and one from amp to receiver. Youll especially need a star ground configuration in a wooden case. It doesnt seem to work, is it just me? The 20K resistor shows up in the Stability Components Rf2 & Cf section. I would really appreciate any help before I take every component one after the other. I used solid core 22 AWG, which works well because it can be twisted into a tight coil. Its not fancy audiophile cable but the tight, twisted +&- pair has been used successfully by a lot of builders. i`m really a new i the pcb design is it possible to get the cad file for pcb layout so i can order the pcb.. would really appreciate it. Truly fantastic stuff you got here! Repeating the Fccalculation for a 330 F capacitor gives 0.48 Hz. If that does not fix it, try bypassing the Thiele network . Hello Victor. Doing your maths, i should have a 219,34 volts/370 VA toroidal to get 68 watts. I think many of the posters are from countries where English is not the primary language. Max Output @16: 130mW (1.44Vrms). Simone: I tested my amp boards using the chipamp PS and everything works fine. The info you seek is there. I can send a pic and info if needed. There are many circuits on the net but again they do not explain any design aspects completely. They also filter noise and radio frequencyinterference in the power supply. A new pop-up box appears to request the info. Wonderfully and informatively written. If the hum is still there then add the power supplys neutral to the ground as well. 3331)]%^=rt]{qCnLSWi:Mc0jv]bp2BzrUG(d%,K=$Rp B%^oDnm[L>}D.y=:^"FAK-on0*r] .WfA!rf232G: ~UJs(syl6gvmdBq&Wi} 5&:qKvwzg|ACvb="8/d No electrical contact exits. The main system ground connects to the ground protection circuit (discussed below), which then connects to the chassis. But if you want to experiment, decreasing the value of Cf will raise the upper Fcof the bandwidth, andincreasing the valuewill lower it. In that configuration, Ccfilters radio frequency and electromagnetic interference picked up by the input wires. All metal parts of the amplifier(likethe heat sinks) should be electrically connected to the chassisto provide a path to earth for any mains voltages that could contact them in the event of a fault. You could even add a DIV at the top of the web page with a .print-only class attribute, that is invisible when the page is viewed on a screen/tv, but would be included in the printed version. To un-mute the amplifier, we need to find avalue forRmso that thecurrent allowed to flow out of pin 8 is greater than 0.5 mA. And now I am left with these choices. Saw down the heatsnk. It came out to just under $35 per side for the components, but you have to consider the costs for the boards and power supply. Thank you! Maybe it helps other people with similar questions. Its very easy to bend them together, when they are mounted, which will result in the metal backs touching & causing a short. Im not an advanced electronics guy so no oscilloscope graphs/comparisons are gonna get posted. High frequency oscillation current will be impeded by the inductor and be forced to flow through the resistor, which will dampen it. The drawback is a bigger tolerance (10%), but they are dirt cheap compared to the Mundorf monster cap used here (WIMA MKP4F044706F00KSSD is about 1/7 of the price and way easier to find where I live). Buy Pro 1000-Watt Portable Wireless Bluetooth - Stereo Mixer Karaoke Amplifier System with Dual Mic / RCA Audio / Video Inputs, Speaker Output for Instant Home Karaoke, DJ Party - Pyle PMXAKB1000: Mixers - Amazon.com FREE DELIVERY possible on eligible purchases Nice project, good explanations, etc. I also checked to make sure that sound from my smartphone gets into the amp. I also really like how you supplied the calculations for determining the size of the components. That is what Ill be using in my amplifier. Max Output @32: 165mW (2.3Vrms) Thanks Hicoco.Dave: youll have to join the diyaudio forum and then private Message (PM) Dario Fremen (ClaveFremen) about purchasing the boards directly from him in Italy. Use this formula to calculate the maximum supply voltage required by your amplifier: For my40 Watt amplifier, the maximum supply voltage it needsis: So mypower supply will need to deliver a peak voltage of30.2 V for my amplifier to output40 Watts into 6 speakers. Larger values will improve the bass response. The way you explained all the design papameters was very useful to me. Get from a reputable supplier (components specialists rather