jippie

Eindhoven, Netherlands

wirespeed.xs4all.nl/mediawiki

Age: 45

Do you love your Pets as much as I do? Check the Q&A proposal!

I'm into:

  • Linux;
  • Networking;
  • IT Security;
  • Perl;
  • System integration;
  • Arduino;
  • ATtiny & ATmega Microcontrollers;
  • Analog electronics;
2h
comment How long will it take to kill a MOSFET with heat?
I like this article on power MOSFETs: mcmanis.com/chuck/robotics/projects/esc2/FET-power.html
2d
comment How a 8 bit Computer calculate big numbers
In school you learned the digits 0-9, but I bet you know how to count further than that and even do some basic calculations top of mind. Ask yourself how you manage that, because the 'digits' may be different, but the method is exactly identical. The magic that you were probably not aware of is the 'hidden' 9th bit in the arithmetic unit called 'carry'-flag.
2d
comment How to control the current output from usb slots of computers?
Some but not all motherboards support to power on/off individual USB ports. The required operating support however has either never existed (I believe Windows) or has been removed from the kernel (Linux). In other words, you'll need some extra hardware to control your LED. For a beginner's level electronics and programming, you might like to search for 'Arduino'.
2d
comment How can I understand the interface to connect from motherboard to lcd display?
You are pointing us to an TFT LCD display, yet you mention you want to connect an LED matrix. You're question doesn't make sense, please elaborate. Manuals can commonly be found on the vendor / manufacturer's website.
2d
comment Why two resistors at Gate side of IGBT
also known as ringing due to parasitic inductance in driver-gate-source circuit and the gate capacitance.
2d
comment What does a PLC read if I have an unconnected input?
+1 In between the lines you are writing: "When in doubt, check the manual to be sure what kind of input you are dealing with".
2d
comment RC Delay circut
I doubt you can use a regular 555 for a 10 minute delay. At least you'd need a CMOS 7555 and a good quality non-electrolytic cap. I would personally use a tiny microcontroller for this, but I have the impression that those are a bit over OP's head at the moment.
Apr
22
comment How to assemble Solar panel part?
Local norms will apply to the inverter. Check with your power company. Ebay and Alibaba are not particularly good places to buy these things because you often can't verify these specific specs. Also if you state "big vendors like ebay and alibaba services is not available in our country", it might help if you told us what "our country" is.
Apr
22
comment Changing fan Speed of a 4pin PC case fan with a microcontroller
Let me try to get you organized a bit. What you need to know is that fans in these applications are rarely controlled by voltage. Depending on the exact type they may not change rpm with supply voltage at all. So how are they controlled I hear you ask. Search the Internet for "4 Pin Fan Connector Pinout" and you'll find information similar to this: allpinouts.org/index.php/Motherboard_%28CPU%29_4_Pin_Fan The last link on that page points to very useful information: formfactors.org/developer/specs/REV1_2_Public.pdf It explains PWM and how it is used to control your fan.
Apr
22
comment What does a PLC read if I have an unconnected input?
@AaronD "often", "generally", "except", "usually", "Some". So basically what you are saying is: "Check the manual."? You do make some valid points though, I would've upvoted the answer.
Apr
21
comment Tunnel diode I-V curve noise
I wouldn't be surprised if it is caused due to the negative dynamic resistance, which is a well known condition to start oscillations. There is very little info available though from just the single plot, not even the type of the equipment nor its settings. I'm curious what "mechanism" is used the measure such a curve.
Apr
21
awarded Popular Question
Apr
20
revised programmable clock generator vs frequency synthesizer
retagged
Apr
20
comment programmable clock generator vs frequency synthesizer
Hard to say without context, probably wavefrom or modulation. A clock is usually a constant frequency square wave. Can you elaborate where you found these two terms?
Apr
19
comment Mechanical Relay Alternative for Switch 15A at 120VAC
Server Error 404 - File or directory not found. The resource you are looking for might have been removed, had its name changed, or is temporarily unavailable.
Apr
19
comment Is it safe to treat a system downstream of a reverse-biased diode as de-energized?
I like the note on capacitive coupling.
Apr
19
comment RGB gets wrong values
This might be reusable.
Apr
19
comment e12-table - replace resistors
1200 + 470 = 1670, saves you a resistor ;o)
Apr
19
comment Working of 2 input AND diode register?
Vcc is a reasonably common abbreviation for your power supply voltage rail.
Apr
19
comment how the LIFX or Hue generate millions of colors?
Although technically correct, no sane person would be able to tell the difference between most of these million colors, especially as at any single moment in time only one color is mixed and emitted by the whole bulb. But it sounds good from a marketing persepective.
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