josephkk said:
It has volts of overhead but it will do just that. Just setup the inputs
for full scale (20 mA).
?-)
I put together the 2 btj version here at home base using 2222's, 10k
and 31 ohm I r.
I did this early this evening, I applied enough to generate 100mA and
it started at 20.6mA using a 15 volt supply. It has been 1.5 hours and I
just looked at the amp meter, it's reading 20.7ma and flickering back
down to 20.6 mA. that maybe no more than 100uA at most..
When I first tested this, I put my hot air wand on it for a short time
to get the btj's hot to the point of near destruction, I saw no more
than 2mA increase. The - feed back (not voltage but effect) seems to
work nicely as expected.
I just can't see how a few here are seeing outrageous readings as they
are? Makes me wonder at times.
I think maybe some ot to go back to the actual proto testing and stop
believing what the sim states. The sim is not always correct.
Its like saying it has to be true if it's on the internet..
I only did this for my own curiosity because we have used that type
of current limiter for many things over the years and still have them
operating in circuits made years ago. I don't remember ever doing a
temperature test, ambient or junction, on this limiter.
I am satisfied with it, the rest can do as they please
Btw, this was the one that Phil H originally posted if I remember..
old relic. The circuit, not him
Jamie