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  1. (*steve*)

    Fluke 8375A is not too stable

    My old Fluke 8375A is misbehaving. This might turn into a repair thread :) I think it has been getting worse, but yesterday the problem was so bad the meter wasn't much better than a 3 1/2 digit meter :-( The main problem was that with a reasonably high value resistance (10k to 100k) the...
  2. (*steve*)

    PM3055 Oscilloscope PSU failure (Don't leave your scope turned on)

    A great day. I have measured the resistance of the various resistors (including a couple of 0.01% and 0.005% resistors I have for calibration purposes) to get the baseline resistance of the wirewound resistors so I can try to measure their inductance. Then, as I prepare to wire up a signal...
  3. (*steve*)

    Measuring the inductance of a wirewound resistor

    One of my projects is to make a passive load. Sounds easy, right? And it is. Get some high power resistors (50W) attach them to a big heatsink, and Bob's your uncle. My load will have 5% 0.01, 0.1, 1, 10, 100, 1k, and 10k at 50W (except for 1R and 100R which will be 200W). And I thought --...
  4. (*steve*)

    My new toy

    I am now the proud owner of a Keithley 228 Voltage/Current source. Not exactly the newest piece of equipment on the block, but very useful for a lot of stuff I want to do. I've also picked up an Advantest R6441A bench multimeter. Perhaps I should be looking for an HP-IB (IEEE-488)...
  5. (*steve*)

    Sous Vide cooker, elasticity, and meat.

    From the thread https://www.electronicspoint.com/sous-vide-cooker-elasticity-and-meat-t267511.html#post1600674 For your discussing pleasure...
  6. (*steve*)

    laser ablation of PCB resist

    As mentioned in this thread (https://www.electronicspoint.com/home-made-pcbs-t267347p2.html) I am currently investigating using a laser cutter to ablate resist from PCB before etching. I have created this thread by request, I won't have any real information for another 12 to 18 hours.
  7. (*steve*)

    book recommendations

    I don't suppose you noticed this thread? https://www.electronicspoint.com/book-reviews-t251799.html
  8. (*steve*)

    Accelerometer with 0.2mG resolution - seismography??

    I've just been gifted some old equipment. I grabbed it mostly for the very nice weather resistant metal case it was in. On taking it apart, I find that it has a sensor, an ADXL105, and whilst it's almost 15 years old, the technology seems similar to what is used in these things today. I...
  9. (*steve*)

    Replacing NiMh in phone

    I have a number of devices which use a pair of NiMH batteries. Clearly the charger is rubbish because the batteries get quite hot whilst on charge (which they are almost 24x7) My thought is to replace a pair of these batteries with a single 10440 LiFePO4 cell with a "charger" in the space used...
  10. (*steve*)

    QI chargers for multimeters

    My wife just bought a new phone which has a "wireless charger". Whilst doing some investigation, I noted that the receiver coils are cheaply priced and the thought occurred to me that it would be possible to replace the battery in a multimeter with a small lithium cell and a charger based on...
  11. (*steve*)

    What's this crystal?

    I purchased some crystals that were supposed to be 32.768kHz in a form usable for breadboarding. They didn't work (and no, these aren't from China :)) When I replaced them with a surface mount crystal on legs, the circuit leaped into operation. I'm wondering... Is it possible that these are...
  12. (*steve*)

    Buying stuff from China.

    So I wanted some 4060's, not for anything that I really cared about, and I wasn't in a hurry, and the price for 10 of them from China was less than the cost of one locally (and they would deliver to my door). This is how they were packaged inside the padded envelope: Not only in...
  13. (*steve*)

    My $4 precision weights

    I have a digital scale that I purchased when I had a large number of very small objects to count. It can measure to 200g with 0.1g resolution. But I've always wondered how accurate it really is. So, I spent about $4 on a set of "precision weights") from China. Here are the nominal values...
  14. (*steve*)

    An RS lunch

    For those of you in OZ/NZ, RS are having a BBQ on thursday for people who pick up their orders at the trade counter. A colleague and I are placing our orders (and getting a bonus 20% off) just so we can check out the BBQ :D If you're one of their customers you'll probably have an email from...
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