What are the features of power supply?

what the characteristic of power supply?

Ans: The electronic part of the Audine camera requires a +/-15V symmetrical power supply. Consumption is 30 mA for the positive voltage and 10 mA for the negative voltage. If possible, the peak-to-peak ripple must be lower than 5 mV. To reduce the electronic noise level, it is recommended to choose a linear type power supply instead of a switching power supply since the aim is to control sensitive electronic circuits such as the ones in a CCD camera. The required power supply can be easily built using 7815-type voltage regulators (for the positive voltage) and 7915 regulators for the negative voltage as well as a transformer, a few capacitors and rectifier diodes.