Thanks for the demo Eddie. Hopefully Uni-T let you borrow this SA for a long time so we can see you do a lot more testing and tutorials on it. While this SA is way out of my budget for hobbyist use, I’m still learning a lot from your videos. I would also love to see you do a review of the tinySA ultra and compare it with this Uni-T SA. I haven’t purchased one yet but would love to see your input and your thoughts about it.
Not a lot of content on isolated supplies on UA-cam, but it's critical for industrial applications. Would be great for the hobby guys to understand and use it to. Hope you can make some videos about it. Would me awesome.
Maybe I missed it, but averaging is your friend. Repetative signals will come out and random noise will get flattened out. Hence if it flattens out, it is random / asynchronious. Try it with averageing of 16 samples or more. Also if you have jitter the width of the signal will broaden. Can it hold a stored signal and superimpose this over the current display?
Thanks for your feedback! Yes averaging can be a friend;) I'll get more into the features as I go on. I appreciate any feedback and/or suggestions/recommendations on what I can cover and how. Yes this can save images and can be used for comparison.
I use those same probes, really I would call them glorified transmission lines 😊 with the "TinySA" spectrum analyzer. I hope that you might demo one of those tinySA's if you haven't in the past. Very very low cost,.they also do double duty as signal generators, and set up Smith Charts... So small, it fits in your hand, about fifty dollars! You can also use one of those probes and actually walk around until you find an interfering appliance, thermostat, wall wart, or burger alarm keypad, and then? Just smash that with a hammer and presto your noise source is gone! 😅 You thanked me for my service as a Nurse. Notwithstanding, I must thank you for your service in the defense industry. You may have saved lives too, you never know. Maybe even RIGHT NOW, with the very arms that we send to defend the Ukrainians. And? While you could just kick back with a cold one and watch tv, it's YOU who are reaching the next generation of engineers and scientists, and it is they who will go places and do things that we dream not of, because of your very efforts. All the Best! 73 DE W8LV Bill
Hi Kiss, always wonderful videos.... What kind of antenna you used to search the signal into the amplifier? I saw the UNI-T kit UTSEMI01, In your opinion those antenna will be ok?
Kiss, If you can help me, this morning I try to firmware upgrade but usb port don't play, I try with 3 different usb device but don't run. How I can try?
I just built a little bridged amp using two TDA2003's and with no input it is wildly unstable. I don't have a spectrum analyzer, but I do have an oscilloscope. Any ideas how to diagnose the problem?
@@KissAnalog Thanks for the replay. How would I send you a photo? I put a voltage divider / potentiometer across the input and it stopped squealing. The amp is stable and working now sorta , but it sounds clipped with only a little volume. This is a bridged circuit using two TDA2003's (based on datasheet example), maybe I damaged one of the IC's when it was unstable, due to excessive internal feedback? Or what do you think might be causing the clipping? Before I try replacing the IC's, I think I'll try hooking it up with a sine-gen and look at the distortion with my scope.
Thanks. I do have another tripod that I usually use. Once you find the noise - and if it is too high - then you know you need to correct it. Knowing the type of noise can help you find where it is coming from and help you change the design to get lower levels.
I have a sweet JBL 3 channel car amp. It has class A/B for better sound quality for the front woofers & tweeters and a class D amp for tons of efficient power for the subwoofer. I wish they made ALlOT more amps like mine for car Audio as it makes for an awesome soundstage and a much simpler installation. Even without a true 14.4v charging system from a high output alternator it puts out way more power than my awesome 10” Boston Acoustics sub can handle. Love all that headroom. I hope your well man. Keep smiling please and Keep up the great work. P.s. I wish we lived nearby you’d take me on as an apprentice. You got serious skills and a kick ass personally. I know plenty of brilliant guys like you and my father but unlike you and my dad allot of them have terrible personalities. God bless.
Thanks so much for your kind words! It seems that some are afraid of Class D but they think it is probably ok to use for Sub Woofers, so I think that is what drove the design that you have. I think more and more - Class D are being accepted as great sounding amps, so I think the Class A/B amps are being replaced now.
@@KissAnalog i was wrong the large signal in the middle with exactly the same signals left and right i recognises as Intermodulation of another signal that is appears left and right from the carrier in the middle, hope you understand the double dutch 🫤
Hi Eddie, nice demonstration. Thank you for the video. 👍😀
Glad you enjoyed it
Thanks for the demo Eddie. Hopefully Uni-T let you borrow this SA for a long time so we can see you do a lot more testing and tutorials on it. While this SA is way out of my budget for hobbyist use, I’m still learning a lot from your videos. I would also love to see you do a review of the tinySA ultra and compare it with this Uni-T SA. I haven’t purchased one yet but would love to see your input and your thoughts about it.
Thanks - I hope I can keep it for a bit longer;) I do have a tinySA and have meant to review it - so now that I have this - it is the perfect time;)
Interesting stuff. Seeing spikes up to 6Mhz was unexpected. Thanks.
Thanks - it is interesting to see these high frequencies. It can really help you optimize a design for lower noise - if needed.
Nice video. Appreciate your content. Would love to see some isolated DC DC 48/24/12vdc to 12/5vdc videos.
Thank you! I'll get my new power supply back in gear here very soon.
