10 Ten Little GainClones lots of solder

ben62670

Well here is one project I have been working on. I started about two hours ago. Lots of little solder joints. I need 2 more LM3886's:)

ben62670

Well Rat shack sucks. I need a couple 2 w 2.7r resistors, and of coarse they don't have them, or anything I can make them up with. I am going to scavenge some old XO's 2.5's will work fine.
Ben

jerryj12

Ok I just got to know. What is it?

ShinAce

An amplifier, or ten!

Gaara

Their gainclones. Gainclones are copies of the Gaincard amp, a really expensive amp that it turned out was mostly profit. Clones are very simple in design and have very few parts, with many people putting them in cheap enclosures. This allows you to have a very inexpensive amp, yet they sound absolutely amazing.

I personally use 2, one to power my LSi9s and one to power my surround speakers. The one on the 9s is one of the best amps I have ever used with those speakers and only cost $170.

Ben you doing this business or pleasure? LM3886 is supposed to be quite good for 4ohm loads, you might want to consider the higher powered variants like the BPAs. You could make a BPA300 with all of those or a few BPA100s.

ben62670

Its going to be business. Just like my cables I found something that is cheap, but like you mentioned marked way up. Like you stated these things are pretty simple, and all the stages are actually located on the chip so layout, and external components are kept to a minimum. These will be run parallel to handle low impedance speakers like G's with no problems.
Ben

ben62670

BTW this amp is going to be used on the highs of my custom SDA's. With the requirement of @50 watts each driver I am not fully decided whether or not to parallel the gain-clones, or running 4 channels so each gets its own amp. I will do either a single amp for each driver, or run them together. If I stay separate I could further add tweak ability with active XO components;)
Ben

Systems

ben62670 wrote: »

BTW this amp is going to be used on the highs of my custom SDA's.

They provide great bang for the buck and they should sound very good driving your tweets. They are also an excellent choice for building inexpensive multi amp active systems ,even Mr Linkwitz recommends them for use on his Orion and Pluto designs.

ben62670

They would make a great 5, or 7 channel, but I have just gone back to 2 ch. I watch movies with just my little kids so HT is far back burner.
Ben

ben62670

A) torid PS 34vdc rails
1 gainclone chip amp
C) 13,600uf in PS caps
I stole these parts from my Accurian. I actually took a 4 1/2 inch grinder with a cutoff wheel, and removed the PS section of the board. I shold have done this outside:D
Well here it is on my desk.

ben62670

I sine waved this sucker to 100w with minimal voltage drop with a 6.6 ohm load:D I have no idea what the distortion was, but it did not clip. Never went into protection. I held it there for about a minute. I expected it to get pissed at me, but it took it with no problems. I drove some monitor 4.6's to 116db with music. These dip to 4.6 ohms. I am using my PC to drive them, and its not the best source seeing it was playing mp3's. It definitely kicked the Accurian's but all over the place. I'll hook it up to the tweeters on my big SDA's and see how it sounds. BTW dead silent with no hum what so ever:)
Ben

ben62670

Well I have decided to parallel two amps per channel to give better power, and heat distribution. Also with the higher rails 2 chips sharing the same load run much cooler.
Ben

ben62670

Finally going to build my amp. I should see around 180wpc. I think I will use this for the tweets.

dudeinaroom

Damn it Ben. Just because I'm totally broke you don't have to read my mind, then do what I want to do. I wanted to build a 2ch with 4 LM3886s per ch. running each chip bridged, and in parallel with the others for more power, better current, and 2 ohm stability.