The E-C Apparatus Corp. EC 500 Power Supply operates in 3 modes: constant power, constant current or constant voltage. Constant power mode is especially crucial for techniques that require accurate temperature control, such as isoelectric focusing and DNA sequencing. Under constant power setting, the power supply adjusts to changing consitions during the course of the run without creating "hot spots" on the gel. It features an output voltage of 6000/2000V, an output current of 100/350mA, output power of 200W, 4 jacks, and automatic crossover between modes.