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That doesn't make sense? Show the display with the calibrator as input. Set trigger to Auto.

Yup, a balun (CM choke) could be in the rather long section of the mechanical mounting structure between the small core and the cable connection. It would help with CMRR.

Joe, the board seems very simple to build. If the processor was programmed is there any reason we can't assemble it? Pretty sure we have the skills and tools to succeed! And it seems it would take a

Followed the SM instructions for 'No Display' but haven't made any real progress, other than getting a dot to appear on the screen (as opposed to merely glowing off-screen) by adjusting the R587

So the flicker only shows up at slower sweep speeds it goes away as I slow the time base down.

Hi all, In addition to the obvious current transformer, there’s likely to be a balun, to make the probe less sensitive to electric (capacitive) coupling. Thats’ probably in the longer tail, away

Check the CPU's reset line. It's driven by an optocoupler on the power supply board, as I recall, and the resistor that drives the LED side of the optocoupler can open up. -- john KE5FX

Hello everyone, First of all, I apologize for being absent from the forum for so long. Some time ago, I ordered the capacitors and have already replaced them. However, I made a mistake: instead of

If you go to our website and search for demo board, you find the description. eBay listings disappear when sold out. https://vintagetek.org/vintagetek-demo-board/ Dave

Here is the link to the board description. It contains a link to a zip file that has some instructions, a Digikey BOM, schematic, and hex file. I assume the hex file is to load the ATMEGA328P.

Given the fact that these 25 boards were sold out rapidly I'd assume there is demand for the next 250 boards rather than the next 25! I hope I will be quick enough next time! Thanks to you volunteers

?ann sun., 2. mar. 2025 kl. 15:49 skrifa?i Larry McDavid via groups.io <lmcdavid@...>: Follow the white rabbit (from the first post): https://www.ebay.com/itm/116498624308 >

Please point to where this demo board is described. What does it do? I could not find it on the Tek museum website.When you say? "Watch the store," what store? Do you mean the Tek Museum eBay store?

We have inventory for another set of 25 and will begin building. Watch the store. We didn't expect this amount of demand and have a lot of shipping to tend to this week.

That should work. You can experiment with different cores easily and see how they measure up. Ed

I plan to build 25 more demo boards for the museum in the next couple of weeks, and will post here when they are available again. -Thomas

Since the last run of 25 sold out, I suspect they will plan to make some more of them. Being an all volunteer organization, it might not happen as quickly as some might like. I bought mine some years

The sine wave is a sawtooth on the screen. The modulation is in the Z axis. These two make it sound like ripple in the power supply. I have worked on these and found most of the 1mfd axial tantalums

Hello I recently picked up a 453. When triggered on a sine wave it seems to flicker. Interestingly it will stop flickering when i reduce the time to a certain point. Wondering if someone can point me

I just went to the ebay link, and it still shows "out of stock" and no way to order it... I would like to get one of these boards, or at least the programmed Atmel chip or a source code listing for it