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  1. (*steve*)

    Create controlled 50v pulse

    I would investigate if the picaxe has a pulseout or simmilar command and read the documentation on it. Then I would use my power supply to set the voltage and current limits. Then I would use an n channel mosfet as a low side switch. Finally, I would use a gate driver to allow the mosfet to...
  2. (*steve*)

    Wanted: 2sk1058 mosfet

    Oh, that was silly of me.
  3. (*steve*)

    Wanted: 2sk1058 mosfet

    How about these
  4. (*steve*)

    Increasing data update rate of MPU9250

    Is your code (or the library) averaging several readings to help cancel out noise? This will slow the response.
  5. (*steve*)

    Wanted: 2sk1058 mosfet

    Here
  6. (*steve*)

    Wanted: 2sk1058 mosfet

    RS (rs-online.com) have 8 of them in stock.
  7. (*steve*)

    cap tester repair

    When you get back to this, maybe R6 should be looked at more closely. Sorry we were not able to assist you more.
  8. (*steve*)

    My next project? What do you think?

    The only place within 400km or so of me no longer stocks it :-( I may have to shop around :-)
  9. (*steve*)

    My next project? What do you think?

    That seems to be fairly difficult to get here. I do like that it's compatible with electronics though. There seems to be both a corrosion removal (not safe for electronics) and a protection version. Does the protective version also act to remove rust? I see there are various options...
  10. (*steve*)

    My next project? What do you think?

    Will that remove rust without damaging the very fine parts in the vicinity? That entire image shows a section about 1cm across. Do you have any suggestions of what rust remover I might use? I guess application with a very small paintbrush would allow me to get it just where it's wanted.
  11. (*steve*)

    My next project? What do you think?

    Warranty voided! The problem looks simple enough. There is some corrosion that the moving coil brushes against as it gets near full scale deflection. Do you think it's possible to scrape away at that rust without either damaging the movement or getting the rust stuck against the magnet? I...
  12. (*steve*)

    My next project? What do you think?

    Well, it only takes the removal of 14 screws and desoldering 2 joints, but the meter is out! It's complete with a QA sticker and an "individually calibrated" sticker. I wonder what I will find inside? And I guess this is going to void the warranty, right?
  13. (*steve*)

    Power drain on cr2032 battery

    Take the battery out when you're not using it. That may be easier than fitting a switch. The receiver needs to be powered up to be ready to respond to you, and that takes power.
  14. (*steve*)

    My next project? What do you think?

    Well... The meter movement works. Up to a point :-( At about 80% of the deflection, something starts rubbing. If forced a little further, the movement sticks, although a tap on the front of the meter frees it up again. I used my meter in the ohms and diode check ranges as a quick and dirty...
  15. (*steve*)

    My next project? What do you think?

    Very good point. I'll also do some basic checks on the transformer.
  16. (*steve*)

    Once a minute chirp...

    They are still widely used in the modular synth arena. LEDs (typically red or white) used in combination with one or more CdS LDRs create a form of optocoupler with one or multiple outputs. These are typically used to control gain of op-amps, or frequency of filters/oscillators. These are...
  17. (*steve*)

    My next project? What do you think?

    Fun may be the best reason. Any reward is going to be something other than financial. I've been skimming through the manual (on my phone -- urgh!) and it seems all the transistors are germanium. There's also lots of "high tolerance" resistors (1% carbon composition) with unusual values like...
  18. (*steve*)

    cap tester repair

    I wonder what condition the switch contacts are in after so many years? I don't suppose you have any contact cleaner? I watched a YouTube video of someone building a Heathkit project. They discovered that quite a bit of work was needed to get some of the switched working. The same issue...
  19. (*steve*)

    My next project? What do you think?

    Wow, there's some very interesting design aspects of this meter. It uses neon bulbs and light sensitive resistors to control modulation and synchronous demodulation to (I think) allow the use of an AC coupled amplifier to amplify the input signal. Here is a manual.
  20. (*steve*)

    My next project? What do you think?

    Here's a view in the top. The ceramic cap has a lovely pattern on it, probably from stuff falling in through the ventilation holes. I can only see a single tube, and the shield on it looks pretty rusted. Oddly enough, that's all that appears significantly rusted. I think the chassis is...
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