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  1. (*steve*)

    Which gas solder

    Removing it is only a small part of the problem. Presuming you can do this without removing other nearby components, you need to clean up the board and solder another one. Even with industrial techniques, there can be a significant failure rate. As difficulty factor goes, this is a quadruple...
  2. (*steve*)

    HP 54510A Power Supply Smelling

    That's very interesting. Have you measured diodes on your multimeter before? Does it have a diode range? But that won't help with the problem you're having now. I'll have to go back to the circuit diagram and look at it again.
  3. (*steve*)

    Which gas solder

    Looks like a BGA chip (and a large one too). You may be applying a force to fecal matter in order to increase its elevation on a geographic feature.
  4. (*steve*)

    Port On The Back Of Automotive Oscilloscope

    Can you show us a picture. Preferably also show us a picture or give us more information so we know what a "1080 oscilloscope" is.
  5. (*steve*)

    LEM HLSR 10P current sensor

    Another option is to use a bridge rectifier and pass pulsed DC through the sensor
  6. (*steve*)

    Wanted: Anybody Near Weston-super-mare

    What country are you in?
  7. (*steve*)

    how to prevent simple AA battery electromagnet short circuit/overheating

    Well, you could use a fuse. The alternative is a resistor, but you will need to learn how to calculate an appropriate value. In addition this will pretty much render the the device useless as an electromagnet. The "appropriate" resistor will vary with the resistance of your coil, the battery...
  8. (*steve*)

    Need some help with this motor control board

    If the screws are metal, and if they touch any met all on the device and the heatsink you will get a short to the heatsink. In this case there is normally a small plastic insulator which looks like a washer, but has a ridge which fits through the hole on the devices mounting hole, preventing...
  9. (*steve*)

    Lowest power possible for driving segment LCD glass with accurate time

    I would guess the lowest power would be a function of leakage, capacitance, and frequency. The first two would vary from panel to panel, the last of under your control, but limited by the panel. Have you viewed any datasheets?
  10. (*steve*)

    Which gas solder

    The air I use is about 70% nitrogen. This isn't really important, but if the cheapest I could find. Seriously, you need to tell us what you want to do, and why. Some of the devices are almost impossible to solder at home, others are almost trivial. For anything even slightly complex...
  11. (*steve*)

    HP 54510A Power Supply Smelling

    2mΩ, or 2MΩ?
  12. (*steve*)

    100G ohm resistor only measures 50G ohm

    I'm making.... sure that the electrometer is working :) Testing the resistance ranges of the easiest, and high value resistors are not too expensive. At the moment I'm just having fun playing with, and in some cases repairing, the equipment I've bought. And because it's a hobby, I don't have...
  13. (*steve*)

    100G ohm resistor only measures 50G ohm

    I got my brand new 100G ohm resistor (it's sealed in an evacuated glass envelope) and it measures only 50G Ohm!!! What could be the problem? If I disconnect the coax with the alligator clips on the end, it measures (open circuit) 100G ohm. If I disconnect the coax, it measures something in...
  14. (*steve*)

    Chinese amp with dual positive rail!?

    You could connect the +ve of one to the -ve of the other. That join is 0V. The free +ve lead is +12V, and the free -ve lead is -12V. Note that this means there is 24V between -12V and +12V (which is correct).
  15. (*steve*)

    LEM HLSR 10P current sensor

    Is the device your connecting it to run from AC? If so, the average output will be 2.5V, but it will vary equally either side of that value 100 times per second. If you're reading the value with a multimeter on a DC range you won't see this. On an AC range your meter may read it (a lot...
  16. (*steve*)

    Can you help me with capacitor's code?

    Possibly an Nichicon polymer capacitor. It is an 820uF 3V capacitor 5K *may* mean it's 5000 hour rated.
  17. (*steve*)

    SMD components question.

    The manufacturer knows... There are some "codebooks" which list packages, codes, and known devices using those codes. Often it's pretty simple. If the options are a zener diode or a transistor, differentiating them is reasonably easy. It's more of a problem when the list of possibilities...
  18. (*steve*)

    Getting antenna to radiate

    Try changing the collector resistor to a 100 ohm resistor. Whilst it's not ideal, it will have an impedance much closer to that of your feedline. Oh, and beware that your resistor may have significant series inductance and parallel capacitance due to the helical nature of the resistance trace...
  19. (*steve*)

    Getting antenna to radiate

    One thing you have here is a class A amplifier. Most RF amplifiers are class C. Taking the output from the emitter will limit the voltage swing from your amplifier. If you have a tuned circuit as yout collector load the output voltage swing can exceed the power supply voltage. 145MHz is...
  20. (*steve*)

    Need Experts Advice On Soldering Irons

    Yes, the closer the source of heat and the measurement of temperature is to the tip, the better the iron will be able to maintain temperature. The higher the power, the faster the iron will be to respond, and the greater the energy you'll be able to transfer to the joint once the heat required...
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