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  1. S

    Generator AVR options

    Hi. Can anyone advise on finding an AVR for a very basic 230Vgenerator. It has 3 power phases and a single brush connected rotor winding. There is some residual magnetism for self-starting. There is no PMA or auxilliary windings. TIA Shane
  2. S

    3D CAM, servo or stepper ?

    Hi. Having just bought a 3D measurement machine with a working volume of about 1m^3, for conversion for additive and conventional machining, I would appreciate some advice. The machine currently has 3 servo-motors with tachs and position strips. I intend to use an Arduino to control position...
  3. S

    Puzzled, basic flyback converter

    Hi. Can anyone shed light on this trace ? A very basic flyback converter, channel 2 is the mosFET drain voltage, channel 1 is the transformer output. rectifier with 4ohm loadWhy am i seeing ringing on the output during the ON phase of the primary ?. If I short the (schottky) diode, the...
  4. S

    Driving a high power semiconductor laser

    What is involved in driving the higher power (kW) semiconductor lasers ? I am interested in building a system, but precise power control isn't needed. I would start with a much lower power one, maybe 100W, initially without even focusing the beam. Does anyone know of a fluid or gel that is...
  5. S

    Weird PC problem

    Hi. I have a PC which seems to collect water out of the air. Water has a habit of dripping out of the power inlet, and PSU fan sprays water inside the box. This is a 750W PSU, running off about 238VAC (mains power is unusually high), but the FSP power supply IS rated to 264V. Other 750W...
  6. S

    PCs blowing up

    Hi. An interesting and frustrating case: A friend has problems with newer PCs blowing up, even with a UPS. The most recent one leaked water after the event, so I am presuming that it has a water cooled CPU (or PSU ?) It is a gaming machine, so high power consumption and dissipation. We...
  7. S

    3-phase PWM

    Does anyone know of a chip that generates a multi-phase (interleaved) PWM, with the PWM controlled via SPI/I2C/CAN or other serial interface ? I want to build a multi-phase flyback converter to dump energy across 3 isolation transformers (common output). Multiphase to reduce input current...
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