The fabrication of a battery operated 3-channel high voltage pwoer supply for microchip capillary electrophoresis is described.The power supply consists of two positive and one negative DC-DC converters,a microprocessor controlled timer,a battery and a transformer to recharge the battery anf feed the high voltage relays.This arrangement allows the possibility to ocntrol the potential applied in the 0 to +-4000 V range to a variety of microchip setups.It can also be easily adapted to perform either gated or pinched injection.The inclusion of a rechargeable battery was adopted to feed the DC-DC coverters to reduce noise levels and achieve portability.
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