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Recent content by P.Copper

  1. P.Copper

    [SOLVED] reading negative DC voltage from converter with ADC

    Is it still applicable to get +5V from -5V using the ICL7660? I'm asking this because in the datasheet they only mention converting positive voltages to negative voltages. I'm interested in converting from negative to positive voltages.
  2. P.Copper

    [SOLVED] reading negative DC voltage from converter with ADC

    So you're saying that "let's say I use a voltage divider as a sensor to output -5V from input of -100V then I use an inverting amplifier to get a positive 5V" ? - - - Updated - - - I'm using ADC of dsPIC30f4011, and LM358N op-amp. - - - Updated - - - I'm using ADC of dsPIC30f4011, and...
  3. P.Copper

    [SOLVED] reading negative DC voltage from converter with ADC

    Hi y'all, I have a converter that is designed to output a -100V but now I find it challenging to read that on ADC. My first approach was to use an inverting amplifier with a gain of 1, the problem is that i'm not sure if the op-amp will be able to handle 100V because most of the amplifiers are...
  4. P.Copper

    [SOLVED] direct PWM to MOSFET

    Thanks y'all problem solved by decreasing the resistance.
  5. P.Copper

    [SOLVED] direct PWM to MOSFET

    Oh shoot!!!! for some reason I used a 270ohm resistor instead of a calculated 5.6 ohm resistor.. - - - Updated - - - I'm testing it on a vero board, i'm not sure but i think i can handle up to 3A if i'm not mistaken. I stand to be corrected!
  6. P.Copper

    [SOLVED] direct PWM to MOSFET

    I do have a gate driver circuit, i used the HCPL 3120 gate driver but the problem still persists. how much more current specifically? the HCPL that i'm using gives out 2A.
  7. P.Copper

    [SOLVED] direct PWM to MOSFET

    no, the first trace is the gate signal before i connect it to the mosfet, the second is after connecting it - - - Updated - - - i'm using IRFB4229Pbf
  8. P.Copper

    [SOLVED] direct PWM to MOSFET

    what do you mean by .
  9. P.Copper

    [SOLVED] direct PWM to MOSFET

    Hi y'all I'm trying to drive the MOSFET directly with the PWM. I generated a PWM signal using dspic30f4011 and because the MOSFET needs atleast 10V to switch on. I then used a MOSFET gate driver (HCPL 3120) to boost the voltage. I get a nice clean gate signal but immediately when i connect...
  10. P.Copper

    Voltage divider(as sensor) interfaced with DSPIC30F4011

    Thanks FvM, the rail-to-rail op-amps solved the problem.
  11. P.Copper

    Voltage divider(as sensor) interfaced with DSPIC30F4011

    Thanks for the feedback! let me redo the design and will let you know of the outcome.
  12. P.Copper

    Voltage divider(as sensor) interfaced with DSPIC30F4011

    if that's the case, that might be why such a huge voltage drop b'cos my voltage divider output resistance was calculated to be 22k.
  13. P.Copper

    Voltage divider(as sensor) interfaced with DSPIC30F4011

    can you please explain, the thing i'm using power resistors with rating of 5W. do you think that might be the problem?
  14. P.Copper

    Voltage divider(as sensor) interfaced with DSPIC30F4011

    Hi y'all, I have build 3 voltage divider circuits for sensing DC voltage, the output of this voltage dividers will then be fed to 3 analog channels of the dspic30f. the problem is once i interface the two circuits(voltage divider and dspic30f) the output voltage of 2 of the voltage dividers...
  15. P.Copper

    [SOLVED] Voltage divider and high current

    yes my output is 5V which will be going to dsPIC30f
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