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Recent content by Gestalt

  1. G

    How do I control a MOSFET with an optical reflector?

    Is T1 really necessary? And if so, how do I pick the appropriate NPN transistor? Make, model#, characteristics?
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    How do I control a MOSFET with an optical reflector?

    How do I control a IRFP3710 MOSFET with the OPB740WZ Optical Reflector? Is this how I would wire it up? I want the optical reflector controlling the MOSFET like a switch.
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    How do I build a frequency controlled switch?

    Just a quick update. I came across this **broken link removed** by syscomp and it should be able to output the desired waveform with its arbitrary wave function, plus it has a super friendly UI. Just curious if anyone has come across other cool simple robust devices like this?
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    Optocoupling on a rotor disc

    With the optical reflective sensor I am concerned about getting a noisy reading due to the "spraying out" of light on the reflective material, and/or any small vibration on the rotor. I want to be able to make readings with millimeter precision. An optical chopper is a great idea, do you know...
  5. G

    Optocoupling on a rotor disc

    I am not trying to measure anything. I want to use the output for switching. IR photo-detectors, seems to be more in line with what I am looking for. I basically want the optical equivalent of a hall effect sensor, for timing/switching purposes.
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    Optocoupling on a rotor disc

    I need to setup a switching device that gets its input from a high speed 3000 - 5000rpm rotating disc. Rotor disc is about 1.5 feet in diameter. Readings are to be made on the outer perimeter. My fear is mechanical commutator style switch is to slow, and not robust enough, there may be issues...
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    How do I build a frequency controlled switch?

    Pulse frequency 1Hz - 7kHz controlled with ??? - Potentiometer What is a split second in number values ? ( Pulse OFF-time = voltage 0V ) I'm not sure what's technically feasible here...but i was hoping somewhere between 50 microseconds and 2ms. Is this pulse OFF-time constant value ? Yes it is...
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    How do I build a frequency controlled switch?

    How would I run the 555? As Monostable or Astable? And then how would I wire in the mosfet?
  9. G

    How do I build a frequency controlled switch?

    I want to take a steady DC Voltage of 15V-72V at 1.5amps and have it periodically drop to 0V. Below is the waveform I am looking for. I also want to be able to adjust the frequency of how often the downward spikes occur. I am looking to work in the range of 1Hz - 7kHz. I am thinking a simple...

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