Recent content by jsteve126

  1. jsteve126

    90VDC Motor Controller

    Thanks hero999. Yes, it does look dangerous. I should say that the ac-dc motor drive part is not my design. I took this from an existing motor controller PCB that I have. It is all self contained, ie. just power cable and one pot for speed control. I want to add control from my PC. I am thinking...
  2. jsteve126

    90VDC Motor Controller

    I am currently trying to build a speed controller for a 90VDC motor. Please see the attached schematic. My  question is; should GND and GNDB be connected directly or should there be some kind of isolation? I thought that a common GND would be necessary and bread-boarded it that way. It seemed to...
  3. jsteve126

    0-30V Stabilized Power Supply

    Thanks for that audioguru. Well, it's done. Seems to be working perfectly. Here are some pics of the finished project. The top case is bolted to the large transformer on the bottom. The transformer inside the top case is for the 5V panel meter and fan board in the centre. This board uses an...
  4. jsteve126

    0-30V Stabilized Power Supply

    Just finished building my SPS. Can anyone point me to the page/s that talk about adjusting the trims and final testing procedures? A lot of pages to search through! Initial testing; I get full range of volts (0-30V) and can pull about 4A charging a 12V battery at 13.7V. Current limiting is...
  5. jsteve126

    0-30V Stabilized Power Supply

    Thanks for your response audioguru. It is appreciated. I'm surprised to learn that this, what I thought was quite a powerful transformer, is not that suitable. I have just measured the voltage with a 30,000uF cap across it and it was 35VDC. Does that sound about right for a transformer of this...
  6. jsteve126

    0-30V Stabilized Power Supply

    I am going to try this project. I would like some advice about the transformer I intend to use. It is rated at 24V 400VA. Measuring the output, I get: 27.1VAC, rectified (no with caps) to 24VDC. Is this suitable for this project? Thanks
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