Not a lot of content on isolated supplies on UA-cam, but it's critical for industrial applications. Would be great for the hobby guys to understand and use it to. Hope you can make some videos about it. Would me awesome.
Maybe I missed it, but averaging is your friend. Repetative signals will come out and random noise will get flattened out. Hence if it flattens out, it is random / asynchronious. Try it with averageing of 16 samples or more. Also if you have jitter the width of the signal will broaden. Can it hold a stored signal and superimpose this over the current display?
Thanks for your feedback! Yes averaging can be a friend;) I'll get more into the features as I go on. I appreciate any feedback and/or suggestions/recommendations on what I can cover and how. Yes this can save images and can be used for comparison.
I use those same probes, really I would call them glorified transmission lines 😊 with the "TinySA" spectrum analyzer. I hope that you might demo one of those tinySA's if you haven't in the past. Very very low cost,.they also do double duty as signal generators, and set up Smith Charts... So small, it fits in your hand, about fifty dollars! You can also use one of those probes and actually walk around until you find an interfering appliance, thermostat, wall wart, or burger alarm keypad, and then? Just smash that with a hammer and presto your noise source is gone! 😅 You thanked me for my service as a Nurse. Notwithstanding, I must thank you for your service in the defense industry. You may have saved lives too, you never know. Maybe even RIGHT NOW, with the very arms that we send to defend the Ukrainians. And? While you could just kick back with a cold one and watch tv, it's YOU who are reaching the next generation of engineers and scientists, and it is they who will go places and do things that we dream not of, because of your very efforts. All the Best! 73 DE W8LV Bill
Thanks - did your comment get deleted?
Hi Kiss, always wonderful videos.... What kind of antenna you used to search the signal into the amplifier?
I saw the UNI-T kit UTSEMI01, In your opinion those antenna will be ok?
Thank you! I appreciate you! Here's a link - and they are very low cost;) amzn.to/45NhyG5
Kiss, If you can help me, this morning I try to firmware upgrade but usb port don't play, I try with 3 different usb device but don't run. How I can try?
I just built a little bridged amp using two TDA2003's and with no input it is wildly unstable. I don't have a spectrum analyzer, but I do have an oscilloscope. Any ideas how to diagnose the problem?
Purchase a TinySA. Fifty bucks or so, you hold it in your hand, and you have BOTH an RF gen AND an SA to go along with your scope!
@w8lvradio, Thanks for the great comment!
Thanks for asking. Try shorting the input to be sure there isn't something going on there. Can you send a picture? Have you found the problem?
@@KissAnalog Thanks for the replay. How would I send you a photo?
I put a voltage divider / potentiometer across the input and it stopped squealing. The amp is stable and working now sorta , but it sounds clipped with only a little volume. This is a bridged circuit using two TDA2003's (based on datasheet example), maybe I damaged one of the IC's when it was unstable, due to excessive internal feedback? Or what do you think might be causing the clipping?
Before I try replacing the IC's, I think I'll try hooking it up with a sine-gen and look at the distortion with my scope.
Guess you need another tripod so no need to hold the camera with hand. What can we do after finding the noise?
Thanks. I do have another tripod that I usually use. Once you find the noise - and if it is too high - then you know you need to correct it. Knowing the type of noise can help you find where it is coming from and help you change the design to get lower levels.
If you sampling frequency is 384x the highest frequency you want amplified then a bandstop filter should give a nice clean signal.
Thanks for the tip!!
I was expecting switching frequency to be clearly visible from the beginning. Weird.
Yes - I thought the same. I'll look more into this;) Thank you!
Maybe it's time to build a smps with an appropriate PF correction.
Thanks - you are right! I will get back to this playlist where I started a PFC design: ua-cam.com/video/bcRlCWVCW6w/v-deo.html
You should put a valve buffer stage on the class d amp give it a nicer sound something like VTV about $100 with discrete opamp
Thanks for the suggestion. That could be an interesting idea;)
I have a sweet JBL 3 channel car amp. It has class A/B for better sound quality for the front woofers & tweeters and a class D amp for tons of efficient power for the subwoofer.
I wish they made ALlOT more amps like mine for car Audio as it makes for an awesome soundstage and a much simpler installation. Even without a true 14.4v charging system from a high output alternator it puts out way more power than my awesome 10” Boston Acoustics sub can handle. Love all that headroom.
I hope your well man. Keep smiling please and Keep up the great work.
P.s. I wish we lived nearby you’d take me on as an apprentice. You got serious skills and a kick ass personally.
I know plenty of brilliant guys like you and my father but unlike you and my dad allot of them have terrible personalities.
God bless.
Thanks so much for your kind words! It seems that some are afraid of Class D but they think it is probably ok to use for Sub Woofers, so I think that is what drove the design that you have. I think more and more - Class D are being accepted as great sounding amps, so I think the Class A/B amps are being replaced now.
Hello 👋
Hello 👋
Stick to 16384 Bins or the sweep will start getting slower.
Thanks! What RBW and VBW do you like?
At 10 k you are at your own oscillator freq
Oscillator is 10 MHz right;)
Th signal low high higher that are imd
Thanks but not sure what you mean.
@@KissAnalog i was wrong the large signal in the middle with exactly the same signals left and right i recognises as Intermodulation of another signal that is appears left and right from the carrier in the middle, hope you understand the double dutch 🫤
I had it wrong 😊
Feedback is always appreciated;)