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  1. (*steve*)

    XCS15W Board trouble reading .1 volts testing this transistor

    That's an STPS30M60, a schottky diode. Reading a voltage drop of 0.1V at low currents is perfectly reasonable.
  2. (*steve*)

    Wayne Kerr 3245

    I have one of these on the way to me. I'm not sure of its operational status. Perhaps we can work together? If the faults are different (or my unit is functional) we may be able to compare results.
  3. (*steve*)

    240V ac LED bulb failure

    Must be a good batch. I've only bought 2 of them any they are the brightest build I've ever used. No flicker that I've noticed.
  4. (*steve*)

    555 output to transformer failure

    The internal resistance will rise as the battery goes flat.
  5. (*steve*)

    Adding PWM speed control to Linear Actuators for TV control

    I'll try to draw up some circuits for you later today.
  6. (*steve*)

    Adding PWM speed control to Linear Actuators for TV control

    Firstly, PWM will give high torque at low speeds, so you should be able to do a slow or soft start. There are many ways to detect the motor current. There are simple hall effect current sensors, or you can use a current sense resistor. With a sense resistor you can use an op-amp to amplify...
  7. (*steve*)

    Can I Connect a DC-DC step up converter to a USB powerbank?

    That camera will be fine powered on for ever :). They can get a bit warm if you do extended video or continually fire the flash
  8. (*steve*)

    Can I Connect a DC-DC step up converter to a USB powerbank?

    Sure.
  9. (*steve*)

    I need a really small, really smooooth motor...

    Another option to reduce jitter if you're using a non-ideal motor is to increase the mass of your disc.
  10. (*steve*)

    Adding PWM speed control to Linear Actuators for TV control

    Pwm speed control is pretty simple but you need to consider how you are going to do the control. One simple means is to operate the motor at low speed the entire time until a limit stop is reached. A second way is to operate the motor at full speed until a sensor says you're almost there, then...
  11. (*steve*)

    Finding Nodal Voltage! Why make a Division?

    Can you post the actual question?
  12. (*steve*)

    Finding Nodal Voltage! Why make a Division?

    Ok, so you probably didn't :(
  13. (*steve*)

    Power Dissipation in a simple circuit

    open drain? Do you mean open collector? If there's no load, you've essentially got 5v across a resistor and a diode.
  14. (*steve*)

    Finding Nodal Voltage! Why make a Division?

    Did you notice the similarity between the 8 ohm resistor and that dependant current source?
  15. (*steve*)

    Finding Nodal Voltage! Why make a Division?

    Juan, have you solved that earlier problem yet?
  16. (*steve*)

    LM317 2N3055 Variable Circuit Problems

    Congrats Do you have the datasheet for that device? You have to satisfy the input requirements, the output is frequently activated and there is very little control. :)
  17. (*steve*)

    Microcontroller project for my pool pumps

    Contactors are designed to switch higher power at higher voltages than relays. If your load is inductive and a reasonably high power then the contactor is a safe option. Measure the resistance of the coil of the working contactor and then measure around the various connections on the other one...
  18. (*steve*)

    Microcontroller project for my pool pumps

    Just wondering if I've missed you actually confirming your transformer can power the second contactor on its own? I'd hate to think you were accidentally using the wrong terminals. Contactors and relays are different in many respects. The power required to switch a contactor, while large...
  19. (*steve*)

    Comedy Thread

    I have read the last few posts to my wife. She says "You can hire me out". Be afraid. Be very afraid. Things will be so tidy it will take weeks to get your stuff "organized" again. If you're interested, you must provide lots of labels as well as ice cream and handbags.
  20. (*steve*)

    Parallel Circuit with current source and dependent current source. HELP!

    Juan, the 2 ohm resistor and the 8 ohm resistor connect to the same nodes. Therefore the voltage across them is the same. For a current "i" through the 2 ohm resistor, the voltage between the nodes is 2i. If the voltage across the 8 ohm resistor is 2i, and the current through it is the...
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