Search results

Search Forums New Posts
  1. (*steve*)

    OP amp guidance for newbie

    It would help a lot if you didn't post an image of your code. try something like this: long lastMilli = -8000; int diff; init() { digitalWrite(ledPin, LOW); } loop() { diff = AnalogRead(A1) - AnalogRead(A0); if (diff > 1) { digitalWrite(ledPin, HIGH); lastMilli =...
  2. (*steve*)

    OP amp guidance for newbie

    There simple way is to have no delays, but to record in a variable the time the LED is turned on (store the current value of millis())., Then, instead of unconditionally turning off the LED if the result is less than 1, also check that the current millis () value is at least 8000 more than the...
  3. (*steve*)

    PSU advice

    Yep. The one that's not neutral... Or earth :-)
  4. (*steve*)

    Entering square bracket in text

    Phone too... Ωμ± Android 8.1.0
  5. (*steve*)

    Resistors in combination circuit help

    In my post above I should have said the method I would have used seems simpler and easier to me. I don't think it's the easiest, but that doesn't necessarily apply to others, and it clearly doesn't apply to you :-) People find different methods easier or harder, and finding a different way to...
  6. (*steve*)

    Integrator and Voltage Follower Testing

    Presumably you'll be using op amp's configured as voltage followers or integrators. Do you understand how op amps work?
  7. (*steve*)

    Can this PCB section be salvaged? Beginner struggling...thanks

    I'd really like to emphasise that while there is equipment better suited to some tasks, there is nothing that replaces skill. I always recommend a double flat tip (like a screwdriver) over a conical tip. My party trick (and you haven't lived until you've been to one of my parties) is to hand...
  8. (*steve*)

    Entering square bracket in text

    Well spotted! array[i] That works too, great. array[i][[plain]/plain]
  9. (*steve*)

    PSU advice

    The lamp should be in the active line. Connect the Earth too. If the plug was inserted in the socket of the lead you are making, like pins (i.e. mating pins) should connect.
  10. (*steve*)

    Uninterruptible power supply ratings: conflict between VA and W?

    Adding to what @Ratch said. If the phase shift is 90 degrees, the power is zero, but too might be maxing out your VA rating.
  11. (*steve*)

    Resistors in combination circuit help

    I would certainly calculate the voltages. It seems the most simple and direct way.
  12. (*steve*)

    Pioneer SA-505 clicking

    When you originally tested the transistors the instructions told you how to distinguish NPN from PNP. I haven't been able to note the part numbers of those transistors because I'm using my phone. If they're not all the same then it's going to be non trivial to find out which one went where...
  13. (*steve*)

    Does a Minor Crack in a solar panel effect its Efficiency?

    As long as it remains sealed and the crack doesn't impinge the area above the cells themselves you should be fine. Even if the crack does impinge the cells, it's likely that it won't have a significant impact. Do you know what caused the crack? If it's caused by stresses from the mounting of...
  14. (*steve*)

    Powering one 12v device from two 12v sources

    I presume the camera doesn't use much power. I would grab a pair of 1N4001 diodes (actually 1N400x, where x is any digit). Wire a diode in series with the positive supply from each power source. The band on the diode should be at the end closest to your camera. As switches as necessary (they...
  15. (*steve*)

    Connecting and insulating wires in high temp environments

    There documentation for the connector should give you all the information you need. If these are cheap connectors with no documentation, then you're a bit on your own. I tend to use crimp connectors which have a hollow cylinder to place the wires in before crimping. Individual strands can't...
  16. (*steve*)

    Pioneer SA-505 clicking

    Did you take a photo before you too things apart? When you tested the transistors, were they a combination of PNP and NPN? Hopefully the relay not pulling in has helped protect the transistors.
  17. (*steve*)

    Pioneer SA-505 clicking

    It seems that the two pads highlighted are the ones used to energised the coil. If you replace the relay, what does the voltage across these points read? My suspicion is that it will be 0, or very close to it.
  18. (*steve*)

    Want the name of 2D game accompanied with the EFY CD

    Did you find their contact email address? Hint: it's on the FAQ page.
  19. (*steve*)

    Nichrome wire heating project. help please!

    That sounds like really thick nichrome wire. Do you know what the resistance per meter is? How much power so you need? What are you heating?
  20. (*steve*)

    Want the name of 2D game accompanied with the EFY CD

    Have you considered going to their web site and seeing if there's a way to ask them? Is it http://ezine.efymag.com/
Top