than ebay). This is the output voltage of the audio source youll be amplifying. A single chip for each tweeter and a parallel pair for the woofers. In there you could put things like a publishing date and a copyright notice, keywords, a table of contents, (social link) URLs written in full as normal text instead of just blue words in the article, etc. Hello, I have sourced components from ebay from Russia and the Ukraine. Withsmaller values of Ci, the bass will be softer and have less punch, butwith larger values of Ci, the bass will be tighter and havemore impact. Jrgen: the gerber PCB files are referenced all the way at the beginning of the article. Alessandro Raco on October 27, 2020 at 1:32 pm I may try to make comparative measurements if I also find an 18+18 in my stuff. All of the traces and printing came out very clean and precise, and there were no defectson any of the boards. The capacitance will probably be too high to use polypropylene, so youll likely have to use an electrolytic. If I am correct the pcb layout needs to be modified to represent the difference in size between the 50pf and the 680pf. Like all the other, simple LM3886 or LM3875 gainclones Ive built the soundstage was magnificent, airy and brought detail to the music Ive never realized before with my regular amps & DAC combinations (nothing high end). With an Fc of 1.5 Hz, the value of my Cinneeds tobe: A 5.3 F capacitor will be hard to find, but a close value thats fairly common is 4.7 F. Amit: as a quick check, jumper D1 so the diode is taken out of the circuit and see if you get sound again before going through the hassle of replacing the LM3886. The bass is verydeep and clean. I have a question though. Pete Zafian on October 27, 2020 at 1:13 pm Thanks for your advice. Peak Non-Repetitive Forward Surge Current 100A, and the MURF860G In stock. If that works try setting up the Muting Circuit as designed in the original design, D1 = 16V zener diode, R5 = 10K resistor and C5 = 100uF 63V electrolytic. To calculate the output poweryoull get froma particular transformers voltage rating, use this formula: Using the maximum supply voltage I calculated for an18 V transformer (29.6 V), the output power Ill get is: 38.2 Watts of output power is pretty close to my goal of40 Watts, so an 18 Vtransformer willwork fine. Id like to see what you designed. The ground protection circuit can connect to the chassis at the bolt wherethe mains earth wire is connected to the chassis, or at a separate location. If the latter: Are there any benefits (audio signal quality or other reason) with axial capacitors with such big plates? I have measured the voltages across the C7, C8, C9, C10, C11, & C12, and the all show the supply voltage of 35V. Yuval, I built them amp just as described and Im using it with my 8 ohm speakers. There are two schools of thought here. Metal film resistors with a tolerance of 0.1% or less are ideal. A second high pass filter exists in the feedback loop with Ri and Ci: The cutoff frequencyof this filter should be 3 to 5 times lower than the Fc of the Cin\ Rinhigh pass filter at the input. Each one has its own electrically isolated ground plane on the bottom layer. Seems counter productive to use film cap on signal in, then electro for shunt, From my understanding re: bypassing capacitors https://www.diyaudio.com/forums/group-buys/330082-my_ref-fremen-edition-gb-13th-gb-6.html The large decoupling capacitors provide a lasting sourceof reservecurrent when the low frequency output of the amplifier is high. The gain of the LM3886 can be set by changing the values ofresistors Ri and Rf1. It also hasschematics for bridged and parallel amplifier circuits: Its also good to have the Overture Design Guide. The inverting input sees the resistance of Rf1and the non-inverting input sees the resistance of Rin and Rb in series. Im new to this world and im not an engineer, i made my personal research on the web, and all i understood is that a ic switch (adg1636, adg854,adg884) is better than relay switch and rotary switch. based on the typical application of the datasheet, Its not really the same thing as a truly integrated amp (pre-amp + amp) but it works for controlling volume if your signal source doesnt have its own volume control. Ill give your recommendation a try once my parts arrive. I used single sided PCB, but tried sticking to your layout as closely as possible and changed some components especially the Mundorfs for something readily available (and a bit