As I already write in that post, the Ruby Amp it's a small instrument amplifier based on the LM386 IC. An in-depth analysis of this small amplifier in the electrosmash.com page here: https://www.electrosmash.com/ruby-amp-analysis. Basically this amplifier is composed by an N-Channel JFET input buffer that adjust the impedance of the instrument pickup. The speaker driving job it's done by the LM386.
Many mods can be found online for this amplifier.
Developing this mini PCB board, I've decide to collect for models/mods:
- Standard model: as found in http://www.runoffgroove.com/ruby.html page
- Bassman mod: makes the ruby sounds like an old Fender Bassman amp
- Hiwatt mod: gives this amplifier a nice British sound like an Hiwatt amp
- Distorsion mod: adds a distorsion switch
The board itself is really small 3.2x4.3cm.
The power plug, input jacks, switch, and potentiometers needs to be connected using extension wires.
That's because I want this board to be adaptive to any box, even small one. Like salvaged hardware PC speakers.
You can find below the EagleCAD (https://en.wikipedia.org/wiki/EAGLE_(program)) schematics and board, as long as exported image.
On the schematic you will find instruction for the main mods available.
Schematics
Notes
- read risk disclaimer
- excuse my bad english
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