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.

Ruby amp vero layout. The main improvements of the ruby amp vs the little gem are new the input buffer a renovated volume control and an updated gain potentiometer. It is a popular choice for low powered guitar amplifiers due to its low quiescent current and ability to run on 9v. 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. Although they are correct according to the schem.

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. It is an enhanced version of the previous little gem amp also designed by runoffgroove. As you can see in the schematic below there s a lot going on inside that eight pin dip chip. The lm386 chip amplifier.

The 1000uf caps i have a kinda big so the board ended up being 11x6. The ruby amp is an lm386 based guitar amplifier. 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. Also added a very small heat sink.

The 1 lm386 chip amp does all the amplification in the ruby amp. Verified ish the gain wires need to be switched around. The data sheet for all 78xx v r s suggest using two fairly large caps for the in and out to ground. I was pleasantly surprised about how easy it was to use the software and i may well consider using it again in the future.

Maybe overkill but i have made almost every 386 amplifier on the internet. The lm386 is a specialized op amp that was designed for easy creation of various audio amplifiers. So it s good to go. The main power amplifier stage is based on the lm386 audio integrated amplifier.

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. I have just verified this. Ruby is an enhanced version of the little gem battery powered amplifier. Ruby amplifier stripboard layout.

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