Easy & Cheap hobby Square wave oscillator 5 Hz-100 KC made with 2 x a NE 5532 P (schematic & demo)
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- Опубліковано 12 вер 2024
- Please read the description first. I was very interested in the properties of the NE5532P. It is a double Opamp with a very high frequency range (500 KC or 10 (?) MC).
I bought a few of them (made by Texas Instruments, by the way) to do this (first) experiment/test: make a (simple) square wave oscillator with that NE5532 that can get to the highest possible (hobby use) frequency.
I found very (!) good properties of this NE5532 Chip. It worked nice, did not get unstable, always started to oscillate, etc. Tested it up to 109 KC as oscillator.
I know that this chip normally is used as a low noise audio pre-amp in (the better) audio circuits, but here its oscillation properties were tested.
Everything important is told in the video, so I don’t have to elaborate here.
The use of that extra potentiometer that makes the frequency variable (470 K) via that series capacitor of 39 NF in that line is (could be) optional. Not necessary when you want to make it for 1 or a few fixes frequencies, via that rotary switch.
I am also talking about the setting (in a limited way) of the duty cycle, via the two 47 K potentiometers. Could be useful when experiments are done. You can also used fixed value 47 K resistors instead of these potentiometers, when changing the duty cycle is not necessary.
Thus when you skip/omit the “extra frequency dependent bridge capacitor with its 470 K potmeter in series, that 39 NF” you can use fixed frequencies at the output of the second NE 5532P.
They are going from 5 Hertz or lower, that depends on the value of the electrolytic capacitor, to (say) 100 KC (say with a 57 pF or smaller value capacitor).
I think it is a useful, simple & cheap circuit for everyone interested in electronics. The chips cost 60 Cents in the Netherlands.
Best property: the square wave is not (!) generated in a digital way, thus not via steps via an A-D converter.
When sine waves or square waves are digitally generated and the amount of steps (stepping up the voltages) is too low: such an oscillator cannot be used to test (say) the properties of an audio amplifier (20 Hz-20 KC).
Normally (via the analog generation of square wave signals) “how a squarewave is amplified” (oscilloscope views) can tell you everything about the properties of the audio amplifier, thus: the quality of the audio amplification (distortion, sound quality and more).
There is more info about that issue/test method on my YT Channel, thus: how, with squarewaves, you can judge the properties of an audio amplifier (20 Hz-20 KC), especially in the lowest frequency band, going from say 20 or 50 Hertz to (say) 400 Hertz.
When I have time I will give the link.
Anyway: I think this/could be a a useful circuit for the hobby electronics workbench.
My You Tube channel trailer is here: • Radiofun232 on UA-cam...
Type there (on my Channel Trailer) the keywords that you like in the “looking glass” = search function” and give “enter”. Via that you can find specific video’s (under the say 1550 published).
When you search, search always “NEWEST FIRST” to get the right overview.
You can thus search via the “looking glass” on my Channel trailer via keywords like ”audio”, “radio”, “amplifier”, “filter”, “Shortwave”, “transistor”, “FET”, “oscillator”, “generator”, “switch”, “schmitt trigger” , “filter” “Muvib” “”Multivibrator” “pre” “pre amplifier” “amplifier” “audio amplifier”; so the electronic subject (word) that you are interested in.
My books about electronics & analog radio technology are available via the website of "LULU”, search for author “Ko Tilman” there. www.lulu.com/s....
I keep all my YT videos constant actual, so the original video’s with the most recent information are always on UA-cam. Search there, and avoid my circuits that are republished, re-arranged, re-edited on other websites, giving not probable re-wiring, etc. Some persons try to find gold via my circuits. I take distance from all these fake claims. Upload 3 August 2024.
Important: you can also make this circuit with only 1 (one) NE5532. In that case take the signal out of pin 1, opposite to ground/mass/minus.
You can also make the oscillator with only 1 (one) NE 5532. Take the squarewave out via pin 1, opposite to ground (minus), via a capacitor of 470 N. Or without a cap (DC driving).
@@radiofun232 Thanks. Oh I think the NE5532 is a better op-amp then the old uA741 op-amp. Your thoughts?
@@MsFireboy2 Yes, the best property is that the frequency band is higher and there is a somewhat lower noise figure. Though in many cases (also in audio) the 741 can do the job.
Very interesting circuit. I will build it. I saw one person in the comments ask about your garden. I see your bell peppers are growing good.
Yes, in my garden all is OK. Though the harvest is small (in size). Perhaps due to the cold spring.
Thank you from England
I like your experiment on wooden boards ,I also use plywood for my experiment CKT. Love from INDIA.
Thanks, always a good idea: good insight and overview when making circuits, compared to the schematic.
Interesting circuit, thankyou for sharing 😊 👍
You are welcome, useful for the hobby or even professional workbench.
This is interesting 💭
Thanks.
2:15: no, it's not! :D
check again, in TI datasheet there is nothing about IN+ being connected, i think you checked Philips datasheet, where you can find the internal diagram, but you don't zoomed enough, and got ground connection as being a link between positive inputs... :)
i was almost sure about that, too, but i zoomed the pdf more, and... eh... age! :)
The TI datasheet only shows one of the two Opamps. There a 2 in the package. What you say could be true, when we look at page 8 in the TI datasheet, the example/schematic there. There is no clear description about this question in the TI datasheet. But I write for a broad public on UA-cam and must be sure that my circuits always work, even when someone uses an older type of this chip. Thanks. 7 aug. 2024.
I'm also interested in sine wave oscillators that operate in RF ranges, like 1.8MHz to 30MHz and even 145MHz.
On my YT Channel there are many oscillators. They go to max. 18 MHz. In the description you can read how you can find them, via the "search option" (looking glass) on my channel tyrailer (Radiofun232 on UA-cam).
@@radiofun232 Is it somehow difficult to make an oscillator for 145 MHz?
@@PaulaBean yes, when it must be stable.
@@radiofun232 Perhaps we can use a crystal?
@@PaulaBean Hello Paula Bean I am not going to communicate further because you did not answer my question + you deny that you have a UA-cam Channel. And: my channel is not a forum and I cannot answer the type of question that you ask ("perhaps we can use a crystal"). Sorry. 9 aug. 2024.
😎
Thanks Steve, just made a sinewave oscillator with it for HF, 151 KC - 393 KC. Will publish it. 4 Aug 2024.
Thanks for posting. Have you ever tried a JRC 4558 dual op-amp?
No, I never tried it. Going to look at the datasheet.
@@radiofun232 I have used the NE5532 dual op-amp chip. It seems to not do very well at higher frequencies.
@@MsFireboy2 Yes, I saw the datasheet. My idea is that it does not go higher than 500 KC, but anyway, that is no fact....Thanks.
How is the garden 🏡
Doing well, saved a lot of water in spring. Used it now. Bell peppers and other peppers (long-green types) are growing OK. Tomatoes must ripe. Everything has to ripe more, it needs time. Thanks. 3 Aug. 2024.
We're can I purchase this chip!
I think "everywhere" on the www. Say via the Dutch website of budgetronics, you can Google it. 3 Aug 2024.
@@radiofun232 I will doo thanking you again