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  1. (*steve*)

    LED driver - critical match?

    This type of driver is used for LEDs without inbuild controllers These are likely to have their own internal driver. All you need for these is a 12V power supply as mentioned above. In this case, the voltage needs to match and the total of the current (or wattage) must be less than or equal...
  2. (*steve*)

    Sciaky model C.R.O.I. what is it?

    Yeah, the crt is about 1 inch in diameter.
  3. (*steve*)

    Load cell + hx711 = drifting value

    Yeah, I was thinking creepage or a lack of stability over minutes as opposed to seconds. Your description seems to eliminate this, but it also points squarely at your test method (with the spring) as being a major contributing factor. Is there any way that some load could remain on the spring?
  4. (*steve*)

    LED driver - critical match?

    Many led drivers are constant current supplies. It is important that you match the load to the power supply. Such power supplies will typically have a minimum voltage output (that defines the minimum load that can be correctly driven), and a maximum voltage that represents the maximum load. A...
  5. (*steve*)

    Computer monitor power issue

    Unfortunately, I have seen it both ways. It's best to note the polarity when you remove the old capacitors.
  6. (*steve*)

    MPP inverter fault

    My first option would be to contact MPP Solar. They appear to have an Australian presence and would be a logical first choice.
  7. (*steve*)

    Load cell + hx711 = drifting value

    Is there a difference in how the load is applied in the two cases? I'm thinking that one sounds like a slowly applied load that is held for some time before release vs three other where you just apply a weight, measure and release.
  8. (*steve*)

    Hand on the loading coil

    Nooooooooooooooooo! Yeah, it was a great place to visit and you were the perfect host. And those bits and pieces got shipped back to Australia. No, I didn't go to see Elton when he was here, but I swear I could hear it from where I live (about 5 miles away).
  9. (*steve*)

    What do you look like?

    According to a machine learning algorithm I look something like this: Those who have met me might recognise me better here: :-)
  10. (*steve*)

    I think I'm starting a collection

    And another one And it's made in Australia!
  11. (*steve*)

    Low noise power supply - linear?

    I've looked at a number of designs for pA meters. There's more issues than just ripple, you want to avoid noise coming from all sources. Batteries can be contained within a shielded enclosure, once you go to mains operation, you note need to filter the noise coming in through your power supply...
  12. (*steve*)

    controlling amplitude of LED osc

    @Audioguru I think the use of an emitter follower may be a feature rather than a bug. @ke4cpc Rather than use two capacitors, you could replace C1 with a 1uF nonpolarised cap, and change R4 to something like 1M. The maximum brightness will be affected by the supply voltage. As pointed out...
  13. (*steve*)

    isolating transformer and variac - what order?

    Believe me, they're really hard to get here. I have resorted to buying some from China. I'm generally stuck with weird bases like E27... Many of the ones available here are the halogen type that are considered "efficient", and which (apparently) don't like operating at reduced voltage. Some...
  14. (*steve*)

    MOSFET interchangeable

    I think it's worth a try. The 4AK19 seems to be a little inferior to the UPA1560H in some respects, and slightly better in others. They seem to have the same pinout, so it should be an easy replacement.
  15. (*steve*)

    Sciaky model C.R.O.I. what is it?

    The tube is shielded, but that CRT looks to be in the ballpark for size. When I first saw a picture of this, I assumed the dimensions we're about twice what they turned out to be. Even then, I thought it was a tiny display. When I pulled it out of the packaging I was quite surprised.
  16. (*steve*)

    Capacitor Knowledge Wanted

    Photos of another unit would probably suffice.
  17. (*steve*)

    Sciaky model C.R.O.I. what is it?

    Here's my latest find. It looked interesting, but I don't know anything about it. It's 15.5 x 11.5 cm (x 11.5cm deep). Probably made in Australia. Capacitors are a mix of British and Australian made. Contains 2 x 6AM6 tubes and the display tube (so far unidentified). No obvious...
  18. (*steve*)

    What is this style of pin called?

    Those are definitely custom parts. Also the chips used in these calculators are profoundly static sensitive. Unless you've taken every precaution while handling the boards, your calculator is likely now dead. In working order, these are pretty pricy items, and many work as good as they did...
  19. (*steve*)

    Capacitor Knowledge Wanted

    The electrolytic capacitor you show is a nichicon. Nichicon make really good capacitors, the one you removed, even if degraded slightly may be better than what radio shack stock. I'd be looking at brands like nichicon, United chemi-con, Nippon chemi-con, Panasonic or rubycon. I'd also be...
  20. (*steve*)

    Capacitor Knowledge Wanted

    Use an image compression tool (I use LitPhoto on my phone) to reduce the side of the images. I set the quality to 80% which reduces the size of the file dramatically.
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