When using a choke input filter, a minimum current should be drawn all the time when the device is switched on. This can be accomplished by:

A choke-input filter requires a minimum load current to be drawn at all times to maintain good voltage regulation and prevent the output voltage from soaring to the peak AC voltage. This continuous current draw ensures the choke operates properly and the filter acts as a continuous conduction system. To guarantee this minimum current is always drawn, even when the external load is disconnected, a bleeder resistor is placed across the power supply output. The bleeder continuously draws a steady, small current, acting as a reliable, fixed minimum load. Other options, like increasing the output capacitor or using a full-wave bridge, do not provide this necessary continuous fixed current draw. An ammeter only measures current and does not independently draw enough current to act as a load.