Interested in doing an BJT (Bipolar Junction Transistor) -- tester. Like the continuity tester project just completed, it would be an contribution in the form of an article to this site. I have never done an BJT tester before, and I am interested in hearing, or rather "reading" -- your thoughts on how you would go about engineering such an project.
:: Requirements ::
Battery powered with power switch
Identifies NPN or PNP types
Indicates short or open circuit
Uses LEDs to denote conditions and identifications of types
Budget of $3 max in parts (based on Tayda Electronics pricing)
I suggest you look up the Bangood one (Cheap Component Tester thread) - while more complicated than your idea it's vastly more useful.
Going back a number of decades there were simple 555 based transistor testers which probably did what you're talking about - here are a couple of examples:
Damm straight that looks tops and is soooo cheap at only 7 pounds (about AUD 14)
Basically I am looking to produce PCBs for a dozen or so 'simple' projects with the intent of selling them in KIT form for a few dollars only later on down the track in an hobby electronics shop...
Little ghost made something like that a while back, he used to frequent this forum.
It was a curve tracer, if thats what you meant.
There is someone selling kits for something similar, but they are expensive, cant remember what its called.