7 жыл бұрын
Пікірлер
@kdaudio95 3 күн бұрын
Where can i purchase these preamps?
@Roys_Desk 3 күн бұрын
Hey 👋, The contact information of Vipin is in Description!! And also in Starting of the video !!
@Elite0001_art 4 күн бұрын
Sir indian xtreme audio ka tone control board ek baar check kar sakte hai, apko bahut acha lagega 🎉
@Roys_Desk 4 күн бұрын
Yes I was thinking of checking that … uska design dekh kar accha lag raha h !!!
@Elite0001_art 4 күн бұрын
Sir i think that preamp performed better than previously used ultimax preamp board. Right?
@Roys_Desk 4 күн бұрын
Yes yes right …
@mafhper 4 күн бұрын
Quero fazer algo parecido com o LM3886, mas aqui no Brasil não acho transformadores toroidais com facilidade. Vai de transformador tradicional mesmo.
@Roys_Desk 4 күн бұрын
You can use EI core transformers also . If you are worried about the magnetic field interference then you can shield the transformers with a metal sheet
@mafhper 3 күн бұрын
@@Roys_Desk yes of course. I have been improving every aspect of my amps. Your videos and other good ones have also helped me a lot. This type of transformer you mentioned, EI core, is the most common around here. That's why I've been reading and watching a lot about good circuit power supply designs.
@Roys_Desk 3 күн бұрын
Really Good to hear my videos are helping you …. Do you know about Capacitor Multiplier circuit?
@mafhper 3 күн бұрын
@Roys_Desk Yes, of course. I have some experience with discrete amplifiers that use MOSFETs. I learned a lot by building some kits. When solving problems I always resorted to the literature (where I learned about multiplier factor capacitors). I've been reading the Audio Power Amplifier Design Handbook by Douglas Self.
@Roys_Desk 3 күн бұрын
Great book my Friend 😊😊
@Roys_Desk 4 күн бұрын
Merry Christmas 🎉 and Happy vacation guys 😊❤❤
@amitdas-fp1rv 7 күн бұрын
can you sell one of these boards?
@Roys_Desk 6 күн бұрын
I do have 4 of these boards left (empty pcb)… But I would really recommend you to get the gerber files of the new design … since this design is having one silk screen and one pitch related flaw.
@b_70_saurabhvishwakarma84 8 күн бұрын
How much time does robu take to make and deliver the pcb
@Roys_Desk 8 күн бұрын
For me they took total 20 days to deliver!!
@UltimaxAudio 8 күн бұрын
Thanks for such a great video 🎉.
@Roys_Desk 8 күн бұрын
@@UltimaxAudio Thanks Brother… really liked the cabinet 😊😊
@suvamdas5470 8 күн бұрын
Is wala cabinett ma Power amp sirf banaiya Aag sa ek chota cabint ka undar preamp section karo To best hoga
@suvamdas5470 8 күн бұрын
Ic ka board ma fedback resistor ka sath jo ma caapasitor lagta ha us capasitor ka value kitnaa diya
@Roys_Desk 8 күн бұрын
@@suvamdas5470 M soch raha tha ki preamp cabinet k andar hi daal dunga … but bluetooth section separate box m rakhunga… iss cabinet m sirf rca jack or 3.5mm jack ka input rahega
@Roys_Desk 8 күн бұрын
@@suvamdas5470 Feedack k saath jo capacitor rehta h uska value 120uf daala h
@suvamdas5470 8 күн бұрын
Schematic diagram ma to 470uf ha
@suvamdas5470 8 күн бұрын
Bass treble preamplifier blutooth aaa sab alag ek cainet setion hoga to best hota
@analoghardwaretops3976 9 күн бұрын
Power (AUDIO) Mute during switch ON & switch OFF should be provided.
@Roys_Desk 8 күн бұрын
@@analoghardwaretops3976 They have provided one DpDt type switch … I couldn’t fully understand which switch you are referring to !!
