It is an enhanced version of the previous little gem amp also designed by runoffgroove.
Ruby amp vero layout.
The architecture of the little gem has been updated with an input buffer as found in the little gem mkii feeding the inverting input and the volume control changed from the output rheostat to the type and placement as shown in the datasheet application notes.
I feel it is a little expensive for the full version the demo version is software limited no saving or post editing etc but it was just what.
Also added a very small heat sink.
The data sheet for all 78xx v r s suggest using two fairly large caps for the in and out to ground.
I have just verified this.
The lm386 is a specialized op amp that was designed for easy creation of various audio amplifiers.
I don t think it s too fussy about what you use i ve seen people use the tiny 1 mylar speakers or hook them up to 4 x 12 marshall cabinets.
I was pleasantly surprised about how easy it was to use the software and i may well consider using it again in the future.
The 1 lm386 chip amp does all the amplification in the ruby amp.
I just built the noisy cricket based on the ruby amp and wired it straight into a strandard 8ohm 8 midrange speaker and it worked just fine.
Ruby is an enhanced version of the little gem battery powered amplifier.
It has been used in a lot of popular amps like the smokey amp the little gem the ruby amp the marshall ms 2 and the noisy cricket.
Simple dual led battery monitor stripboard layout.
The 1000uf caps i have a kinda big so the board ended up being 11x6.
The main power amplifier stage is based on the lm386 audio integrated amplifier.
Ruby amplifier stripboard layout.
Maybe overkill but i have made almost every 386 amplifier on the internet.
The lm386 chip amplifier.
The ruby amp is an lm386 based guitar amplifier.
As you can see in the schematic below there s a lot going on inside that eight pin dip chip.
Mains failure alarm stripboard layout june 3 may 2 april 10 march 3 february 5 january 3 2013 27 december 1 november 3 october 1.
It is a popular choice for low powered guitar amplifiers due to its low quiescent current and ability to run on 9v.
Although they are correct according to the schem.
It might be helpful to add a daughter board to the layout.
I used a demo version of lochmaster to layout a version of the lm386 ruby amp.