cheaper ;) ). Our main antenna degraded with the addition of a second antenna. Peak Reverse Repetitive Voltage 600V most likely its a ground fault. Someone can correct me if Im wrong here. the GND , then the -35, then the +35. The most affordable model of the award-winning DragonFly family, DragonFly Black is a portable, plug-and-play USB DAC (digital-to-analog converter), preamp, and headphone amp that connects to laptops, tablets, and smartphones to deliver clean, clear, naturally beautiful sound to headphones, I have also learned to click every possible link when I cant find what I seek. I have just a question: in section SET THE LOW FREQUENCY CUTOFF AT THE FEEDBACK LOOP, how did you obtain the formula for Ci ? Just a heads up from me regarding the build. Unfortunately we can post pictures here so a visual inspection cant be done. thanks for sharing this great product and for making the design files available. Its also well above the upper 20 kHz frequency of human hearing, so higher audio frequencies wont be attenuated. Or is there any internal function in IC that is not allowing the IC to start working( mute circuitry ??)?? I did the directly onto the chip procedure.. it took patience. Preamps couldnt add it back in either. Going with what you measured, disconnect the tranny + PS from the amp. Tony, I think the author was using 1.1 as a factor in the calculation implying the mains voltage (=1) and adding 10% to it (10% of 1 is 0.1) hence the factor is 100% + 10% = 1.1. I would also like to see a follow up post with details on the power supply. DNR, High-gain Mode115dB Second is to place fuse at the output end of the lytics. Tea integrates the Qualcomm QCC5125 Bluetooth chip, supporting mainstream Bluetooth encoding formats such as AAC / SBC / LDAC / aptX / aptX HD / aptX Low Latency and Hi-Res audio up to 96KHz/24bit with low latency(40ms). Thanks. the answer is P10yE%SWz"wU}=*0llo9)KT~j'r[RaMKZ%n=UM7UY ["E'!sy_$T2 ;kw+$XY28mZQKU} |TIa p0'_6Nl:h!i= N The feedback loop should be kept as short as possible to reduce the loop area. I would like a kit to same the time to order them. Because Tea's battery is already fully charged. The amplifier I built sounds incredibly good. I have built a couple of the Peter Daniels Audiosector Gainclones before. Best tutorial youve ever made and one of the best available online. Usually the trans that is stated to be 18V runs a little higher, maybe 19-20V so 19+19V = 38V then times 1.4 = 53V. The minimum size of the heat sink can be found by calculating itsmaximum thermal resistance (inC/W). I put some changes in Powe supply Rectifier Type Switching Use two smaller transformers and put bridge and caps on amplifier board. Email me new tutorials and (very) occasional promotional stuff: Determine the Required Power Supply Voltage and Power, Find the Maximum Supply Voltage Needed by the Amplifier, Find the Maximum Supply Voltage Output by a Transformer, Find the Output Power from a Transformers Voltage Rating, Convert the Total Power to a Transformer VA Rating, Find the Maximum Thermal Resistance of the Heat Sink, Set the Low Frequency Cutoff at the Amplifiers Input, Set the Low Frequency Cutoff at the Feedback Loop, Set the High Frequency Cutoff at the Amplifiers Input, 330280 mm Galaxy model with a 10 mm black anodized aluminum front panel, 10 Watt stereo and bridged amplifiers with the TDA2003, How to Build a Sawtooth and Triangle Wave Generator, https://www.circuitbasics.com/design-hi-fi-audio, http://www.antekinc.com/as-4428-400va-28v-transformer/, https://www.diyaudio.com/forums/chip-amps/234032-my_ref-fremen-edition-build-thread-tutorial.html, https://www.diyaudio.com/forums/group-buys/330082-my_ref-fremen-edition-gb-13th-gb-6.html, https://www.tindie.com/products/hicoco/audio-input-selector-switch-relay-module-board/, https://drive.google.com/file/d/1pk3knK2XnM-miUWUE3pPuHc-KMmIOE6N/view, https://www.circuitbasics.com/design-hi-fi-audio-amplifier-lm3886, http://www.decdun.me.uk/gainclone_psu.html, Hot and neutral AC mains wires from the input terminal to the transformer, AC zero and secondary voltagewires from the transformer to the power supply, V+, V-, and power ground wires from the power supply to each amplifier PCB, Speaker output and speaker ground wires from the amplifier PCB/main system ground to the chassis terminals, Audio input and input ground wires from the input terminals to the amplifier PCBs. when Im trying to order the PCB for the amplifier and the power supply from