Building a little test circuit for the reflow-soldered 74HCT138 integrated circuits. 7 out of 7 worked. Awesome result 🙂
By Julian
Youtuber, shed dweller, solar charge controller aficionado
Good morning all…
Youtuber, shed dweller, solar charge controller aficionado
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You let the magic smoke out of that one, but apparently not all of it… BTW, the hype about how sensitive CMOS logic is that I've been hearing for years has never been a problem for me, lack of wrist strap and all. The only time I've ever blown any CMOS up was while plugging and unplugging it while the power was on. 🙂
What are those connectors called on the battery pack that connect the wires to the breadboard.
Love it need parts list.thanks
That was a surprise. Will you please try using a similar technique, but putting the solder onto the component leads? It should allow you finer control of solder paste quantity and positioning, thus less chance of bridges and dry joints. Proper applicator nozzles should help. Thanks.
Hi Julian, as usual your demo and explanation is easy to follow and understand. Will you be doing any arm core processor (STM) code demos in the future? Thanks for sharing
What resistors were on the legs of the LED's?
Julian, if you're going to be testing many 74-series or 4000-series ICs, you might want to get yourself a MiniPro TL866A or the slightly cheaper version without the ICSP port (I think the suffix is C or CE instead of A, but I don't remember for sure).
It programs almost everything "programmable" and tests most of the common logic chips.
But this is still a good video for teaching newcomers how to test these circuits with a few relatively cheap components.
I wish I could like this twice. Nice job overall testing out a theory, applying it, and then validating the results. Just beautiful.
Julian have you considered using a paint stripping hot air gun for smd soldering?
why does he have his fleshlight on the table in every video?
Hi Julian, Have you tested to see if the paste is thin enough to pass through a hypodermic needle? The only rework station I seen for surface mount had stereo magnifiers (almost a microscope) and a small hot air blower and a paste dispenser that ended in a needle tip.
Good catch on the printing error for the active low inputs, I'll have to look out for that. Although it appears only Motorola fails to use that bar convention for its chips
Normal people would just buy the DIP version of the 74HCT138? While this is interesting in discovering the hardest method possible in order to achieve an end result, I'm still wondering why.
It's like using solar power via three different power modules simply to power something.
I'm hoping a Patron will donate an adjustable power supply and a hot air gun, so Julian can be as comprehensively equipped as the rest of us 12 year olds.
Instead of using resistors to avoid the risk of shorts, why not just test for shorts with a continuity checker before connecting up the circuit? It should only take about a minute for a 16 pin chip.