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  1. (*steve*)

    New project - 1967 oscilloscope restoration

    I picked up this from a for sale group (these were the photos on the site) I was immediately attracted to the cut off twin flex! :) The guy who sold it to me told me it has been sitting in a shelf for years since his sister bought it from a school sale. So no real idea of the history of...
  2. (*steve*)

    EG&G 5210 Lock in Amplifier

    @cchu2k asked the following questions via PM, and I have finally done as promised and placed them in a thread. I've taken a month and a half to do this... sorry.
  3. (*steve*)

    filtering a 3000V power supply output.

    I currently have a power supply capable of 250W output, with the output voltage adjustable from 5V to 1000V (yep, that would be 250mA at 1000V). I'm soon to get a similar power supply capable of 600W and 3000V. These are deadly (I know that). They are electrophoresis power supplies, and I...
  4. (*steve*)

    My local hackerspace's electronics lab is taking form

    Still quite a mess, but three working stations and lots of components. Many of the parts draws and quite a bit of stuff you can't see here come from one of my colleague's estates. He was very keen to see stuff used and it is!
  5. (*steve*)

    weird BNC connector

    I have a probe I'm going to repurpose. It's a BWD P90 probe (apparently for a powerscope iia)0. The odd thing about it is that it has a connector that appears to be a push on BNC. However, it doesn't have any cutouts for the lugs. I found the lugs off a BNC socket I had laying about and it...
  6. (*steve*)

    NE5553U - Can't find a datasheet

    This chip is an old (probably obsolete) tracking regulator chip. The only location I can find a datasheet wants me to pay for it. I don't suppose anyone can help find a free version?
  7. (*steve*)

    My new power supply

    I'm a sucker for an old piece of hardware... A regulated power supply providing 3 rails: 0-400V 100mA (B) 0-100V 1mA (C) 6.3 VAC 4A It's nicely made, but pretty clearly not a commercial unit. The meters measure either the B or the C output. However there is no deflection of the current...
  8. (*steve*)

    For Sale: Silicon Chip magazines

    After filling in all the missing back issues in my collection of Silicon Chip magazines, I have a stack of issues to get rid of. Silicon Chip magazines 1989 Oct Nov 1990 Apr Sep 1991 Mar Nov Dec 1992 Feb May 1993 Jul 1994 Mar Sep 1995 Jan Mar May Jun Jul Dec 1996 Jul Nov Dec 1997 Jan Feb Mar*2...
  9. (*steve*)

    One of my colleagues...

    You may have noted I have occasionally referred to "one of my colleagues" in some of my posts. Unfortunately the person I most often referred to was suffering from some fairly nasty medical conditions which finally resulted in his death. I was charged by him (and later his family) to ensure...
  10. (*steve*)

    Datasheets moving about... Grrrr

    I was just looking for the old National Semiconductor AN-140. This was once found all over the place -- so much so that I had neglected to download and save a copy. Over time it had moved to the Fairchild site, and although that was subsumed into OnSemi the old links worked. No Longer... And...
  11. (*steve*)

    My next project? What do you think?

    I picked up a very sorry HP410C. I'm not sure if it's been wet, or in a corrosive atmosphere, or what. The handle seems to have quite a bit of surface rust. I wonder what it looks like inside?
  12. (*steve*)

    ridiculous harvest

    2 years or so after planting this, I get a single fruit before the plant dies. Is it really worth the effort? They do taste a lot better than store-bought ones though. Also, it's not green!
  13. (*steve*)

    Selecting a suitable component

    (*steve*) submitted a new resource: Selecting a suitable component - Finding a component that suits your needs at the right price Read more about this resource...
  14. (*steve*)

    what do I have here?

    This looks interesting. Anyone have any guesses what it is?
  15. (*steve*)

    Where to get shorting strap for terminal posts

    I have a piece of equipment missing some shorting straps for use when 4 wire measurements are not going to be used. Purchasing them from eBay (or any other obvious choice) is ridiculously expensive. Anyone know a reasonable alternative? I guess an appropriately shaped piece of wire would...
  16. (*steve*)

    Teaching people to solder

    Yesterday, I went along with my local hackerspace to a STEAM festival. We had one group that were selling laser-cut trinkets and demonstrating the use of a laser cutter, and the other group teaching people to solder. I was with the latter group. We had kids as young as 4 or 5 learning to...
  17. (*steve*)

    My brand new oscilloscope

    As you all know, I'm a sucker for "new" test equipment. How's this: It only has a few faults: The beam doesn't focus very well The focus changes over time Changing the X gain changes the X position slightly The cal signal doesn't seem to work The graticule illumination seems non-functional...
  18. (*steve*)

    How are all our colleagues in Florida?

    I've seen some fairly nasty photos...
  19. (*steve*)

    Playing with fire

    A week or so (it seems, it may have been a month) I checked one of my el cheapo electric screwdrivers and it was telling me the battery was VERY low. Having misplaced the charger, I've been promising myself to either find it or if something up. Today it wasn't reading a charge at all. Worse...
  20. (*steve*)

    What?! Being put on the sidelines is a good thing?

    Listening to an internet "radio station" and hearing their never ending advertising for their premium (ad-free) product... I think I am correctly quoting it, "Let Tune In put you on the sidelines of every game of NFL football." Where I am, being "put on the sidelines" means to be ejected from...
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