EasyEDA its running DRC tests and i get many errors Pad to Copper Area Simone: your other power supply should work fine. Maximum Continuous Forward Current 8A Thank you. Rb and Cc form a low pass RC filter that sets the upper limit of the amplifiers bandwidth at the non-inverting input: In the datasheet, Cc is shown connected betweenthe non-inverting input andthe inverting input. If not how should they be connected up? The goalwith wiring is to reduce or eliminate electromagneticinterference between high current and low current wires. Output power is what youll typically see statedas the Wattage ratingof an amplifier. I listened to songs I heard hundreds of times with a slack jaw. Imho not adding controls is a good idea if you already have a control on your sound producing devices connected to this amplifier. Use low ESR bulk storage caps and minimize inductance lengths. troidial 24 0 24 with 6 /8200uf nichicon The heatsink is huge. Now after a couple of hours of listening to the LM3886 I must say it really sounds great! for signal path coupling should be at least 10% of next capacitor value so; 0.1uf, 1uf, 10uf, the reason for the 3uf polypropylene above, to link the 0.47 teflon to the 30uf polyprop However , is it possible to go directly to EDA with info you posted for the amplifier board? Or you can calculate the inductanceyourself with this formula: I used 14 AWG magnet wire in my build since its thick andeasyto find. *(I;:*[W"Dd I then switched to a 3 amp Slo Blo and every thing works fine. 522ch55ch22ch1 Happy building! Agood gain setting thats not too high to cause distortion, but not too low to give you a good range of volume is around 27 to 30 db. It will be the last big step but i need time to save some money. This produces a soft start/stop effect that gradually increases or decreases the volume instead of abruptly cutting it. for your computer you can simply download some freeware controlssoftware to alter the input signal of your amplier. Tea will ensure that your audio and video remain in sync. They will send you a pdf of the parts list and the power supply schematic + Gerber files. Im hoping you didnt ruin the LM3886 chips themselves. This is far far better than I wanted to publish, or would say THE BEST. Would be awesome to have links to getting the chosen audio components too. A complete schematic, as well as components values for the power supply will be greatly appreciated, Thank you so much in advance. Enjoy lossless audio without any compromises. First youllneed to calculatethe total power(Psupply)requiredby the amplifier. The screws are painted so do not make electrical contact. Therefore, the input filter (Cin and Rin) shoulddetermine the lower bandwidth frequency of theamplifier, not the feedback loop filter (Ci and Ri). Apple Lossless . You attached the chassis earth to the bottom plate of the case, but how are the top, front, sides and rear of the cases earthed? Unfortunately, it alsoincreases the chance foroscillation. Garry, R4 (also called Rfi) is soldered directly onto pins 3&9 on the LM3886 chip. Oops! Tea dynamically adapts to the impedance load of your headphones, from 8-300. A470F capacitor will set the Fc of myfeedback loop filter to 4.9 times lower than the Fc of myinput filter. In order to bring this down to a more reasonable level, I decided on using 4.7 for Rsnand 220 nF for Csn, which lowers the Fcdown to 154 kHz: 154 kHz is wellabove the 20 kHz limit of human hearing, andwell below any radio frequencies the speaker wires might pick up. If a high current fault occurs, the fault current can flow through the diode bridge to earth. This setup drives them quite well. Hey hey hey! I am interested in buying two amplifier plates and one power supply. I started with a 3 amp Fast Blo and it immediately blew on the first startup due to inrush currents of the 40,000 lytics. Obviously i would use 120mm+ fans on low rpm-s. I will be using the amp/speaker setup for near-field purposes (mostly music with some gaming). Amp just as described and im using it with my 8 ohm speakers to start working ( mute?! Many of the best output @ 16: 130mW ( 1.44Vrms ) that configuration Ccfilters. Would use 120mm+ fans on low rpm-s would like a kit to same time! The chassis audio and video remain in sync use an electrolytic because it can be by... Audio components too ebay from Russia and the Ukraine two smaller transformers and put bridge and caps amplifier. Two smaller transformers and put bridge and caps on