Heathkit Frequency Counter IM-4100 30MHz 1975 test teardown (Motorola S-1357A)
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- Опубликовано: 6 дек 2022
- wow works to 40MHz, its specification say : min 30MHz does really still hold :-)
it is accurate to the last digit, so i am super happy about this one, a big thanks to Claus for this one.
manual is now scanned and available at peel.dk look in the heathkit section, link here
peel.dk/Archive/Heathkit/
YES this one was also rebranded by Motorola and called S-1357A
See schematic it also say the motorola type number
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#oscilloscope
#teardown
#heathkit
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I use auto generated subs, so if you find errors worth fixing, please comment with the time in the video you saw the error, i will be happy to fix it. This also apply to the Danish version.
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Наука
Back in the day, I built dozens of HeathKit units. Their instruction manuals were perfection of clarity and instruction, both in the circuitry theory of operation and construction protocols. Nobody did it better.
absolutly right, their manuals are all on another level, i think heathkit was also used as a great way to learn electronics, so it is not only how to assemble and how to get a kit working, but also all the other things like a broad understanding
Kinda odd that Heath used the ECL triple transmission line amplifier IC in the front end of a 30MHz maximum frequency counter. Their older series of counters did essentially the same thing with a few transistors on counters working to at least 100MHz. I suppose it just came down to it being simpler, more modern, and maybe a few cents cheaper to use the overkill IC as solution.
Interestingly, you will find the same IC and associated circuit in practically every frequency counter design from the mid-70s. I don't know who first realized that the three identical differential amps in thus IC could be rigged up to provide not only a hign impedance buffer, but also a programmable gain stage AND also a Schmitt Trigger, and because it us ECL it will work nicely way up in high frequency ranges without modification; I found it odd that the Motorola datasheet for this IC gives no suggestion that it can be used in this way.
I had one of these, someone added a leading digit...it was cool...sold it later on. ~Jack, VEG
Cool video ! and thanks for the subtitle ! it help me a lot
thanks for letting me know, i "fight" a little bit with the creation of subs, so it is super nice to know people use them
@@TeardownOZ2CPU thanks again ;)
9:32 "SCHEMATIC OF MOTOROLA ...." So this Heathkit was also sold and badged as Motorola?
WOW i see that now :-) super comment, i go check the manual again
Interesting review. I was looking for the scanned manual, but don't see it at the linked location.
i am so sorry, my partner Peter who is responsible for the great site peel, is a little bit overloaded with scann manual work at the moment, the status with this manual is : it is scanned, but need to be made into a pdf, it is in the list of to do real soon, please check his site again soon,
OK, no problem. I will check again later. Thanks.
FINE ONLINE NOW :-) a big thanks to peter..