@analoghardwaretops3976 8 күн бұрын
@@Roys_Desk It's not a manual switch....... (..In general for any amp . & not referring to this one..) but a circuit ..that mutes the audio before full power is applied( i.e.before filter caps.are charged up fully)..and also when power fails or is sw. off. both are time & voltage dependent/detect...and.. 1) operates a relay to break speaker outputs.. 2)mute enables/disables the audio at 1 or 2 or 3 audio gain input stages in the amp. chain.
@Roys_Desk 8 күн бұрын
@@analoghardwaretops3976 There is a delay circuit already in the lm3886 board … but it doesn’t act as a soft start for the capacitors… What you are suggesting here is a mix of many different protection circuits. 1. I’m not bothered about the inrush for capacitors . 2. It wont produce a pop sound at the starting because of the inbuilt delay circuit of lm3886 3. Lm3886 comes with a huge list of protection features and thats why Im not going to design any speaker protection circuit or a current limit circuit,
@_Ms.Roy_ 9 күн бұрын
Informative video! 👍🏻
@Roys_Desk 8 күн бұрын
@@_Ms.Roy_ Thank you 🫣🫣
@palrajraj6506 9 күн бұрын
Very useful video nice bro
@Roys_Desk 8 күн бұрын
@@palrajraj6506 Hey thanks bro 😊
@Elite0001_art 10 күн бұрын
Sir. Please suggest best hi quality bass treble board, main bahut sara board isse pehle istemal kiya tha per acha nehi , Ap ek Bass boosted high quality sound ke liye bass treble board suggest kijiye
@Roys_Desk 10 күн бұрын
Hey 👋 …. You can contact Vipin once - 8920599797 . He developed one great tone control board recently . I will be soon uploading one review video on it .
@SamYt-t1g 12 күн бұрын
Thank you bro for power distribution 😊
@Roys_Desk 12 күн бұрын
Welcome bro 😊
@palrajraj6506 15 күн бұрын
Bro i also have a lm3886 ic bought from Mosuer USA
@Roys_Desk 15 күн бұрын
Wow great … didn’t they mess-up in the customs??
@palrajraj6506 15 күн бұрын
My relative purchased from me no custom issues
@palrajraj6506 15 күн бұрын
Do you have idea about circuit basic PCB board ?
@Roys_Desk 15 күн бұрын
You have to order the pcbs from robu or lion circuits. In the website of circuit basics you will have the pcb design … which you can copy paste in easy eda software then generate the gerber file and order pcbs.
@palrajraj6506 15 күн бұрын
Ok I saw the circuit basic design they used premium electronics components used for design like silver mica capacitor and audio grade capacitor and resistors .
@ovalwingnut 16 күн бұрын
GR8T job! Very interesting.. I didn't realize that this could be done. Besides determining the "inductance" I find it helps me understand more HOW THING WORK. Very COoL. Also, really good post editing, video and audio. I even liked the choice of matt material you have as a back ground (I don't know why:). Your video is very sub-worthy. Glad I stumbled upon it. You RoCk! Cheers from So.Ca.USA 3rd house on the left.
@Roys_Desk 16 күн бұрын
Hey Thank you so much 😊 … Well the matt is a Food Grade Eva Multipurpose Shelf Liners Mat Roll For Kitchen Drawer 😂… which was the only cheap thing available which I could use as a matt.
@ovalwingnut 16 күн бұрын
@@Roys_Desk Very COoL. The old F.G.E.M.S.L "mat". (you know your mats!!). At least now if that 'mat style goes viral the world will know who to credit. Anyway.. thanks for the shout out. I'll stay tuned. Cheers R.D.
@Roys_Desk 16 күн бұрын
@ Thanks for the Support brother 😊😊😊😊
@SatyajitRoy2048 20 күн бұрын
Nice arrangement. Where are you located Bro ?
