Hello! Good video!The output impedance of the transistor probe must have low output impedance (as said the author) to avoid cutting-off frequency response. The second important thing - you must have a load (50 Ohms) on the another side of coax cable (next to oscilloscope) - to avoid "ringing" of this cable - because reflected signals. It is fairly important for high frequencies (above 1MHz) - and it can distorted for example shape of rise or fall of an impulse.
Understood that it's exaggerated for the purpose of the video, but obviously when your output impedance is several megaohms, of course probe input capacitance is going to play a huge role in the waveform.
Some are powered from special connectors on the scope. High end scopes will have additional contacts next to the input BNC, and brand specific probes for dedicated functions, e.g. differential probes, current probes, FET probes.
Wondering if you could make a transistor curve tracer board. I made one in my younger years and it was extremely handy for finding bad transistors, diodes and to some extent bad electrolytic capacitors. Seems like it had a small ac 12vac transformer and a range switch for two test voltage levels. If anyone could make a small board like that you could.
I think you are wrong in your analysis. What loads the circuit is the tip capacitance of the probe usually 10~15 pf for standard probe, which shunts the 9 MEG input impedance of the probe.
I know the basic of resistors, transistors, capacitors etc. but i dont know how to procedd further. i want to build circuits on my own how do i do that. I am completely fed up , please show me a way. I dont just want to google any schematic and just make it. i want to build my circuits , many ideas pop up in my mind . but i dont know how to build them, how to start. i have built basic circuits like simple blinking led circuits , like very basic circuits they are. now i want to be professional , i want to be a complete electronic guy, who just can build anything. please help. and kindly provide your social media account where i can stay in touch with you. You are doing an awesome work sir. Love you!
stop watching TH-cam and start reading. I have a video on what books are good: th-cam.com/video/OBNl-6nFyL0/w-d-xo.html study study study. fix broken electronics, a lot of it. the more circuits you have to learn the more you can use in your own design. go to school. get a job.
@@SaintlyWisdom I am now a retired EE. I started my journey in electronics at age 15 by reading basic electronics books and playing around with basic circuits. Eventually I got a job as a repair technician, then on to a tech manufacturing mini computers. I managed techs on a digital scope manufacturing line. Then decided to get an engineering degree. Several more jobs in designing scopes, EEG instrumentation, telecommunications, ant then a University job designing instruments for various science projects. I traveled to Europe, Mexico, Sweden, Germany, and twice to the South Pole. -- So the advice above is good advice, it is how I built a career. Good luck it is not a quick path to riches but it is satisfying. Work hard, study an aspect until you master it and then move to another topic. Cheers Dan P.S. I am still learning new things, and re learning old things. ;-}
I agree with Ashley, the active probe is not more useable for digital applications. A passive probe is just fine. The FET probes are more useful in analog applications.
Hello! Good video!The output impedance of the transistor probe must have low output impedance (as said the author) to avoid cutting-off frequency response. The second important thing - you must have a load (50 Ohms) on the another side of coax cable (next to oscilloscope) - to avoid "ringing" of this cable - because reflected signals. It is fairly important for high frequencies (above 1MHz) - and it can distorted for example shape of rise or fall of an impulse.
I enjoy your humor and your teaching style. Thanks for the videos.
Thank you for all your videos, they have helped me learn a lot over the years!
Great to hear!
I'm gonna ambush my professor with this. He got it coming.
Understood that it's exaggerated for the purpose of the video, but obviously when your output impedance is several megaohms, of course probe input capacitance is going to play a huge role in the waveform.
You counted “20, 40, 80” when measuring the rise time like some sort of human shift register
what are the scope probes MFG and part numbers. Great videos keep em coming.
Essentially correct.
Thanks... essentially
@@IMSAIGuy smile
Very informative video Sir
Why have u added a resistor to ground in the FET circuit of the active probe
it is called self bias: th-cam.com/video/m165psz9SOM/w-d-xo.html
Where does the active probe get its power from?
Some are powered from special connectors on the scope. High end scopes will have additional contacts next to the input BNC, and brand specific probes for dedicated functions, e.g. differential probes, current probes, FET probes.
ok thanks
Wondering if you could make a transistor curve tracer board. I made one in my younger years and it was extremely handy for finding bad transistors, diodes and to some extent bad electrolytic capacitors. Seems like it had a small ac 12vac transformer and a range switch for two test voltage levels. If anyone could make a small board like that you could.
I did a 10 part video series on that: th-cam.com/video/oFHTOQTIi30/w-d-xo.html
Thanks for the reply.
"If you make a measurement, you screw up the measurement"
I think you are wrong in your analysis. What loads the circuit is the tip capacitance of the probe usually 10~15 pf for standard probe, which shunts the 9 MEG input impedance of the probe.
I know the basic of resistors, transistors, capacitors etc. but i dont know how to procedd further. i want to build circuits on my own how do i do that. I am completely fed up , please show me a way. I dont just want to google any schematic and just make it. i want to build my circuits , many ideas pop up in my mind . but i dont know how to build them, how to start. i have built basic circuits like simple blinking led circuits , like very basic circuits they are. now i want to be professional , i want to be a complete electronic guy, who just can build anything. please help. and kindly provide your social media account where i can stay in touch with you. You are doing an awesome work sir. Love you!
stop watching TH-cam and start reading. I have a video on what books are good: th-cam.com/video/OBNl-6nFyL0/w-d-xo.html
study study study. fix broken electronics, a lot of it. the more circuits you have to learn the more you can use in your own design. go to school. get a job.
@@IMSAIGuy thankyou so much
@@SaintlyWisdom I am now a retired EE. I started my journey in electronics at age 15 by reading basic electronics books and playing around with basic circuits. Eventually I got a job as a repair technician, then on to a tech manufacturing mini computers. I managed techs on a digital scope manufacturing line. Then decided to get an engineering degree. Several more jobs in designing scopes, EEG instrumentation, telecommunications, ant then a University job designing instruments for various science projects. I traveled to Europe, Mexico, Sweden, Germany, and twice to the South Pole.
--
So the advice above is good advice, it is how I built a career.
Good luck it is not a quick path to riches but it is satisfying.
Work hard, study an aspect until you master it and then move to another topic.
Cheers Dan
P.S. I am still learning new things, and re learning old things. ;-}
@hardstyle905 wow that is really an insulting question, it does not deserve an answer.
@hardstyle905 you are a very sensitive guy,... I'll bet everyone loves you.
So an active would be more useable for digital then say radio or audio circuits? Interesting. Thanks for the look.
Digital circuits are not normally high impedance.
@@OC35 understood, but was wondering about the probe application because of its response as well as its limited voltage input.Thanks.
I agree with Ashley, the active probe is not more useable for digital applications. A passive probe is just fine. The FET probes are more useful in analog applications.
@@IMSAIGuy that's what I wanted to hear, thankyou!