开云体育

I picked up a working 1502 a few years ago on that auction site. The batteries were shot, but I found a paper on using a resistor and a big cap to fool it into thinking it had batteries. I think I

You might, for the sake of general learning, get some breadboard kits, general purpose transistors, and start breadboarding some transistor amplifiers and switches. It would give you a feel for the

Does anyone have a clearer copy of the access board layout? Maybe an actual photo of that page? The only ones that I have downloaded so far are all but impossible to read. Thanks! Russ

Excellent - congrats on the fix.

Which "above written description" are you talking about?? Unless you quote from the email you are replying to, we have no idea what you are talking about.? Notice how I quoted your email reply??

I really like 1502 (not a, b, 1503 etc), and have some I ought to sell. There are two principal weaknesses other than the usual PSU caps: * the tunnel diode is relatively fragile, and can be destroyed

Sorry to hear about your health problems Russ. First things first of course. There you got me! I remember I was typing with the laptop on my knees. I had to look skew at the manual and though I even

just checked to see that pictures aligned with the text...NOT!? it is a mess, not sure how to fix that, nor am I sure how/what happened. ended up with some of my pwr sply too! hmmmm all out of order.

If lightning hit that drop, there is likely more than one damaged area, or even long stretches of the shield is gone. I worked in CATV repairing the electronics and I have seen damaged coax where the

It's alive! The parts arrived today. I replaced the acquisition RAM with a MB8464 - not the original part, but it appears that the original part was unobtainium. The 'scope now displays traces

Yeah if you need the short distance performance the 1502 is the only way to go. The newer models which have LCD redoubt if the LCD has not gone bad now it will. And the unfortunate part is the LCD was

TV coax problem.... As noted, u don’t indicate the run length u have. If it goes from ur house terminal to the typical green post in the yard and it is 100ft or less, it would be more efficient to

I'm so sorry that I havent kept up with all of the help here, Albert. I wasn't expecting such a willingly helpful group when i joined the group. This has been an exceptionally busy June for me. I'm

hi all, The above written description is quite good, and clear. Due to diversity in human nature, sometimes a picture or video supplementing information for a procedure can be helpful to some,

You might want to try doing a web search on terms like those below to find some other ideas too. A TDR is not the only way to find a cable break. You can find where a signal fed into a cable is

Hi Jeff- I have the little bugger up and running using 2n5881 xstrs, runs 2.5A draw at 11.5V and ~900ma at 26V scope runs all the way down to 10.5V!!!! all of this is little at a time when I have

Hard to tell by that waveform. To get it as pictured you need to set everything just like they did when they drew it, or theoretically set it. With that auto intensity control you should be able to

Oops - in my final admonition, I should have included "AC power" as well - that's used too sometimes. Ed

Alan Wolke did a video on TDR using a scrap box ~1ns pulser: < https://www.youtube.com/watch?v=9cP6w2odGUc>. For ~$2 and a few minutes soldering, you might be able to get useful results :).

Yes. The velocity of propagation depends on the dielectric constant of the center insulation and my memory says the impedance of the cable. There are extensive charts of cable and air line coax that