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  1. eetrit

    High Voltage Comparator???

    I am currently using a resitor devider-esque circuit with a FET. We would really like to use a nice comparator to decrease board real estate and increase response time. Comparators are in ns where the current system takes a couple us to become nice and stable. Just a thought though. These...
  2. eetrit

    High Voltage Comparator???

    I'm trying to make a basic switching power supply with a 48V supply rail-to-rail output comparator. An open collector output would be perfect.
  3. eetrit

    High Voltage Comparator???

    I was wondering if anyone knows a company that produces a rail to rail comparator that can be supplied by at least 48V. I would rather not use an op-amp because they are very very slow compared to a good comparator and the comparator has the open collector output that i need to decrease the...
  4. eetrit

    can multiple PWMs be controlled simultaneously by one PIC?

    Thanks for all the help. Great Ideas all around. We are probably going to have to use multiple controllers in order to accomplish our goal.
  5. eetrit

    Can portions of code for a PIC16F877 be used in a PIC12F683?

    I am wondering if anyone has used portions of their code for a 16F8XX in a PIC12F6XX. I have a project which we are expanding and I am using the 16F877 as the main controller loaded with the main program and the user interface and we plan on using the 12F683 as the peripheral controller to run...
  6. eetrit

    can multiple PWMs be controlled simultaneously by one PIC?

    I believe the time issue is where I'm having the problem. The heating element is smaller than a dime. It also heats up to 170 C in about 100ms. This is where my problem lies. I don't know if I can switch between heaters fast enough to regulate the temperature without burning up the element...
  7. eetrit

    can multiple PWMs be controlled simultaneously by one PIC?

    Thanks for the help. Good suggestions. My other issue for this same project is I want to constantly measure the temperature of a device so I can control the final temperature. Currently, I use the PIC to turn on the 48V heat circuit for a small amount of time, then switch to a 5V measuring...
  8. eetrit

    can multiple PWMs be controlled simultaneously by one PIC?

    I was wondering if anyone has used a microcontroller (preferably PIC) to control multiple PWMs which are used to control 4 heating elements. I would like to do this with as few chips as possible, hopefully 1 PIC. The project requires that each heater be monitored and controlled separately...
  9. eetrit

    Transistor Switching Noise???

    Hello. I tried everything on my board. I succeeded in reducing the emissions off the board but the status heartbeat is still loud and clear. Oh well, we'll deal with that later. Thanks again for all the help. At least we pass the EMC tests now.
  10. eetrit

    Transistor Switching Noise???

    Thanks for all the good info. I'm back at work and i'll be trying all your ideas. Thanks again.
  11. eetrit

    Transistor Switching Noise???

    Hello everyone, I have a prototype board that has a microcontroller that sends out a status heatbeat signal. The signal is generated by 2 transistors switching from high to low. One transistor for each line. The transmission lines appear to be equal and opposite of each other which is the...

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