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How to trigger a combined signal
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tooki:

--- Quote from: RAPo on October 13, 2022, 07:48:24 am ---The quad tracer I mentioned has the following schematic.

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Can you link to the original magazine in question instead of a poorly-cropped low-resolution screenshot in which nothing can possibly be read? I can make out that it’s Popular Electronics, so it’s almost certainly available for us on worldradioarchive.
RAPo:

--- Quote from: tooki on October 16, 2022, 02:26:15 pm ---Can you link to the original magazine in question instead of a poorly-cropped low-resolution screenshot in which nothing can possibly be read? I can make out that it’s Popular Electronics, so it’s almost certainly available for us on worldradioarchive.

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Here it is: https://worldradiohistory.com/Archive-Poptronics/90s/92/PE-1991-07.pdf
StillTrying:
"I'm trying to trigger on 1 channel (the yellow one),"

It should be possible to get some sort of temporary stable trigger on that yellow because Signal 3 always shoots up to Signal 1 giving a long +ve edge.
Perhaps move the trigger level away from the middle Signal 2 level, trigger on AC coupled, or add "Noise Rejection" to the trigger, can't think of much else. :)

RAPo:

--- Quote from: StillTrying on October 16, 2022, 02:45:13 pm ---"I'm trying to trigger on 1 channel (the yellow one),"

It should be possible to get some sort of temporary stable trigger on that yellow because Signal 3 always shoots up to Signal 1 giving a long +ve edge.
Perhaps move the trigger level away from the middle Signal 2 level, trigger on AC coupled, or add "Noise Rejection" to the trigger, can't think of much else. :)



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I arranged the things such that there is no overshoot from the signals in the 3 regions. What you see are the chop lines.
tooki:

--- Quote from: RAPo on October 13, 2022, 07:39:50 am ---
--- Quote from: jonpaul on October 13, 2022, 04:59:28 am ---schematic or block diagram no idea what you are doing

j

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I haven't found any details on this apparatus. In the attached image you'll see the front end, the inner parts and another experiment.

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It’s on page 63 of the catalog here: https://www.yumpu.com/en/document/view/5663030/electrical-machines-elwe-lehrsysteme . (Use the login from http://bugmenot.com/view/yumpu.com if you want to download the PDF.) 

The manufacturer went out of business and was bought up years ago by a company called LD Didactic, which is still around. They may be able to supply the manual. (They have a downloadable archive of manuals, but requires registration to download.)
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