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I wonder, during manufacture, is it possible to strip a flat cable's isolation by melting / burning it away with a hot bar? <cheater00social@...> wrote:

Thanks John, have you ever soldered large conductor count ribbons like that? What about ones at 0.64mm pitch? How did that go, did it need a lot of rework, etc? <john@...>

Just hold it down, flux it up, and it will solder well.

The connector is already decided, it is the PCIE x1 connector. All I need to figure out is how to solder a ribbon to a pcb with minimal effort and cost and rejects, and how to house the whole thing

Thanks Leo, what are transit connectors? I was thinking of soldering the ribbon cable on a diagonal. So if the pcb is 25mm wide, and x mm long, then the diagonal is sqrt(25^2 + x^2) mm long. Since

The data sheet at https://www.analog.com/media/en/technical-documentation/data-sheets/ds1230ab-ds1230y.pdf mentions “lithium energy source” which is presumably the usual battery.

Yes - I noticed they were selected as well but, like you say, we don't know the criteria. New 2N3053s have a range of 50 to 250 for hFE so I suppose it's a crap-shoot as to what one

I forgot I had a news blog about the reorganized movies. I haven't been keeping it up. The list I keep up is on the main movies page at https://vintagetek.org/tektronix-in-movies-shows/ I try to put

I am late joining this thread, and although I have look at the previous posts in this thread my remarks may already have come up. Note that Q32143 and Q3220 are shown on 7704A change sheet M32489,

I would be looking at IDC connectors, like what was used on old PATA hard disk drives, or FFC/FPC cables and connectors. The former is bulkier but can carry more current and endure more flexing. The

Have a look at the DS1230Y/AB nonvolatile RAm it uses EEPROM or FLASH memory and NO BATTERIES REQUIRED!

I'm inclined to do that but it still bothers me that one board needs it and the other does not. Maybe I'm just nit-picking now. Thanks, Barry - N4BUQ

I have three transistors with which I can use to test for Q32143: 1) Original in the misbehaving regulator - hFE: 122 2) New replacement 2N3053 (from Mouser) - hFE: 172 3) 2N3053 from working

Barry, if I read the diagram correctly the gain of the loop is boosted by C134 above some tenth of Hz, then dampened by both RC119 and RC141 around hundredth of kHz. Yes I believe it could be fun to

The values of R32117 and C32119 are setting the open loop bandwidth and phase margin but the tolerance is not critical. What current through R32139 do you get when pressing BEAM FINDER? Also check

The values of R32117 and C32119 are setting the open loop bandwidth and phase margin but the tolerance is not critical. What current through R32139 do you get when pressing BEAM FINDER? Also check the

Jim, After reading again the Trouble shooting section and once more studying the schematics I very much doubt that my reasoning about integrator drift was correct. More specifically there is a Test 9

The values of R32117 and C32119 are setting the open loop bandwidth and phase margin but the tolerance is not critical. What current through R32139 do you get when pressing BEAM FINDER? Also check the

The values of R32117 and C32119 are setting the open loop bandwidth and phase margin but the tolerance is not critical. What current through R32139 do you get when pressing BEAM FINDER? Also check the

Some factors to consider: 1. Transistors of that era (!) may have used a different process.? As time went on, the methods of making transistors improved (generally, I think, for higher