Very good instructional videos. And the book by Jim Williams is awesome, too. i like your pace and delivery. Very clear and organized. Best description of a zener diode I have seen!!!! Thanks. Keep the great work.
Excellent video. I very much like your the detailed explanations of the underlaying electronic principles. Thank for investing your time. Looking forward for more videos..
Fun puzzle! I paused the video and worked on the puzzle. Took me a few hours with multiple false starts, but I got the exact same answer he gave in the end! Also, instead of a 10V zener, you can use a stack of about 14 silicon diodes to perform the same trick by creating a combined 10V forward voltage drop!
For voltages more than a few diode drops, it's far easier to use an "amplified diode", which is a high-β transistor with a resistor R1 from collector to base and a resistor R2 from base to emitter. The collector-emitter will start to conduct when the voltage across it reaches approximately (1 + R1/R2) * 0.65 volts. For example, to simulate a 10V zener that has to pass up to 15mA, you might use a BC547C with R1=39K and R2=2.7K.
What do you even call this circuit? I was looking for this exact circuit. I have a +-24volt supply available. But my opamp only handles +-18v. And I wanted to invert a - 24volt signal to a +24volt signal. Not sure it can be done... Got any advice?
Was your 1st circuit wrong???because for an op amp output should be within the supply voltage of op amp(saturation voltage)...otherwise op amp will work as comparator...
Thanks for a good Video. I did try the above circuit by LT Spice the output did sewing from 6.4V to 13.6V rather than 0 to 20V. I did change the 0.1uF by 1uF then the output did sewing from 0 to 20V. Why please?
I don't know what frequency your input signal was configured to be in LTSpice, but if changing the coupling capacitor affected the voltage swing, I would suspect it has something to do with the impedance of the capacitor at your selected operating frequency.
You need a very negative supply such that current will always be flowing in the direction that will reverse bias the zenner. A -25 V supply is less than the minimum output (-20V) and will make sure that current will always flow in the direction that will reverse bias the zenner even when the output swings to its lowest point.
We can, but they very rarely do anything interesting or useful. I know this, because (by omitting components or accidentally using incorrect valued components) I have created many random circuits over the years! On the other hand, it is possible to evolve a useful circuit by using artificial evolution, combining and testing random assortments until you get the result you want. This method also used in antenna designs.
I love the comment around 8:10 ish... "Zener diodes aren't known for being very accurate" I'm guessing nobody told that to Linear Technology when they invented the LTZ1000A with it's temperature controlled buried zener? (Before y'all scream at me... Yes, I _DO_ know that's a VERY special case scenario)
Zener diodes in fact are quite accurate, but as they are current-mode devices, you need to provide them a stable set current to get that stability, rather than any particular voltage.
Good god ole'mighty throw that piece of shit Klein meter in the trash. And throw that crappy yellow no-name meter away. Man it makes my eyes hurt to look at shitty test equipment.