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  1. (*steve*)

    Nice relaxing day.

    I love days like this when nothing is going on and I can just relax and not have to worry about anything.
  2. (*steve*)

    triax bnc and reverse polarity bnc adapters

    I have some test gear with unusual connectors. The first of these is a 2 lug triax bnc connector. My cables are the more modern 3 lug variety. Has anyone seen an adapter? Another piece of equipment has reverse polarity bnc connectors. I have seen a converter, but freight to Australia is...
  3. (*steve*)

    Was I dreaming (fast PCB etching)

    I'm not sure I was dreaming or if I read it... Did someone post or provide a link to a method they used to etch PCBs quickly? It involved electroplating the copper off the board then finishing the process in conventional chemistry. Or did I just dream it?
  4. (*steve*)

    Wayne Kerr 7010 manual

    Has anyone used one of these? I acquired two of these devices for almost nothing. Both appear to work and I am able to measure various resistances, capacitance and inductances. However I'm sure the equipment can do far more than what I do with basically one button! I have searched the web...
  5. (*steve*)

    Burleigh PZ-70

    Does anyone have any information on these? I have a sick one.
  6. (*steve*)

    Can you identify this lifeform?

    Well, can you?
  7. (*steve*)

    playing around with a current sink.

    I'm building a circuit with an active load which happens to be a constant current sink. One desired factor is a high impedance, and since it's for an audio application I really want it to be flat over audio frequencies. The results first (please excuse the mobile phone images. At 130Hz...
  8. (*steve*)

    Getting into hot water

    Arriving at the office today I saw the following: And I noticed a circuit board had been pulled out. Hmmm, something is going on... Some subtle clues on the top side: And some evidence of poor design and Hodges to fix it: It looks to me that there is/was a high resistance...
  9. (*steve*)

    Playing with valves

    I've been playing with some funny evacuated glass tubes. And I've been starving their anodes! These graphs are a bugger to do manually.
  10. (*steve*)

    Airflow detector

    Our hackerspace is adding some smarts to the laser cutters to prevent stupid and expensive mistakes. Another guy is doing the logic (in hardware -- for resilience). My job is the airflow sensor. After discussing a few options (including hot wire sensors and the like, I have sorta settled on a...
  11. (*steve*)

    Super Bowl

    Watching it live! So Exciting! I don't understand a thing...
  12. (*steve*)

    What battery?

    I have an old battery operated device (for the curious its a Lafayette 7601S G.S.R.) and I am trying to identify the batteries it requires. It contains what is most likely an op-amp withe the two batteries centre tapped to form a double ended power supply. The batteries are cylindrical and a...
  13. (*steve*)

    I had a thought... (Vreg close to Vin)

    We often get asked about regulating a 6V battery to 5V, or a lithium cell to 3.3V or similar where the input voltage is either very close or may even swing either side of the desired output voltage. Conventional answers may include LDO regulators or even just series diodes, but where the input...
  14. (*steve*)

    what am I

    It's pretty cool actually.
  15. (*steve*)

    Evaluating operating temperature range

    I have an Agilent multimeter which has an inbuilt display of the temperature of the device. It is currently sitting in a plastic bag outside. I am waiting for it to read -10C which is the lower limit of the operating temperature range. When I get home, I'll try the same thing with the upper...
  16. (*steve*)

    74hc6323 alternative

    I'm looking for an alternative for the 74hc6323. The key requirements are that it has an integral oscillator (I.e. just connects to the crystal directly), works to at least 20MHz, divides by 4, and is available. preferably so-8 or similar, 5V operation, fundamental (not 3rd overtone), cheap...
  17. (*steve*)

    It's in the box

    Here's a few things I've been working on. Nothing fancy in the electronic sense, but placed in custom boxes. First is my A-B 4 wire resistance tester. This is simply so I can compare the readings between two 4-wire resistance meters quickly. If one can be verified as being close to "in...
  18. (*steve*)

    Anyone near Indiana?

    I'm going to be in Fort Wayne IN between about 14 Jan and 12 Feb. Anyone nearby?
  19. (*steve*)

    Fixing broken and unbroken equipment

    My local hackerspace has equipment that gets treated... roughly. The first thing I saw was a bench power supply moved away from the electronics bench looking rather forlorn. I knew it had been used to charge some batteries and that someone had turned the voltage up leading to both a very hot...
  20. (*steve*)

    Ive just bought US$155,000.00 of test equipment :-O

    Well, if you take a look at 1990 prices it adds up to that. I didn't pay anything like that. Some will likely be donated to a local hackerspace. Some of the stuff is huge! Have you ever seen a HP54111D? The specs are still pretty impressive. And does anyone know why an HP3456A cost more than...
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