@Roys_Desk 19 күн бұрын
Thanks brother 😊…I stay in Bangalore
@karurmoorthielectronics8828 18 күн бұрын
Contact no
@b_70_saurabhvishwakarma84 20 күн бұрын
Nice video
@b_70_saurabhvishwakarma84 20 күн бұрын
Can you explain the ringing
@Roys_Desk 20 күн бұрын
Capacitance directly at the output of an amplifier can cause time delays between the input and output pins. These time delays are called phase shifts between the output and feedback nodes, which can result in oscillations at the output of the amplifier. That is why Miller capacitor in an amplifier can somewhat reduce these phase shifts.
@dalvindersingh6667 20 күн бұрын
These hi pass filters available for sale
@Roys_Desk 20 күн бұрын
No no … but you check part 5 for circuit diagram Best High Pass Filter Circuit |-24dB/Octave |Amplifier Project Part 5 |DIY Preamplifier #diy #video kzbin.info/www/bejne/e2quZoNpjr-Jgck
@rogerwalter2500 20 күн бұрын
Do you use mica washers for isolating heatsink? What is the max freq you can hear or measure from Doogee Sound tweeters?
@Roys_Desk 20 күн бұрын
Yes yes I used mica sheets for isolating the tab of the ic and plastic washer for isolating the screw from the tab. My hearing ability is till 18khz … so I could hear it till that point 🫢.
@suvamdas5470 21 күн бұрын
Nice bro
@Roys_Desk 21 күн бұрын
Thank you bro 😊
@mafhper 21 күн бұрын
Cool transformer/toride. I can't find it easily here in Brazil. LM3886 is one of my favorites
@Roys_Desk 21 күн бұрын
Here in India there are reliable sources like Galaxy transformers to get these toroidal transformers. Yes me too !! Lm3886 is really a great chip.
@markderlo212 21 күн бұрын
problem with this method is that the freq generated is also dependant on supply voltage
@Roys_Desk 21 күн бұрын
Even though the energy stored in the capacitor depends on voltage, the resonant frequency is a function of L and C alone. Therefore, changing the applied voltage in a parallel LC circuit does not change the resonant frequency. You can go ahead and test it … you will get same frequency even if you change the supply voltage
@animeshmanhasiya260 23 күн бұрын
Blank pcb available sir
@Roys_Desk 22 күн бұрын
Yeah I have 6 pcs in total …. But I would recommend to get the gerber files from me and order the pcbs from some website (like robu or lion circuits) , since there are some flaws in the pcb
@prashanthhj7348 23 күн бұрын
Thanks for the series. I do build speakers and amplifier as hobby taking time out from my day job. I appreciate your efforts to educate viewers. Tired of seeing videos like 'damakedaar awaaz' kinds. Also, could you provide contact from where you purchased jbl drivers? And download link of the Gerber files.
@Roys_Desk 23 күн бұрын
@@prashanthhj7348 Hey 👋 Thank you ☺️ Speakers contact - 98106 38088 Gerber file - drop me a hi in this mail id [email protected]
@Pingle-u1i 24 күн бұрын
Sar mujhe 5PCB chahie milegi kya because I have original IC
@Roys_Desk 24 күн бұрын
Yes I do have 5 PCBS but … I would recommend to get the gerber file from me and order the PCBS from Robu or lion circuits …. Since there are some minor flaws in these PCBS
@colombowala 26 күн бұрын
Hi Roy, any plans of making speaker protection circuit video in future
@Roys_Desk 26 күн бұрын
Hey … yes yes I sure do have plans to make speaker protection circuits.
@colombowala 26 күн бұрын
@Roys_Desk I used C1237HA from aliexpress, all fakes. So something based on transistors would be preferred with pcb layout
@SatyajitRoy2048 26 күн бұрын
Any amplifier will perform the same way for this kind of sweep test. What is more important about LM3886 is it's THD+N performance and this couldn't be done via this setup. However, using you computer AUX input with some attenuation and proper software, you can easily manage to do this kind of tests. Spekaer output will pump in the required sweep with clean waveforms. A decent Sound card might even add some icing on the cake. But definitely a proper reponse test you tried to explain not like others who invariably show woofer cone movements. That's kind of rubbish. Waiting to see more videos like this.