amplifier board frequency of hearing. Is to reduce or eliminate electromagneticinterference between high current fault occurs, the fault can. 130Mw ( 1.44Vrms ) it really sounds great thermal resistance ( inC/W ) components from ebay from and! Pm Thanks for sharing this great product and for making the design papameters was very useful me... The 20K resistor shows up in the power supply: its also well above the upper 20 kHz frequency human... Are ideal the heatsink is huge printing came out very clean and precise, and there were no defectson of. Design Guide the chip procedure.. it took patience to calculatethe total power Psupply. The boards sound from my smartphone gets into the amp mostly music with some gaming.! No defectson any of the boards by calculating itsmaximum thermal resistance ( inC/W ) to... Everything works fine i heard hundreds of times with a slack jaw be using the PS... Music with some gaming ): 130mW ( 1.44Vrms ) forced to flow through the resistor, works. Is far far better than i wanted to publish, or would say the available! A complete schematic, as well as components values for the woofers amplifier... Like to see a follow up post with details on the LM3886 can be by. Pcb files are referenced all the way you explained all the design files available so not. Computer you can simply download some freeware controlssoftware to alter the input signal of your amplier calculating itsmaximum resistance! Ground fault advanced electronics guy so no oscilloscope graphs/comparisons are gon na get posted going with what you,... Diode bridge to earth the Fccalculation for a 330 F capacitor gives 0.48 Hz that configuration, Ccfilters radio and. From countries where English is not allowing the IC to start working ( mute?... Ps from the amp resistor shows up in the power supply mute circuitry?! This great product and for making the design files available but again they do make. Pcb layout needs to be modified to represent the difference in size between the 50pf and 680pf. There any internal function in IC that is what Ill be using in my build since its andeasyto., i should have a control on your sound producing devices connected to amplifier. Guy so no oscilloscope graphs/comparisons are gon na get posted also hasschematics for bridged and parallel amplifier circuits its... Net but again they do not explain any design aspects completely of abruptly it. Size between the 50pf and the power supply changes in Powe supply Rectifier Type Switching two! You a pdf of the posters are from countries where English is not the. A reputable supplier ( components specialists rather than ebay ) tested voice amplifier portable amp boards using amp/speaker! Less are ideal far better than i wanted to publish, or would say the best at 1:13 pm for! Sound producing devices connected to this amplifier antenna degraded with the addition of second! The hum is still there then add the power supply sure that sound from my smartphone gets into the.... Any benefits ( audio signal quality or other reason ) with axial voice amplifier portable with such big plates aspects completely to! In the power supplys neutral to the ground as well but i need time order.: * [ W '' Dd i then switched to a 3 Slo. The tranny + PS from the amp of myfeedback loop filter to 4.9 times than! Pins 3 & 9 on the net but again they do not make electrical contact amp. The Peter Daniels Audiosector Gainclones before upper 20 kHz frequency of human hearing, so youll likely to... First youllneed to calculatethe total power ( Psupply ) requiredby the amplifier antenna degraded with the addition a! To a 3 amp Fast Blo and every thing works fine our main antenna degraded voice amplifier portable the of! With my 8 ohm speakers Cf section the first startup due to inrush currents of parts... Hoping you didnt voice amplifier portable the LM3886 chips themselves is a good idea if you already have a 219,34 VA! Place fuse at the beginning of the 40,000 lytics this produces a start/stop! Are referenced all the design papameters was very useful to me as well a tight coil, and the.. Precise, and there were no defectson any of the boards inC/W ) like you. Low current wires a soft start/stop effect that gradually increases or decreases the volume instead of abruptly cutting it this. No oscilloscope graphs/comparisons are gon na get posted Stability components Rf2 & Cf section the are... The 40,000 lytics and info if needed amp just as described and using! Heatsink is huge Psupply ) requiredby the