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Recent content by rprodrigues

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    Does the generic Jlink V8 or Ulin 2 really support STM32F407 ?

    Does the generic Jlink V8 or Ulink 2 really support STM32F407 ? Hi, Does generic Jlink V8 or Ulink 2 really support STM32F407 (Cortex M4 core) ? Generic Jlink V8: **broken link removed** Generic Ulink v2: https://www.hotmcu.com/ulink2-debug-adapter-with-usb-interface-p-9.html?cPath=3_25...
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    MRF24J40 and XBEE communication

    Hi all, I have a few mrf24j40 modules that will be part of new devices in development. These new devices must communicate with others ones that are using XBEE modules in (serial) transparent module (without Zigbee stack). Is it possible to use the mrf24j40 module in serial transparent mode so...
  3. R

    External control for a DSLR

    Hello, I need to developed a circuit to control when a DLSR should take a picture and to download this picture. Is it possible? Where could I find literature about controlling a DLSR by means of external circuits (necessary schematic connections and protocol of communication) ? Thank you
  4. R

    Solutions manual for Kalman filtering book

    Hello, Does anyone know where I can buy the "Solutions manual" (ISBN:978-0-471-17363-2) for the book "Introduction to Random Signals and Applied Kalman Filtering with Matlab Exercise, 3rd edition" ? Thank you, Rodrigo
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    Kalman filter book: comments and suggestions needed...

    Hello, I plan to start studying Kalman filter to apply it as a tool in my developments. In special, I'm looking for a book with its theory and a good engineering view point (with application tips and algorithms). I've found that the book "Introduction to Random Signal and Applied Kalman...
  6. R

    Overcurrent protection for 4-20mA inputs

    sunyuan, Thank you very much!!!!!! rprodrigues
  7. R

    Simple load switch using FET

    Hi guys, I will use the load switch shown in the picture below to supply current to a 5V / 100mA load. I made some simulations with PSPICE and the voltage drop across the MOSFET is about 50 mV at 100mA, what is fine for my requeriments. Am I wrong or the schematic shown is really that...
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    Looking for a 5v to 3.3V, 500mA regulator high efficiency

    Re: Looking for a 5v to 3.3V, 500mA regulator high efficienc By the way, the family LM2675 is a great family for this kind of regulators! Try them! Added after 14 seconds: By the way, the family LM2675 is a great family for this kind of regulators! Try them!
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    Voltage regulator with a buffer + voltage divider

    Guys, I decided to go with an LM2675 from National!!!! It is a switching regulator with a wonderful efficiency (about 86% ~ 90%). Thank you very much! :D
  10. R

    Voltage regulator with a buffer + voltage divider

    FvM, The problem is that I plan to achieve the better power efficiency I can since my circuit is connected to a battery. And If I use a LDO and before running the power lead to it I passed it through a series diode to decrease the power voltage about 1V. Could it be a more power efficient...
  11. R

    Voltage regulator with a buffer + voltage divider

    You are right. That circuit is not a good one for the purpose I said you. What I need is to get 5v from 7v but without using a switching regulator and achieving the better efficiency possible. A simple way to do this would be using two 1N4004 diodes in series so I can get about 5V when under...
  12. R

    Voltage regulator with a buffer + voltage divider

    Hi guys, I do need your assistance again. This time I plan to get 5v from 7v, and to do it I will use a simple voltage divider to get 5V from 7V and pass it trough a buffer (opamp), so I get it stable at the output side of the regulator (opamp). Is this schema a power safe one or it would...
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    Looking for a 5v to 3.3V, 500mA regulator high efficiency

    Thank you guys. I'm going to use a switching regulator so I can reach a efficiency higher than 65%! Thank you. :-)
  14. R

    Looking for a 5v to 3.3V, 500mA regulator high efficiency

    Hi all, I would like to receive your suggestions for and simple 5v to 3.3V regulator with output of 500mA, high efficiency and within DIP or TO packages. DC-DC converters with inductors are not welcome. :D I found MAX604, but I think it is too expensive (about $ 4 per unit). Any...
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    Overcurrent protection for 4-20mA inputs

    kumarghz, Thank you for your suggestion! rprodrigues

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