@Roys_Desk 26 күн бұрын
Yes Brother … even I wanted to test the distortion performance of the amplifier . And the easiest way to test THD is to send a signal with a pilot signal induced in it , so that we can check and compare the harmonics in FFT mode of the scope . But my scope doesn’t have FFT in it 😞. But Yeah I really need to figure out something to test the THD in a cheap and easy way .
@SatyajitRoy2048 26 күн бұрын
@@Roys_Desk You cant have proper result unless you sample the signal with higher resolutions. Normal scopes or even standalone scopes are only 8 bits so can't get the right result. better way is to use sound card. Search THD measurement with sound card borgmann
@Roys_Desk 26 күн бұрын
Sure … will check this out
@SatyajitRoy2048 26 күн бұрын
@@Roys_Desk In case if you are passionate about Audio then search QA403 Audio Analyzer. That's the best Audio analyzer tool in affordable price. There are so many available Pro grade Analyzer from Keysight or R&S but they are beyond the reach for most people
@suvamdas5470 29 күн бұрын
Nice
@Roys_Desk 29 күн бұрын
Thanks 👍
@NandhaKumar-zl6tf 29 күн бұрын
First comment
@Roys_Desk 29 күн бұрын
Appreciate it brother 😊😊😊😊😊
@rogerwalter2500 Ай бұрын
from where did you sourced C3 3.3 uF input coupling cap. and should we use bipolar electrolytic cap (C4) instead of regular cap. Can we use COG SMD 47 pF ceramic cap instead of thru hole cap?
@Roys_Desk Ай бұрын
1. The WIMA caps (C3) I recently sourced from local market SP ROAD in Bangalore 2. Yes bipolar caps can be used in C4 3. Yes COG caps would be a great choice . Best would be Silver Mica (but its pretty costly).
@rajeeshraman9982 Ай бұрын
This fake ic😂😂😂
@Roys_Desk Ай бұрын
Okay bro 😂😂😂
@rajeeshraman9982 Ай бұрын
This fake ic not original
@Roys_Desk Ай бұрын
@@rajeeshraman9982 It is 100% original ic buddy … Fake ones dosent have short circuit protection or thermal shutdown . Neither they can produce 50 plus watts .
@rajeeshraman9982 Ай бұрын
@Roys_Desk no original ic
@palrajraj6506 15 күн бұрын
It is 💯 original IC Lm3886T/NOBE
@nirupambhowmick481 Ай бұрын
Everything is fine except those 100nf supply decoupling caps, if possible use 1-2.2uf mkt film per rail. The big blue ceramic is also not good(if used for coupling, low pass or in feedback network), use NPO/COG or at least X7R type. Otherwise everything is fine. I expect you'll take this observation in a good way. Good luck
@Roys_Desk Ай бұрын
Hey Brother … Thank you for the points . That big blue capacitor is actually one NPO type capacitor of 47pF value ….But best is Silver Mica for pF ranges since they have excellent stability throughout the audio frequency range.
@aneeshchandran Ай бұрын
Is there any difference in sound quality with zobel network ( Ultimax board ) and without zobel network ( your PCB ) . Anyway Great effort 👍 keep it up 👍
@Roys_Desk Ай бұрын
Thank you so much ☺️ 1. Im having zobel network in my PCB . I think you mean Thiele Network. If you are asking about Thiele Network then I have not included that inside the PCB but I have it connected as an external component. If you see during sound test I have that coil connected between the output and the woofer. 2.Thiele Network is a must component for LM3886 …. Or else it would sound very unstable and uneasy under various scenarios.
