I came across this pic the other day. Is this for real ?
It's a drawing of a "cat organ".
Cruelty knew no bounds in the 17th century.
Many credit Athanasius Kircher with the original design of this instrument. He was a German Jesuit scholar.
"The musician selected cats whose natural voices were at different
pitches and arranged them in cages side by side, so that when a key on
the piano was depressed, a mechanism drove a spike in the
appropriate cat’s tail. The result was a melody of meows".
Synth lovers today respect all animals, especially cats.
This is a very good introductory video on JFETs - junction field effect transistors.
JFETs can be either N or P channel.
The channel conducts current moving from the source to the drain.
A voltage at the gate increases the channel resistance and reduces the drain source current.
Therefore, the FET can be used as an amplifier or a switch.
This is an excellent device.....Peak Atlas DCA Pro. The bits about JFETS are around 7mins & the PC applications are at 14:20.
We often
want to use a JFET as a variable resistor, particularly in phasers.
The problem with JFETs is that it is much harder to make
consistent JFETs than to make consistent bipolar devices. Therefore matching them is important.
These are screen shots taken of the readouts from my Atlas Pro of one of the JFETS.
Try to match the curves for each JFET along with as many other specs as possible.
I tested twelve J112s.
measuring VGSoff, Idss, VGSon in that order.
These were the results: