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  1. Rleo6965

    DIY PCB

    Do you have this in Malaysia. Its cheap.:)
  2. Rleo6965

    DIY PCB

    Almost like solder mask. But with Lacquer Varnish or Plastic Varnish ( we call it here in Philippines ). You can still solder on copper etch even coated with Plastic Varnish. What do you use for coating copper of pcb? I just remember. You look like one of my engineer.:D
  3. Rleo6965

    DIY PCB

    Oh. The guy in the left.:D How come you did not show that you have to laminate the finished pcb w/ Plastic Varnish to avoid finger print mark on PCB etch that will cause corrosion?
  4. Rleo6965

    DIY PCB

    Are you one of them? :) TDA7000 was right commenting that you need have thicker or wider traces, specially with the Supply etch and ground etch pcb. This will avoid electrical noise in your circuit with high current and fast signals. such as DC DC Inverter. Tracing such noise problem...
  5. Rleo6965

    Variable power supply

    If your new in electronics. Go for analog variable power supply project. It s simpler but bulky.
  6. Rleo6965

    Variable power supply

    Are you going to use it for your electronic projects? You will need current limit.
  7. Rleo6965

    help please, how to send data using AT commands?

    Its also better to connect DTR and DTS pins.
  8. Rleo6965

    PIC development board

    What programming language your going to use?
  9. Rleo6965

    DC-DC Converter Design

    If dc to dc inverter running at higher frequencies. You use multiple strand wire instead of single solid conductor for transformer winding to reduce skin effect.
  10. Rleo6965

    IC 555

    Same path but should be opposite direction or arrow.
  11. Rleo6965

    IC 555

    Don't mind the arrow.:)
  12. Rleo6965

    IC 555

    Ha ha ha:D
  13. Rleo6965

    IC 555

    Discharge current path
  14. Rleo6965

    IC 555

    This is my first time see such diode placement in NE555 circuit. :) But steve gave the accurate answer.:)
  15. Rleo6965

    IC 555

    Hmmm. It does'nt make sense to me. Diode was reversed biased and this will not do anything w/ + 1/3V VCC.. That is, capacitor was already charged and Timer Output was High voltage Level to control something. :) Probably a discharge path for the capacitor if Timer was power off. :rolleyes:
  16. Rleo6965

    IC 555

    http://www.techdose.com/electronics/Using-a-Logic-Probe/395/page1.html Buy Logic Probe that can be use in 5V to 12V supply. Can catch and store one time pulse. Have small switch to select TTL and CMOS level signal. If possible have two tone signal to identify Hi and Low Signal. You need to...
  17. Rleo6965

    IC 555

    :D How about Logic Probe. Its cheaper. I'm sure you can afford this.:)
  18. Rleo6965

    IC 555

    Made in China was cheaper. http://www.amazon.com/Rigol-DS1052E-50MHz-DSO/dp/B001VK4TI2. I can't find lower bandwidth than 50mhz. This is cheap but good brand.:)
  19. Rleo6965

    IC 555

    @vick5821 Being a newbie in electronics. There are too many information you want to learn and sometimes leads to confusion. I suggest you build those simple project and observe inputs and corresponding output basing from tutorials or instruction. If you can afford to buy Digital...
  20. Rleo6965

    IC 555

    I should not have mentioned op amp.:D
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