Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Recent content by samuelr

  1. S

    Why are simple PCBs difficult to lay out in "High-end" PCB layout packages?

    Re: Why are simple PCBs difficult to lay out in "High-end" PCB layout packages? I have had PCB vendors visit the company to demostrate these high-end PCB routing softwares. They keep saying how easy it was to use. I even attended one of the seminars host by supposedly one of the best PCB layout...
  2. S

    Why are 1.5mm thick PCB not common?

    Hi I had someone request for a 1.5mm PCB. This is the first that I have even heard of it, but after some searching found that most in Europe seem to be prototyping with 1.5mm thickeess. Its just 0.1mm from the common 1.6mm FR-4 type boards. I am not sure if its just that they ignore the 0.1mm...
  3. S

    MOC30xx type isolators for 380Vac application (TRIAC firing)

    Klaus thanks, that is what I was looking to hear, just one small question where I am 100% clean on the term + how it affects my driver. The Output Repetitive Peak offstate voltage, I am unclear what this means and how it affects the IC. Does it mean even when the driver is not switched on the...
  4. S

    MOC30xx type isolators for 380Vac application (TRIAC firing)

    Hi All, Does anyone know if there are any MOC30xx or similar optocouplers available for 380Vac application. I am current using MOC3022 which has a output repetitive of only 400V which only allows me to fire my TRIAC at about 48 deg. sin angle. I want to be able to go 90 deg. which would be...
  5. S

    CT Design not clean on the signal end

    Hi All, I am trying to build an AC current monitoring device which would allow me to sample AC incoming current using a MURATA 1:100 current transformer. When I use the scope to see the signal I can make out the waveform of the lamp I am using as load but its not clean it has alot of noise...
  6. S

    Pulse transformer to drive scr circuit

    Hi I am trying to drive an SCR using a pulse transformer with the following circuit I got an MCU to swtich the MOSFETs are about 1 second interval repeated the total current to the transformer is about 200mA but there is no voltage on the output side. I am using a 1:1 78601/2C pulse...
  7. S

    How does a automatic self-test work on AFCI?

    Just wondering how an automatic self-test can perform and work on AFCI units. I can understand the push button test but for the unit to on its own create an arcing simulation or am I missing something here on the self-test part?
  8. S

    Ferrite Core d3,4/l3,2 -> What is this?

    Ferrite Core d3,4/l3,2 -> What is this? Hi I am trying to find the matching ferrite core all I have is this part number Ferrite core d3,4/l3,2 I am not able to locate it anywhere - - - Updated - - - OK, I think it should the following. Dia - 3.4 mm Length - 3.2 mm
  9. S

    2 x Current transformer what is the reason?

    Hi I recently saw an AFCI with 2 current transformer built into it. One of them had the Live wire going thru it the other smaller than the first had the the Live and Neutral. I am not sure why they have to sample the same current 2 times and what different would placing the L and N into the...
  10. S

    [SOLVED] Back EMF from relay resets MCU

    SOLVED. Actually its just I am using a smaller relay to switch on a bigger relay on the smaller relay there is a diode and snubber it works fine by itself. When I use it with the bigger relay it causes the MCU to freeze. I just added a snubber on that relay and the problem was solved...
  11. S

    DC/DC Boost converter with 95% eff.? GaN MOSFETs

    Yeah found that its not possible to get >90% eff. with this configuration. I will do 75V and see if I can just put them in series. It seems 75V has some solution with 97% eff. from Texas Instrument
  12. S

    DC/DC Boost converter with 95% eff.? GaN MOSFETs

    warpspeed, you are right using MCU is not wise with regards to safety features that a dedicated might be able to handle with a great degree of reliablity. However, I am havnig some difficulty to find a boost that is able to do 150V boost without a flyback configuration do you have any...
  13. S

    [SOLVED] Back EMF from relay resets MCU

    Hi I have a problem with back EMF from a relay. But when its not connected to the 220V devices the MCU will not freeze. I have tried using snubber and diode combo to try to cut it down but there is still the problem persist. I am thinking if I were to sample the current from the 220V line and...
  14. S

    isolated voltage measure for array of solar panel

    You might want to use an isolated power supply like MURATA Isolated DC/DC for the power supply to the which will make the design simpler.
  15. S

    DC/DC Boost converter with 95% eff.? GaN MOSFETs

    As for the diode I am thinking of using SiC (silicon carbide) and the MOSFET GaN. This would prehaps help is increasing the eff. slightly. Yes 150Vdc is higher than most common boost voltages. I was seriously considering doing the control using an MCU do handle the switching I still unsure if...

Part and Inventory Search

Top