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  1. A

    Power supply for a system

    Hi guys, I have a device with 4 subsystems that needs to be powered up from rechargeable batteries, the batteries needs to be charged up through a solar panel. I need + and - 9V for an opamp, 5V for the microprocessor, 3.8V for a transmisson unit and 1.2 V for the opamp input. All the...
  2. A

    Measuring Liquid conductivity

    Hi all, I am working on a project that aims at measuring the conductivity of sea water. For this purpose I will be building a simple circuit made of a two electrodes dipped into the water and a resistor, then I will be using an instrumentation differential amplifier to measure the voltage...
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