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Unless it's an expensive IC, troubleshooting a circuit like that is difficult since it is only read once while the SA is booting up. That's why most people would just change a gumdrop IC to attempt

To be fair, some of the members are just getting into electronics. I've been at it for over 50 years. At one point I spent eight hours a day testing new circuit boards and repairing the bad ones. My

Hi Vincent, this is funny, after my previous post I went looking for a Faster, Lower On-resistance, Higher Voltage FET, and found this one: IPA60R280E6 , so this is in the same area as the one you

On Tue, 24 Jul 2018, Michael A. Terrell wrote: It is simply astonishing how helpless some people are :) If one wants to replace a DIP IC he doesn't need _ANY_ specialized desoldering equipment. Just

Well …, I don't yet know that it needs to be replaced. The buffer IC may not be the problem and I don't want to begin changing parts until I have a more conclusive idea as to which part to change.

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