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  1. PaulM

    How to remotely control pump engine?

    I'm looking for an inexpensive reliable way to remotely control a pump engine. It already has it's own manual controller so I just need to interface with it. I'm thinking a radio link with several inputs and outputs, like this...
  2. PaulM

    CBA II problem: stops test part way?

    Has anyone had this problem before? Testing a few batteries at work has revealed this problem. The CBA stops testing only 1 or 2 Ah into the test, the Ah display shows "NaN", the current display is 0 or NaN, the voltage display is the actual voltage and the fan and both LED's are still on...
  3. PaulM

    Removing ripple from DC current measurment??

    I'm working on an off-grid solar system for work that is going to power some measurement equipment. It consists of 6 240W solar panels, a 60 amp Morningstar MPPT charge controller, an Outback 2.5 kW inverter and a 24 volt, 1820 Ah battery. To keep tabs on the system, we have installed a...
  4. PaulM

    variable DC/DC converter needed, 24 in, 3 - 8 out

    I am in need of a cheap way to convert 24 vdc down to a range of 3 to 8 vdc, up to about 3 amps, to power the field coil on my alternator. So far I haven't found a DC/DC converter that is suitable for this, and they all seem quite expensive. One option is to use an LM338 circuit, but I...
  5. PaulM

    Synchronous versus asynchronous?

    I am working on converting an alternator to a motor and am in the process of testing right now. http://endless-sphere.com/forums/viewtopic.php?f=10&t=8420 What I would like to know is if this "motor" is considered synchronous or not. Are all BLDC motors synchronous? It is my impression that...
  6. PaulM

    small variable power supply?

    Any good sources for an inexpensive small power supply, say 0 to 12 volts up to 5 amps? I can run it off AC or battery if required. Is it possible to build something that will work reasonably well? I have a lot of salvaged electronic components; is there any recommended schematics on how to...
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