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  1. (*steve*)

    Determine the unknown voltage in an ideal Op-Amp circuit

    @Herschel Peeler PLEASE do not give answers. This forum is to help people, not to spoon feed them. @LynneMac can you find op amp circuits with multiple inputs? This one has a name. What is the gain at each input?
  2. (*steve*)

    Cost of application training boards

    Well, ask for a quote immediately. With luck someone will be able to respond before you get a reply, but if not you will get a response eventually.
  3. (*steve*)

    Cost of application training boards

    Why not go to one of the many sites which advertise them along with a link for you to request a price?
  4. (*steve*)

    Determine the unknown voltage in an ideal Op-Amp circuit

    1) what is the name of this circuit? 2) can you write the equation for the gain at each input? that should be a good start.
  5. (*steve*)

    DIY Laser Tag

    oh, and modulation meant (in this context) turning the laser on amd off very quickly (perhaps tens of thousands of times per second) in a pattern which can be recognised.
  6. (*steve*)

    DIY Laser Tag

    A microcontroller is essentially a small computer on a chip that you program to do clever stuff like interpret the readings from sensors, count "hits" and control flashing lights etc.
  7. (*steve*)

    Solar System ( Panels + Buck ) doubts

    in an MPPT controller the buck regulator is controlled so as to achieve maximum power to the load. A simple way is to maximize the output current. This works when charging batteries because the output voltage can be considered as fixed. Note that this CANNOT be done with simple feedback as at...
  8. (*steve*)

    Solar System ( Panels + Buck ) doubts

    A buck regulator draws whatever current it needs to in order to supply the power demanded by the load. If the input voltage falls, the demanded input current rises. An MPPT regulator determines the maximum power it can draw from the source and dumps it into the load. The practical upshot is...
  9. (*steve*)

    555 IC not amplifying enough

    Perhaps a statement from @Electro132 telling us what he wants to do rather than a description of how he is trying to do it would help us?
  10. (*steve*)

    555 IC not amplifying enough

    I think the issue is that a 555 is an oscillator, not an amplifier. Failing to see it amplify is kinda expected. Perhaps what you want is not actually amplification. I have tried to understand what you actually require, but I'm not at all certain I understand.
  11. (*steve*)

    DIY Laser Tag

    several things to consider: you need to modulate the laser. You could use a single modulation, one per team, or even one per weapon. with a modulated signal you can design a far simpler and sensitive input circuit. All of the processing can be done on a microcontroller. also consider that...
  12. (*steve*)

    Solar System ( Panels + Buck ) doubts

    oh, and i would say that neither is correct.
  13. (*steve*)

    Solar System ( Panels + Buck ) doubts

    A buck converter will not work (properly) with solar panels. You need something which does MPPT or even a linear regulator.
  14. (*steve*)

    Exam question help please?

    That assumes the annotations are wrong, that the battery voltage is suitable for the lamp, that the resistor value is high enough to keep the lamp looking "off", and that the switch can carry the required current. ignoring the last one, they are all reasonable enough to consider when addressing...
  15. (*steve*)

    How to draw this?

    @ElectronicsR, is there any reason you have 2 logins?
  16. (*steve*)

    Exam question help please?

    If the schematic forms part of the question, and especially if the annotations are not on it, you should either mark it as correct for any and all answers (including no answer), or remove it from the exam and adjust the marks as if there was one fewer question. I would also feel sympathy for...
  17. (*steve*)

    Exam question help please?

    one of the problems is that the symbols do not match the labels. Fix that first or we'll be giving answers that require some interpretation that may differ from person to person.
  18. (*steve*)

    Exam question help please?

    I agree. It has several problems
  19. (*steve*)

    How to draw this?

    because it makes the math work.
  20. (*steve*)

    Oscillating Leds circuit anywhere?

    ok, maybe look up a circuit using a 555 to flash a blue LED.
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