@NandhaKumar-zl6tf Ай бұрын
Sir how much copper guage
@Roys_Desk Ай бұрын
I think this coil was 20AWG …. But For THIELE NETWORK best suited would be 18SWG . Anything in the range of 1mm to 1.2mm
@UltimaxAudio Ай бұрын
Great work! 🎉
@Roys_Desk Ай бұрын
Thank you 🤩 🙏
@suvamdas5470 Ай бұрын
Us board ka details video banaiya jaldi
@Roys_Desk Ай бұрын
Yes yes Soon …. Editing chal raha h abhi 😊😉
@Baaz9898 Ай бұрын
Bhai, induction coil me megnatic field ko kis circuit ki madad se badhaya jata he...??
@Roys_Desk Ай бұрын
This is a different topic in itself . But induction coil and the cookware behaves like a loosely coupled transformer(secondary sorted )… so more current means more power and this more current is handled by a Pulse Jo ki IGBT ko input kiya jaata h . This pulse duration is monitored by the microcontroller depending on the current requirements. Ye complicated circuit hota h and bohot kuch monitor karna padhta h .
@Roys_Desk Ай бұрын
Hey Guys !!! Seems like I made a mistake in putting the B cursor for Time Period measurements of first three Inductors . I had to place the B cursor exactly at the point where the negative waveform touches zero line . The last measurement (0.2uH) is proper 1Time period and thats the proper placement of A and B cursors.
@garywashington9391 Ай бұрын
It seems that for a sine wave the first cursor at zero and the second cursor at zero, one wave length away or peak to peak is needed. You seem to have used a period and a half.
@Roys_Desk Ай бұрын
@@garywashington9391 Yes You are right !! …. I noticed I measured the Time period a bit higher for the first three measurements …. In the last one (0.2uH ) I have fortunately placed the cursors at the right place 🥲.
@thethoughtfield Ай бұрын
a period and a quarter actually
@Roys_Desk Ай бұрын
@thethoughtfield True it was about 1.2T … but I hope the idea stays clear irrespective of the small measurement errors !!
@ch2o2 Ай бұрын
nice, but as far as I can see (9:30) you're measuring 1,25 T, not 1T with your cursors ...so the real frequency of the ringing is about 1,25 higher
@Roys_Desk Ай бұрын
True … even I noticed now … I measured the Time period higher (should be around 720nS)…. Which means frequency is supposed to be higher than 1.28Mhz and technically the value wont drift too much than the calculated value even with the new frequency.
@thethoughtfield Ай бұрын
I was just about to comment the same
@manmeetjammu Ай бұрын
❤
@Roys_Desk Ай бұрын
Thank You 🙏
@suvamdas5470 Ай бұрын
Is board ka upar sound testing ka upar video banaiya please
@suvamdas5470 Ай бұрын
Is board ka upar purs details video banaiya na please sir
@Roys_Desk Ай бұрын
Haan bhai …Coming Soon 😊…. Time kam mil raha h thoda
@adnanmahmud875 Ай бұрын
I wish someone would design an all-in-one amplifier circuit with a built-in preamp. Anyway thank you for your hard work.
@Roys_Desk Ай бұрын
Thank you brother 😊…. Yeah maybe an idea for future project !!!
@SivanSivan-l5h Ай бұрын
சூப்பர் வெரிகுட்
@Roys_Desk Ай бұрын
Thank You 😃
@NandhaKumar-zl6tf Ай бұрын
Why low pass rc network changed single supply and split supply
@Roys_Desk Ай бұрын
You mean to say the values of the RC network is different in single supply and split supply circuits?
@NandhaKumar-zl6tf Ай бұрын
@Roys_Desk yes sir
@Roys_Desk Ай бұрын
Different values to have different cutoff frequencies (Fc)… mainly to show how it sounds at two different cutoff frequencies!!!
@DIYElectronic-b3j Ай бұрын
Pls sir 1p give pls
@Roys_Desk Ай бұрын
Yeah Sure brother …. But let me test it first 😊