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Hi Leo, I fixed a couple of 22XX SMSP. The one in my 2232 last summer, and the other day the one in my 2215. The regulator is not too fussy as to what FET model you use to replace the old one.... AS

Where are you located? Someone on the group may live nearby. I would offer to replace it for you, but I can't get to my workbench until I finish disposing of the things my family stored in the

The switches are enabled to the data bus via tri-state buffer and an enable signal that occurs just once during boot up. Challenging to trouble shoot with my limited test equipment. And, if the buffer

I only have the user manual for that model, but the SA has to read the switches, usually through a latch that is polled at startup. That is where I would start troubleshooting. Michael A. Terrell

Hey Mike, Ive done three 500 Series restorations recently - 549, 547 and a 535,not a 555 though Tried to document as much as possible below,

FWIW non-linear optical methods are used to compress the length of laser light pulses. Somewhat analogous to NLTL's, but at 10^14Hz. https://www.rp-photonics.com/pulse_compression.html Craig

I have a nice high serial number (B030xxx) 495P spectrum analyzer with a defective A54 memory board P/N 671212401. I have determined that this board is defective by swapping in a known good board from

John Larkin of Highland Technology has posted a lot of comments about doing this on the news:sci.electronics.design Usenet newsgroup. His company does a lot of high speed system designs for other high

Jose said: "Not many people seem to have made DIY NLTL, let alone samplers based on it." This is probably true, because NLTLs usually have lots of stages, so can get very big and complicated before

Hi all, a cheap and broken 2215A found it's way to my home :-), so now I am in the process of getting it repaired. I used this document from H?kan that helped me a lot:

You can, within limits. The 488 bus is a difficulty, and may be more happily replaced with a chip or an FPGA, your choice, although there are 488 simulators. The front panel had a separate chip that

IMHO only replace electrolytic caps that have failed, those big Sprague caps are normally OK except when they go open-circuit. Dave

I did not know about NLTLs, thanks Bruce for the heads up. For those in my case, I have found a few references on the net:

Hi all, Looking for a volt/div knob for 485. It works fine and would like to use it more. Steve KG7HYG

René Rajesh, Thanks for the replies and pics. I thought that was correct but just wanted to make sure. Thanks, Barry - N4BUQ

Hi Guys, If there is too much for Craig, I would be interested to do a sharing-type deal. I live in London, UK. Both Craig and I wouldn't have any import problems, I think. This is only if Craig can't

Thanks for the suggestions. I'm pretty certain I had all the buttons pressed correctly but I'll recheck that (wouldn't be the first time...!) and I'll try to check the unblanking circuitry. What about

Hi Folks I am working on a tek 455 scope. managed get the trace up. facing a trig problem. doesnt trig in auto/normal/single sweep. trig view signal ok. suspect trig ic 155-0122-00 is this ic used in

Hi Andre I'm near Oxford UK and would be very pleased to have these. Regards Craig

Tiny island near France, called Guernsey. www.cwgsy.net/private/mandoline "Error 008472. Horrible bug encountered. $Deity knows what happened." Where on planet earth are you? Craig