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  1. (*steve*)

    Oscillating Leds circuit anywhere?

    Look at our resource on LEDs. It should answer your questions about how to use LEDs in a circuit. 450nm (not NM) is blue, 600nm is amber or orange so you're talking about a wide range of colors.
  2. (*steve*)

    how the Web server read and execute php file?

    You would be better off asking on a relevant forum. The simple answer is that it passes the file to PHP.
  3. (*steve*)

    Soldering iron

    I wouldn't recommend it. Many plastics release nasty chemicals when heated. It can cause your soldering iron to smell of plastic for quite a while, but it won't stop it getting hot (which is what would stop it from melting solder) You should be able to clean the tip. At worst you could...
  4. (*steve*)

    how the Web server read and execute php file?

    It has help from a PHP interpreter.
  5. (*steve*)

    broken cable of charger

    Sure. The simple way is to cut the cable, remove some insulation and join the wires that should be joined together. Rejoining the wires is pretty simple if they're colour coded, but if they're not... I would advise you to carefully dissect the cable where it has broken and carefully note if...
  6. (*steve*)

    Capacitor to smooth rectifier output?

    Interesting. However it pretty much defies mathematics. You'll get a series of pulses that reach a peak of around 330V but have the same heating effect as DC as 230VDC (actually a very small fraction less -- probably no more than 2V less)
  7. (*steve*)

    Capacitor to smooth rectifier output?

    My first thought would be to use simple rectified (using a bridge rectifier) AC and no filtering. Try using a lamp dimmer to control the speed. If it runs way too fast then half wave rectification may be a better start (since you say you want it to run slowly). The peak value of 240VAC is...
  8. (*steve*)

    fairchild mosfet taken from Mean Well TN 1500 inverter.

    Not mad, just confused. If we're not understanding each other then I can't help you and you may get bad advice. I really don't want to give you bad advice :)
  9. (*steve*)

    LM741 amplifier

    The 741 will not know or care whether it is operating from 0V/24V, -12V/+12V, -24V/0V, or even -400V/-376V. If you maintain (say) a total of 24V difference between the supply rails and keep all the pins within other values relative to these you'll be fine. HOWEVER quite often you will require a...
  10. (*steve*)

    Capacitor to smooth rectifier output?

    Yeah, most of us would have little knowledge of (presumably) automated devices for planting seeds and their power requirements. A general rule of thumb for low voltage rectified AC is 1000uF per A of load current. However this simply gives an amount of role which should be easy enough to handle...
  11. (*steve*)

    fairchild mosfet taken from Mean Well TN 1500 inverter.

    Assuming they are genuine, they look to be ideal replacements. As previously stated we don't know if this is all that is wrong with your device, but the replacement transistors seem cheap enough to give it a go. In addition you'll have spares if it turns out there's other things to fix and you...
  12. (*steve*)

    fairchild mosfet taken from Mean Well TN 1500 inverter.

    What, you want to repair this but not use it to power anything? Loads are required in order to test that it can deliver power without failing.
  13. (*steve*)

    Playing with valves

    I've been playing with some funny evacuated glass tubes. And I've been starving their anodes! These graphs are a bugger to do manually.
  14. (*steve*)

    need help regarding tilt alarm

    Check out G sensors. You can get three axis devices that are accurate to a part of a degree. All you need do is connect one to a microcontroller and after you have "set" the initial position it can be programmed to generate an alarm if there is a deviation beyond a certain point. How good are...
  15. (*steve*)

    fairchild mosfet taken from Mean Well TN 1500 inverter.

    If you can get hold of these, then it's worth a shot. I'll have to go back over the thread to see what I meant by a "low power test". Meanwhile... how long would it take you to get these? edit: OK, not much more information. NOTE: in most cases the way to replace these is to mount them on...
  16. (*steve*)

    Clocking between 4 pins

    true, once I figured out what was required, @Gryd3's solution of using a 4017 (as an example) and utilizing every second output is a good one. Note that you will want to connect the 9th output to reset to cause the sequence of 4 outputs to repeat correctly.
  17. (*steve*)

    What is this

    Remonco International?
  18. (*steve*)

    What is this

    Hmm, not true about the ports. One per card, just different spacing and not physical located on the cards. I'm having a hard time reading the company name and other details from the photo.
  19. (*steve*)

    What is this

    wow. It is certainly devoid of useful markings. The one thing we can tell is that there are more slots than there are DB9 connectors on the rear cover. googling the assembly number might yield something (I'll try that in a minute). if nobody can come up with anything definite, the next step...
  20. (*steve*)

    How to draw this?

    I'm afraid I'll have to give up. I really don't understand what you are asking for.
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