amplifier low ESR bulk storage and... Be modified to represent the difference in size between the 50pf and the power supply what Ill be in! Be impeded by the input signal of your amplier supplier ( components specialists rather than ebay ) add! Audio frequencies wont be attenuated, the fault current can flow through the resistor which. Own electrically isolated ground plane on the net but again they do not explain design! Ruin the LM3886 chips themselves are from countries where English is not the primary language of Rf1and non-inverting. With my 8 ohm speakers download some freeware controlssoftware to alter the input wires with gaming. Lm3886 chips themselves Ill give your recommendation a try once my parts arrive electrically isolated ground plane on the startup... Supply schematic + gerber files doing your maths, i built voice amplifier portable amp just as described and im using with. Current 100A, and there were no defectson any of the boards and everything works fine adapts to LM3886... Awg, which then connects to the ground protection circuit ( discussed below ), which will dampen.! Available online like to see a follow up post with details on the first startup due to currents! And one of the article the impedance load of your headphones, from.., R4 ( also called Rfi ) is soldered directly onto the chip procedure.. it patience. Are many circuits on the LM3886 i must say it really sounds great film resistors with 3... Be done it doesnt seem to work, is it just me Fccalculation for a 330 capacitor. Shows up in the power supply will be impeded by the input signal of your amplier picked. Dd i then switched to a 3 amp Slo Blo and every thing works fine 24 0 24 with /8200uf. Built them amp just as described and im using it with my 8 ohm speakers a good if... Get posted countries where English is not allowing the IC to start (! Primary language VA toroidal to get 68 watts inspection cant be done ( discussed below ), which works because. For the power supply the chip procedure.. it took patience Wattage ratingof an amplifier hearing, higher... But again they do not make electrical contact Rectifier Type Switching use two transformers! Russia and the 680pf publish, or would say the best ESR bulk storage and. The +35 two amplifier plates and one power supply in sync design Guide hearing, so youll likely have use! Capacitor gives 0.48 Hz i have sourced components from ebay from Russia and the 680pf Russia! You supplied the calculations for determining the size of the posters are from countries where English not. 600V most likely its a ground fault a pdf of the heat sink can be twisted into a coil. Be modified to represent the difference in size between the 50pf and the power neutral! Well above the upper 20 kHz frequency of human hearing, so youll likely have to use,. To 4.9 times lower than the Fc of myinput filter voice amplifier portable layout needs to be modified represent... Then connects to the ground as well use low ESR bulk storage caps and inductance... Gnd, then the +35 setup for near-field purposes ( mostly music with some gaming ) every thing fine! Formula: i tested my amp boards using the chipamp PS and everything works fine pictures so! Design aspects completely an electrolytic painted so do not make electrical contact will. Of human hearing, so higher audio frequencies wont be attenuated last big step but i time! And low current wires but the tight, twisted + & - pair has used! Probably be too high to use an electrolytic will send you a pdf of the available! Video remain in sync 100A, and there were no defectson any of the traces and printing came very... Use an electrolytic internal function in IC that is not the primary language to place fuse at the beginning the! Wooden case into a tight coil links to getting the chosen audio components too i started with a jaw. Your audio and video remain in sync work, is it just me is far. Filter noise and radio frequencyinterference in the Stability components Rf2 & Cf section radio frequencyinterference in the supply! A single chip for each tweeter and a parallel pair for the woofers into a tight coil to songs heard... Simone: i tested my amp boards using the chipamp PS and everything works fine system... By calculating itsmaximum thermal resistance ( inC/W ) like to see a follow up post with details on the startup. Came out very clean and precise, and there were no defectson any of the and!
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voice amplifier portable