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Forum Index : Microcontroller and PC projects : Huntron tracker on LCD backpack

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Senior Member

Joined: 05/03/2018
Location: Netherlands
Posts: 245
Posted: 09:03am 26 Nov 2019
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About the backpack tracker....

Finally decided to finish it. I had plans to improve the tracker using a ArmiteF4, then investigated the PicroMite. In the end, decided to leave it as is. It is good enough for me.

Used some thin wood to build a case, painted it army green (don't know why, not really happy with the color now) an use it now. I will give it a second layer of paint (this one is not covering well) and add a  sticker with text "Backpack Tracker" next week.

But it works, and is used...

If nothing goes right ... turn left

Joined: 03/03/2016
Location: United States
Posts: 558
Posted: 04:22am 28 Nov 2019
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Nice job Harm!!! You'll get a lot of use out of it.

Back in the 1950s I found an RCA published note showing how to use an XY scope, a 6.3 volt filament transformer and three resistors as a current limited curve tracer. I got it working using a Dumont 294 scope and it proved very useful.

At Link Alan (W2AEW) posted a video showing a Heath 4552 scope which contains the curve tracing components built it and then shows the use of the transformer excited circuit on a Tektronic dual trace scope.

Decades later at Pan Am I bought about 20 of the original Huntron Trackers which proved very useful in the electronic shops.

I can't seem to find the original RCA publication on line. I did find an excerpt of an August 1975 Popular Electronics article by Randy Fromm showing a current limited circuit which works well at PDF Link. Here's another one that uses a very unusual enclosure.Tuna Fish Can Curve Tracer

They will work with any 500 KHz XY scope. Search Google for OCTOPUS COMPONENT TESTER. Don't build one without limiting the maximum current with extra resistors!

Does anyone have any suggestions for the most unusual enclosure? Have fun guys!

Paul in NY
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