Function generator example filter sweep

Function generator example filter sweep
Real world example of a use for a function generator, sweeping a filter. When designing a low pass filter, you do the calculations for your cut off frequency and then lay out the components on a breadboard. The only way to know if it works as planned is to test it. you can test it using a function generator to sweep through a range of frequencies and see (on a scope) where the cutoff is.
5 boards for about $22 in about 7 days www.pcbway.com
Yes!! I now have merch: teespring.com/... Electronics themed T-Shirts!
HEY YOU ABOUT TO POST SOMETHING STUPID:
Yes, I know my hands are large/fat. It's because of a heart condition I suffer from called Congestive Heart Failure. Here's a link to some information about CHF: cle.clinic/2Td...
One of the symptoms is that is causes fluid retention, mostly in the hands, feet/ankles, and face.
It will kill me one day. I'm doing ok right now, but someday...
--------------------------------------------------------------------------------------------------------------------
If you are shopping for electronic components, test gear or consumables please consider visiting my Amazon shop @ amazon.com/shop/learnelectronics
Please check out www.patreon.com/learnelectronics and pledge a dollar if you can. It will go a long way to keeping the channel alive. It costs a bit of money to buy all the items and produce these videos. You help is appreciated.
---------------------------------------------------------------------------------------------------------------------
Or....if you'd like to send a one-time donation you can use this link: paypal.me/learnelectronics
----------------------------------------------------------------------------------------------------------------------
Here is all the gear I currently use:
Oscilloscope 1: Rigol 1054Z amzn.to/2PRybtN
Oscilloscope 2: Siglent SDS1202X-E amzn.to/31Kk1yH
Power Supply 1: TekPower TP3005N amzn.to/2TeQnxI
Power Supply 2: RUIDENG DP50V5A amzn.to/2sNicSe
Signal Generator: JS2800 ban.ggood.vip/...
DMM1: Owon18B amzn.to/2SbIGLs
DMM2: Aneng 8008 amzn.to/2sNQncI
DMM3: Aneng 8009 amzn.to/2S5qeEp
DMM4: Uni-T UT801 amzn.to/2S89SuL
Soldering Station1: Zeny (Yihua)862D+ amzn.to/2S49z4e
Soldering Station2: KSGR T12 amzn.to/2Wk7Dn9
Light Meter Smart Sensor AS803 amzn.to/2B2gyRg

[@michaelpadovani9566]

A simple low pass filter is, in my opinion, one of the best ways to smooth out noisy data. And you made the process even more simple by your demonstration here - nice job!

[@learnelectronics]

Thanks. How's the new little one?

[@michaelpadovani9566]

@@learnelectronics Eating all the damn time!! Otherwise healthy and growing quick. Thanks for asking :)

[@friedmule5403]

This is exatly what I have been looking for! A lot of nice people out on KZbin have made "what you need in your lab" and they are very trough to get everything listed up, but none have ever made a "WHY - for what" video. So you are standing with a great list of items, but can't just imagine what it should all be good fore:-)

[@jonelectronics510]

Some of the most useful purposes for a function generator is to modulate noise onto signals so you can torture your design to see how it fails. The uses are endless really!

[@nigeljohnson9820]

The application of white noise to the input of an amplifier/ filter can be used to give a quick display of the amplifier/filters frequency response, as the output noise will be shaped by the response of the unit under test. The only caveat is that the input signal might overdrive the unit under test and may result in intermodulation products from both in band and out of band signal interactions. But this technique is still used in some RF applications, such as the testing of radio aerials and passive filters. One advantage of this form of testing is that it does not necessarily involve expensive test equipment, just an oscilloscope, a diode broad band noise source and a diode probe RF detector.

[@rolandberendonck3900]

Nice example to get an idea what to do with such a device 👍 This rookie (me) had no idea 😊

[@MikeB_UK]

May I suggest watching w2aew youtube channel video on sweep generator (vid #45). His explanation is of more practical use.

[@rolandberendonck3900]

@@MikeB_UK Thanks Mike 👍 I Will 😊

[@GeorgeWMays]

I like your videos a lot. Please keep them coming. Thanks.

[@nigeljohnson9820]

It might have been more interesting to sweep a Wein bridge filter, two resistors and two capacitors gives a resonant peak by virtue of the interaction of a low pass high pass combination. There was an instrument known as a wobbulator, that used a combination of a voltage controlled oscillator and an oscilloscope to provide a poor man's network analysiser. The sweep voltage was used to drive the scope X axis, while a peak detector connected to the scope y input was used to display the network under test output voltage. This provided a display of the network's amplitude response, a bode plot. When used at radio frequencies. It facilitated the setup of IF filters, in the day when these were made up of a cascade of tuned capacitor/inductor filters. It was very satisfying to see the network response displayed in real time, and be able to adjust the filters, by tuning the inductor cores, to give a flat bandpass response. ( I think the test equipment was called a wobbulator because of the wobbling sound it made when listened to on the receiver speaker or the speaker built into the equipment.) I once used a similar technique to tune an eight pole butterworth Sallen and Key op-amp filter, to give a maximum flat bandpass response. It turns out that such filters can be tuned by adjusting the voltage gain of each two pole section. The math functions on a modern storage scope makes it relatively easy to configure it, in combination with a waveform generator, as a network analyser . The scope can be programmed to due the log peak detection and even the phase measurement. Displaying both amplitude and phase bode plots. Very useful if you are interested in filter design.

[@manosif]

A very nice video from a very nice guy.

[@mikeoliver3254]

They are also great for isolating noise in a circuit you are trying to fix.

