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  1. (*steve*)

    Could you help me solve this question? ( Mix of BJT and MOSFET )

    How far have you gotten so far? What sort of gain are you trying to measure? If you're completely stumped, do you know how to calculate the gain of the stage containing Q3?
  2. (*steve*)

    Amplifier project

    As far as I can tell your last two posts in this thread are the one on Jan 30 and this one today. If you have a look at the list of your posts, you may find something. You have posted in a similar thread, did you confuse the two of them?
  3. (*steve*)

    Connecting and insulating wires in high temp environments

    Use the correct crimping tool and connectors for the wire you're using. For really high temperature stuff, bare solid wire covered with woven fibreglass and kept physically separate from other wiring and the chassis. And yeah, using something with a higher melting point that the ambient...
  4. (*steve*)

    Powering one 12v device from two 12v sources

    Isn't the aux connector and the cigarette lighter powered from the same battery? In any case, if both supplies share the same ground, simply use diodes to isolate them from each other. These will drop between half and one volt depending on the current, but if you're powering a 12V to 5V...
  5. (*steve*)

    Microphone and camera using same power sounds like crap

    Depending on how the power is connected to the mic, it may not be possible to power it the way you intend. Do you know, for instance, if the negative supply rail is common with the output ground?
  6. (*steve*)

    Help, Please with hot wire foam cutter

    It's not a dead short, but it does present a low (and somewhat variable) resistance.
  7. (*steve*)

    Pioneer SA-505 clicking

    Pictures would be a good start, as would be an indication of where you are reading the voltage (and with respect to what). Also, if you could briefly describe the tests you did on the transistors, whether you removed them form the circuit to test them, and the part numbers of the transistors...
  8. (*steve*)

    Help, Please with hot wire foam cutter

    A PWM controller is like a very fast switch. It gives either full power to the load or switches it off. It does this very fast and with a controlled ratio between the time that power is applied and when it is not. Ignoring resistance in the controller itself, the current through the load...
  9. (*steve*)

    Conn Organ Component Identification

    The resistor was possibly there to allow a 12V lamp to operate from 25V. Can you show us a picture of the lamp and the resistor? There are several possibilities as to why the lamp is no longer working. It may be that the lamp failed, and then the resistor failed, or that the resistor was...
  10. (*steve*)

    Why was my thread tampered with ?

    The thread about these changes is here.
  11. (*steve*)

    Why was my thread tampered with ?

    What you are looking at is a pointer to your thread. Someone (and yes it will be a moderator) has determined that your thread is better placed in another area of the forums, and has moved it. So as not to inconvenience people who perhaps knew to look for it in its original location, a pointer...
  12. (*steve*)

    Microphone and camera using same power sounds like crap

    The variable 3 terminal regulators are designed to have both a low and a relatively constant current going through their adj pin. This is not necessarily the case with non adjustable 3 terminal regulators. The result is that the performance of a non adjustable regulator, when used this way...
  13. (*steve*)

    Hello!

    Howdy. Welcome to electronics point.
  14. (*steve*)

    Microphone and camera using same power sounds like crap

    Are you using switch mode regulators? They can be very noisy. Even with this, you can also have problems caused by ground currents.
  15. (*steve*)

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

    It depends. Will this crack allow moisture to enter? Condensation on the inside of the glass will reduce efficiency greatly. The individual cells can also be damaged by moisture. And obviously if there's enough water in that you can short cells out.
  16. (*steve*)

    OP amp guidance for newbie

    Analogread is a function that returns a value. Imagine for a moment that the function is simply the square of the number passed to it. And let's call the function "square" so we don't confuse it with the actual analogread function. Square(2) returns 4 Square(1) returns 1 Square(2-1) returns...
  17. (*steve*)

    Glowing LED Bulb - How Does Circuit Flow

    That's the whole thing about capacitors. No electrical connection to anything.
  18. (*steve*)

    Glowing LED Bulb - How Does Circuit Flow

    Current flows through a capacitive connection between you/ground and the bulb/mains. It's a very small current, but it's enough to make the bulb flow very dimly. The same thing can happen with a small neon bulb, such as those in screwdrivers that flow when touching something live.
  19. (*steve*)

    OP amp guidance for newbie

    You probably want something like Int diff; . . . diff = analogread(A1) - analogread(A0); digitalwrite(ledpin, diff > 2); The main difference is that you use analogread(A1 - A0) which means something entirely different to analogread(A1) - analogread(A0). The fact you read the values to...
  20. (*steve*)

    Step down transformer reference list?

    And if you're doing that, also consider that the mains voltage might vary +/-10% under relatively normal conditions.
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