View LM #3) BPA – W Bridged/Parallel AB Amp reference design. Specifications, support documents, and additional tools available at Digi-Key. Your load looks mostly resistive, not capacitive. I think most design include a large capacitor between the speaker and the driver to block DC. W-power-amplifier-with-bridge-parallel-configuration The project is based on six LM to produce a well designed audio.

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The PCB is designed in lm886 way that the center area is filled with ground. What is the gain I should design for? The thermal resistance of the TF version plus thermal paste is about 2. Consent to store personal information: Post as a brigde Name. In the rest everything is equal to the circuit. Im considering building the amp, but i have a question that i sadly havent found an asnwer to.

Also, is your circuit amplifying arbitrary waveforms, or is it a square wave you mentioned FETs? Khurrum on September 21, at 9: Thomas on May 29, at Chip amps sound mediocre Reply.

DIY BPA 6x LM W audio Amplifier

Audio input cables running from the source to the amplifier chassis l,3886 pick up interference. Most of the time the controls pcb will be mounted parallel towards the front of the amplifier.

This allows for a smaller heat sink for the required dissipation thus saving a considerable amount of space and cost. That can be found with this formula:.

Could you also consider doing a solid state discrete power amp with dual dc power bridye. I will add a comment to this post: Robert Reed on August 15, at 3: Every component really does make a noticeable difference choice is subjective for example; it seems people like the foil in oil because the oil allows movement which causes distortion in 2nd order harmonics, which people perceive as warm.


What have others brigde to resolve this? Brad on November 15, at 5: There are many circuits on the net but again they do not explain any design aspects completely. Mono blocks, rather than stereo, the volume control before the amps, not in the amps, using a passive or a buffered pre-amp is essential for quality The power supply is all important and IS a part of the signal path, it controls it Bearing in mind most is subjective, though differences between components of different materials do have a definite measurable difference brkdge.

You need to reduce that 22kohm. The video at the beginning of the post will give you an idea of what it sounds like. The main system ground is located as close as possible the reservoir capacitors on the power supply. A lot of effort obviously went into this. I would like to know if there is a way to buy the power supply PCB instead of making it from scratch. Dave on September 6, at Hi All, someone correct me if I am wrong, the photo showing the board shows the pf in place of the 50pf as is the board lay out.

Thank you for sharing this. I’m sure it will breeze kHz. Vince on February 7, at From then on, I have been trying to improve its performance by making modifications.

If a separate supply is provided for each channel with separate capacitors bank for each channel, or even possibly with two power transformershow should grounding be organized?

Robert Reed on August 15, at I have sourced components from ebay from Russia and the Ukraine. I used solid core 22 AWG, which works well because it can be twisted into a tight coil. If I am correct the pcb layout needs to be modified to represent the difference in size between the 50pf and the pf all the best Reply.

Maybe it helps other people with similar questions.


However If amp is run at near full load not likely heating effects of the transformer and bulk storage caps should be cooled as well.

Use low ESR bulk storage caps and minimize inductance lengths. Imho not adding controls is a good idea if you already have a control on your sound producing devices connected to this amplifier. Which voltage level gives this output?

Evan on June 2, at 3: A single chip for each tweeter and a parallel pair for the woofers. Fusing both AC line input and power rails are the best but more work and expense.

A Complete Guide to Design and Build a Hi-Fi LM3886 Amplifier

However I am almost a new graduate of Electrical Engineer and not sure if I can handle the processes. Thus, I was wondering if you could state the specifications of your amp, distortion and noise characteristics so it can be compared to other LM designs, so see if one needs to bgidge anything.

I started with 1.

The 1nf capacitor at each input terminal are connected from the positive ,m3886 to ground or or from the ground to chassis? Metal film resistors with a tolerance of 0.

Real part of impedance is minuscule, just the leads and solder mostly. I signed up for the partslist but I am not recieving any partslists, can someone upload the partslist, thank you. Power levels now relevant are of the order of Watts at resonance, the 50 Watt transducers were for a prototype where I finally used a pair of high-current op amps 3 Amp.

What is the rating for the fuse at the power switch? I have quite a bit of leftover CPU coolers and i have an idea to use those for building an amp based on