[@Nets-nutsBr]

Thanks for sharing that! Suggestion: Make a video using FFT function.

[@mtkoslowski]

Very good presentation. Highly instructive for a practical application. ⭐️

[@Dave_____]

It would be cool if you talked about the Peak to Peak output voltage from the sig generator and the Peak to Peak you are seeing on the O-scope and how the output loading on the sig gen impacts the readings on the o-scope. Thanks.

[@MCsCreations]

Really, really interesting!!! Thanks a lot, dude! 😃

[@Taran72]

Great video and very helpful! I didn't know I could use the function generator in sweep mode; I will check the performance of my self made inductors with this method. Thank you very much!

[@preston963]

1:18 Orange Orange Black the last time I checked some 40yrs ago till now was 33 ohm!

[@researchandbuild1751]

Thanks for this video! Something that annoys me is i built a RF highpass filter but its insertion loss is terrible, like 20db (voltage) or so, i dont know what i did wrong, the filter design tools say it should only be about 6db loss. Was thinking im measuring wrong or my equipment is messed up

[@MalagasOnFire]

It is very usefull special if you are playing with mains voltage aka triacs and want to feed sinosoidal signal to do the Zero Cross Control eg to an Arduino, before blowing something, even with opamp and opto-couplers, isolation transformer.

[@startobytes]

Hi, could you make a Video about how to use the 74hc595n with Arduino Uno

[@danmyself5341]

I saw in your comments about your hands being fat that used to be me now I've lost 92 lb and I have no more illnesses

[@ahmedsyed5629]

Great Video! This a great example For understanding function generator and oscilloscope.

[@seditiousmonkeyart]

Thanks for the explanation and demonstration.

[@HelmutTschemernjak]

Great training video, regards from Hannover Germany

[@mikeburton8687]

Don't understand all of this but a big thumbs up anyway!

[@pulesjet]

A Spectrum Analyzer would be most handy doing this. You can down load and use a Audio Freq Lap Top Software version easy enough. Always build a Interface to protect your lap top's audio input. Of Course my Lenovo LT has the most crappy audio input available and I'm limited to a single channel doing so.

[@danielmaclean4718]

Great explanation, as always.

[@bradcfi2]

Cool video. Reproduced this easy project but do not understand why the phase changed?

[@learnelectronics]

Signal slows through the filter

[@MrVosh-nj2lc]

Small point but since you're measuring a voltage wave form, isn't the 50% reduction in signal height at the -6dB level and not at the -3dB level, as it would be for power(watts)? The -3dB level for voltage is approximately 30% reduction in sine wave height.

[@TheEmbeddedHobbyist]

correct, 50% voltage drop is -6dB, dBV = 20Log(Vi/Vo) power in dB is 10Log(Vi/Vo)

[@researchandbuild1751]

Thats why i hate dB honestly its confusing to know if its for voltage or power, etc Anyway 3db is 3db

[@traxonja]

1:16 ... 33ohm actually? Or the last ring is brown. Great presentation as always, thanks.

[@Hugatry]

To me that resistors looks to have orange-orange-brown bands. Simple mistake of either seeing or just saying wrong color. Signals on the scope indicate 330 Ohm resistor with 100nF (+ some nF due to the tolerance) capacitor.

[@learnelectronics]

I misspoke

[@Chris_the_Muso]

@@learnelectronics Thanks for triggering my OCD LOL. "Orange orange black, that would be 330 ohms" gave me one of those moments.

[@bobcuyt4675]

resistor clearly is a 33 ohm, not 330. But besides misspeaking, 330 was also used in the calculation, which came out as 4,8 Khz. Now, if you use 33 in the calculation, one comes out at 48 Khz (the expected one order of magnitude difference) - which was not what we saw on the scope. What gives?

[@DigicoolThings]

@@bobcuyt4675 I do see it as brown in the video (330 ohm), so I think he just miss-spoke as "black". 330 ohms does seem to be verified by the scope, where it does appear to go through about half power (-3db) level around the 4.8Khz mark. Note that half power is approx 0.7 amplitude (voltage level).

[@unodos1821]

Is this like a curve tracer?

[@JohnSmith-bh4zx]

Interesting Video, pls keep it up :)

[@CalPil0t]

Very helpful...

[@richardhuttinger6148]

Historically, orange, orange, black is 33 ohms. 330 ohms would be orange, orange, brown. Brown stands for 10 to the first power, red is 10 to the 2nd power, etc. I checked my Radio Shack resistor calculator just to make sure.

[@somedude4122]

Depends on the number of bands. There are 5 band codes and 4 band codes. What you say is true for four band codes. 5 band codes however have three significant digits followed by a power of 10.

[@learnelectronics]

I misspoke

[@CalPil0t]

@Stevey Canuck And if you hear "From the Halls of Montezuma..." it's probably the Marine Band.

[@richardhuttinger6148]

I checked that his resistor had only 4 bands before posting. Further, he states three separate color bands, not four, so the proper standard is clear in this case. My junk box contains both types, so I not only check the color bands these days, but I also check the actual resistance with a DMM since used resistors can vary quite a bit depending on their tolerance and their history.

[@doctorbo5810]

I just became a patreon :)

[@learnelectronics]

Thank you!

[@kaybhee6]

try timebase around 1 sec....

[@MikeB_UK]

Nice try, but you really missed out on the real world use of viewing the overall reponse of something using a sweep generator. Have a watch of w2aew channel's vid on sweep generator use (vid #45). For actual measurement use I suggest watching eevblog #396 video.

[@movax20h]

Poor mans tracing gen. :) Things can be improved, and for 10MHz, it is cheap to do different ways too, but sure why not.