IIRC it was the collector of the same transistor that went negative. Of course you could hang a follower on it. ;)
Cheers
Phil Hobbs
Of course! a Darlington zener! pure genius. ;)
Cheers
Phil Hobbs
We can design complex systems using lots of optoisolators in lieu of transistors then.
NT
How about the old e-b junction zener as random noise generator trick?
Since this is a two-transistor challenge, use two, follow with a coincidence detector, and you've got the core of an infinite improbability drive.
(That should tie in nicely over on the Flat Earthers farce thread--build this & seed the universe with lifeforms galore.)
Cheers, James Arthur
Or stack two!
+12V -+- | +-------. | | .-. .-. R1 | | R2 | | '-' '-' | | |>' '-' SF1 .--| Q1 | | |\ |>' === '-----| Q2 |\ '----> V-Cheers, James Arthur
This is actually a good practice, to reduce correlation. Use a complementary pair.
I have an old noise generator that uses a pair of 6D4 triode thyratrons for magnet biased noise generation. One is inverted, then both signals are summed and amplified to the output.
Tim
GR?
yes, you are right. It could actually be used to de-IDss a JFET when no negative supply is available.
We had a nice discussion about this a couple years ago in a thread called "A very silly circuit." I bumped the thread.
Cheers, James Arthur
Not knowing the criteria I guess a simple flip flop might also qualify? Werner
Is the photon coupling idea known to be correct? There might be other mechanisms.
Sure, it's just a low-beta isolated-base transistor. And slow.
It's on the list already.
Cheers
Phil Hobbs
I don't know of anybody who's actually measured it. It might well be hot electrons rather than photons.
Cheers
Phil Hobbs
Nah, Elgenco. Seems to be more obscure? Probably not an unusual circuit for the day.
Tim
What is SF1?
George h.
I was waiting patiently for someone to notice. That was a gag--SF1 = smiley face #1. :-)
Cheers!
James Arthur
It says "bistable" but is that just set-reset or can you do a JK?
SR only. You need more gates for clocking and so on.
Cheers
Phil Hobbs
One can make a toggle (divide by 2) flipflop by capacitively coupling into both grids/bases. Done delicately, it has worked.
It's easier to do a divide-by-N by injection locking an astable, with just resistors or caps.
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