Ruby guitar amp pdf

The speaker I used is very small 8ohm 0. You can def add a larger speaker though such as a 3w speaker if you wanted to. Playing it through headphones also improves the sound.

Introduction: Portable Ruby Guitar Amp. By lonesoulsurfer Follow. More by the author:. About: I've always liked pulling things apart - it's the putting back together again that I have some issues with! More About lonesoulsurfer ». I did a video of the build so check it below. Here we go. Parts: 1. MPF Transistor — eBay Small Tin - eBay Prototype Board - eBay Tools: 1. Soldering Iron 2. Drill 3. Pliers 4. Wire cutters 5. Hot glue. Try it out and make sure the circuit works before you move onto actually soldering onto a prototype board Steps: 1.

Solder the LM IC onto the prototype board 2. Next I like to make all of the easy connections first so connect pins 3 and 4 to ground 3. Connect the n cap to pin 7 and ground 4. Connect pin 6 to positive. Steps: 1. Solder the positive leg of the cap to pin 6 on the IC 2. Solder the ground leg from the cap to ground.

This will later be soldered onto the middle pin on the 10K pot 2. Both these will also be connected to the 10K pot later on 4. Connect the wire on the empty stop to one of the legs of the 47n Cap. Connect the right hand side leg of the transistor to the other leg of the 47n Cap 2.

Connect the left hand leg on the transistor to positive 5. Add a wire to pin 1 and also pin 8. This will be connected to the 1k gain pot later on 2. Solder a 10R resistor to pin 5 3. Next attach a uf cap to pin 5 positive leg of the cap and the other end on an empty spot on the prototype board 3. This will be connected to the positive solder point on the speaker 4. Add a couple of wires as shown to connect them 2. I tried to align these holes as best before I drilled 3.

Secure the pots into the holes. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website.

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Necessary Necessary. Necessary cookies are absolutely essential for the website to function properly. In RDV opinion, the based amps have a deficit of high-end frequencies, so this adjustment tries to boost the treble by placing a 15nF C 1 cap instead of the 47nF after the JFET buffer, limiting the low-end going into the circuit.

This changes also reduce the gain, so the Gain is set to maximum to compensate this side effect. Another 1nF cap C 6 across the volume control is also placed to fight treble loss. Hiwatt modification step by step:. The voltage gain is fixed in The graph shows from blue to red the responses from minimum to maximum volume respectively.

The gain is fixed to 46dB. The HP filter formed by the input caps C 1 and C 6 and the Volume pot R 3 produces the bass boost of the higher frequencies. The Bass Cut filter formed by C 5 and the load speaker effect is added to the previous filter reducing dramatically the gain below 90Hz. Unlike the Bassman mod, the tone of the Hiwatt mod is pretty different from original Ruby, the filters shape the signal boosting the high-end tones as RDV expected.

The extra gain contributes to get a different sound. Also, adding a. Finally, Ricky left pins 1 and 8 open for added headroom. Original Ruby vs Bassman vs Hiwatt tone comparison:. In this graph, the three amps frequency responses are represented together: The original Ruby and the Bassman mod have similar responses although the last one has slightly more bass.

The original Ruby gain is set to The Hiwatt curve has a clear boost in the treble harmonics compared to Ruby. The Ruby Amp can be modified to have an auxiliary headphones plug, in the same way that the Little Gem does. For more info, check the Little Gem modifications. Use a 1k, 2k, or 5k trimmer in place of the Gain pot. This will allow a pre-set for the amount of gain and distortion over the Volume pot travel.

A 9v power source is indicated on the schematic and layout, but Mark Hammer recommends using 8 AA batteries. The 12v supplied by the battery pack provides longer battery life and increased headroom.

Ruby Amp by Runoffgroove. Mark Hammer 12V Modification. Input Buffers Design by Jack Orman. Cascading Passive Filters by Ed Ramsden. Headphones Impedance Explained by NwvGuy. I appreciate the David Amann and Stefano Martini assistance in this article. Thanks for reading, all feedback is appreciated. Table of Contents 1. Schematic Diagram. The original super-simple Smokey Amp was reviewed by RunOffGroove who created the Little Gem, now once again the circuit gets reviewed adding new capabilities: The input buffer which keeps isolated the guitar and preserves the tone The N-Channel JFET input buffer will solve one of the main LM op-amp lacks: the low input impedance.

The new placement of the Gain potentiometer follows the LM recommendation and is a better solution than the previous Little Gem rheostat.