Control circuit for light-emitting diodes

A control circuit for a plurality of light-emitting diodes (LEDs) connected in series, comprising:

• a first power supply connected to an anode of a first one of the LEDs;
• a first electronic switch, wherein a control terminal of the first electronic switch receives a control signal, a first terminal of the first electronic switch is connected to a second power supply, and a second terminal of the first electronic switch is grounded through a first resistor;
• and
• a second electronic switch, wherein a control terminal of the second electronic switch is connected to the second terminal of the first electronic switch, a first terminal of the second electronic switch is connected to a cathode of a last one of the LEDs, and a second terminal of the second electronic switch is grounded through a second resistor.