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  1. (*steve*)

    Frequency Response Heterojunction Bipolar Transistor

    When you reply to your own thread three times it makes it look like someone has answered it. Having said that, I can't help either.
  2. (*steve*)

    How fragile are diodes? Can you screw them up soldering them?

    If you take only a few seconds to solder each end you will do them no damage. The reading you get depends on what other components are around them in the circuit once you solder them in. On a resistance range if you see a higher reading one way than the other then they're likely OK...
  3. (*steve*)

    LED as a diode

    You might be able to get away with it, but beware that a LED has a very low reverse voltage. Also beware that relatively high current pulses (300mA) will pass through the LED which could shorten its life. It's hard to know how the LED will eventually fail, and whether that failure will cause...
  4. (*steve*)

    LM358 one opamp fails Please sugest what to do..

    Then you should remove the earth symbol you show in the schematic :-) (unless it's required to make the simulation work).
  5. (*steve*)

    LM358 one opamp fails Please sugest what to do..

    Does the input float with respect to the ground of your power supply? Looking at this circuit, it should. If it doesn't you could have problems.
  6. (*steve*)

    Is BB code general use or made specifically for this site?

    BB probably stands for "bulletin board" and bb code is supported by the software this site uses. I'm sure it's not unique to xenforo as I've used the same (or very similar) on sites that do not use xenforo.
  7. (*steve*)

    Help RGB LEDs Keep Blowing The Control Box

    You may be overloading the controller. Even if it seems to allow (say) a 15A load, it may not be constructed well enough to allow that continuously.
  8. (*steve*)

    Transformer / Charger, Back-draw

    Mostly no. If the charger has a LED indicating the battery is charging/charged and it stays on them you disconnect the power but not the battery, then there will be a very small load on the battery that will slowly discharge it.
  9. (*steve*)

    12v Wind turbine

    The problem is that there is a mismatch between the alternator, the blades, and the wind speed. (And it's largely an impedance mismatch) The alternator needs to run at a certain minimum speed to generate a useful voltage. Furthermore, it needs to be operating at a higher speed with sufficient...
  10. (*steve*)

    5 decade old battery pack bridge

    This circuit is dangerous. @tedstruk doesn't understand it, diodes or capacitors. I'm closing this thread because it's not only going nowhere, it's going backwards.
  11. (*steve*)

    Op-Amp Help

    That was with the 4mV input. Try again with the 4V input signal (or whatever was the larger value). Also, you should be able to increase the gain on the yellow trace so it appears larger.
  12. (*steve*)

    LiPo balance charger on electronic cigarette problem

    Measure the actual cells and tell us what you get.
  13. (*steve*)

    Op-Amp Help

    It also may be worth looking at the input waveform compared to the output waveform.
  14. (*steve*)

    while(1) statement

    I MEAN YOU NEED TO LEARN TO GOOGLE In C++ a number has a logical value. A logical value is also a number. 0 (zero) is False. All other values are True. 1==1, which is True, typically has the value -1. Generally speaking -1 (which is all bits set to 1 as a signed integer) is returned by...
  15. (*steve*)

    while(1) statement

    You could save yourself a lot of time by googling for the answer. Also @Amar Dhore is incorrect in his explanation insofar as his description of while(j==0) and the value of j required to make the loop continue (hint, it is 0)
  16. (*steve*)

    Understanding N-Channel MOSFETs

    In the datasheet you should find a graph of Id vs Vds for various values of Vgs. You normally (in switching applications) want to use the device in the triode mode (where the graph is steeply rising) rather than in the saturation region (where the graph is close to horizontal). The easiest way...
  17. (*steve*)

    Can you check over this Circuit?

    The UM3561 may not be easy to find either.
  18. (*steve*)

    Can you check over this Circuit?

    Why don't you describe to us what you think it does and we'll comment. I will say that the choice of an AC187 is very... old fashioned. It is a germanium transistor. Unless you have them on hand, finding them may be a problem.
  19. (*steve*)

    5 decade old battery pack bridge

    I recommend you do not work on this circuit. We do not wish death on you.
  20. (*steve*)

    ISO a particular switch. Don't know what it's called/to look for

    I think the idea is that the pump runs all the time so the animal sees this nice running water thing to drink from. We had one for our cats and the idea of making it run intermittently is a good thing. Switching mains power is not a thing for a beginner though, especially around water. The...
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