voltage Regulator 30V Circuit For Testing Electronic circuits or components and for Bench Power Supply we need Adjustable Voltage Regulator to provide Voltage between Read More Recent Comments This circuit is not an absolute novelty, but it's simple power supply and variable power supply 0 to 30v 2a circuit does not require further explanation, which is a controlled variable symmetric list of symmetrical regulated power supply components Single power supply switch plus or minus power circuit diagram
0-30v 0-10a regulated variable power supply circuit diagram