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Recent content by melc

  1. M

    [SOLVED] Can't Reprogram PIC16F628A with Pickit2

    Brian, you shuldn't, but I've just did. On PIC16F628 (not A) that location is scrambled by Pickit2 during bad programming. Once is erased ( reading the memory content with other software such IcProg) you can see the content FFFF. Icprog is able to rewrite that location, once is written Pickit...
  2. M

    [SOLVED] Can't Reprogram PIC16F628A with Pickit2

    Hi there, This is the right solution for a closed thread named "Can't Reprogram PIC16F628A with Pickit2". The PICKIT2 (or PICKIT3) is reading the ID of the PIC16F628 which is located at the address 2006h. The correct value you should see at address 2006h is 07C0h. If by mistake that value was...
  3. M

    Tesla TM392 Q-meter 1951

    Hi all, I'm searching for the operating manual of an old Q-meter (30KHz-30MHz), Tesla TM392, perhaps it has 16 pages, published in 1951. I need only the oscillator section (UBL21 tube). thank you!
  4. M

    [SOLVED] SOP-16, Half Pitch Mini-Flat Package

    The first step in a PCB project is creating the library package, by modifying other existent library. You should start learn this because someday you will find one package which has not been edited yet on Eagle by anybody else. Please read documentation: **broken link removed** win 200 euro...
  5. M

    where to begin learning electronics?

    This question is demoralizing any guy which 25 years was playing with electronics...including me. You like or not, the "Electricity and magnetism" chapter from physics must be read and understood. During this read, start practical activities: soldering, understand the electronic components and...
  6. M

    Win 200 euro (IJPE call for papers)

    Dear Colleague, International Journal of Practical Electronics wishes you love and health for 2014! https://www.sciencepubco.com/index.php/IJPE Joyfully win EURO200 for the best accepted manuscript (research or technical article) submitted to IJPE till 30 January 2014. The paper should discuss...
  7. M

    mentor graphics pcb tools

    is pads pcb hard to learn Quality board if qualified personell are using those, else... big sh*t.
  8. M

    HOW TO MAKE PC VOLTAGES AND MICROCONTROLLER VOLTAGES SAME

    Re: HOW TO MAKE PC VOLTAGES AND MICROCONTROLLER VOLTAGES SAM Please ask a good question and you've got a good answer. How the heck you want the reader knows what are exactly your voltage levels? Every problem may have a particular solution. Ask yours again.
  9. M

    Oscilloscope circuitry - help needed

    check oscilloscope offset This is a too complicated chopper for a logic analyzer, however seems OK, except maybe the output DC level converter. The output "fixed current source" is a variable current source driven by the logic signals.
  10. M

    What's the use of CCP mode and PWM mode in PIC16f877a?

    Re: PIC16f877a Both the CCP and PWM must be understood as hardware standalone modules which properly programmed can perform tasks in the same time your instructions in the firmware are executed. One example is generating a 50% dutycycle of a KHz signal with the PWM while a 1mS real time clock...
  11. M

    Regarding, to calculate the max length of the track.

    In a few words: Any track is creating an attenuation and it's adding a delay. A track for a high speed design could be microstrip or stripline (simmetrical or not), coupled or not. A free program which is computing attenuation and phase shift for a given track is here...
  12. M

    Increasing wattage of a SMPS circuit

    500w smps 회로도 Read datasheet. There is one usefull output 35V. FBO is a voltage used for a microcontroller AD measurement and REG is the feedback that microcontroller is providing for modifying the output voltage. SBY is a standby input. It might be a 70W SMPS. About the trace routes you...
  13. M

    AD9834 DDS Function Generator

    dds function generator http://koti.netplaza.fi/~jonverro/ad9854.htm http://www.qsl.net/pa3ckr/ad9852/index.html http://www.qsl.net/pa3ckr/signalgenerator/index.html http://www.f6blk.net/main_en.php?page=77 AD9854 and AD9852 are very similar except the quadrature output for the second one...
  14. M

    MOUNTING OF SMD COMPONENTS IN RF CIRCUITS (MICs)

    **broken link removed** Instead of the toaster I'm using hot air. I've soldered SMD and TQFP running up to 5GHz. Will not work from the first try...

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