6 - Building the NoSo One Plus
barry (Administrator) 11-24-2015 at 07:05 AM.
Post: #1
The Plus version of the NoSo One takes the same basic circuit and adds some extra controls and options for more tonal variety and more distortion. If you bought the Plus version, the first thing to do is to build the Basic version as shown in the earlier pages of this build guide. When that's done, it's a simple job to convert it.
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barry (Administrator) 11-27-2015 at 01:43 AM.
Post: #2
Choose the amount of boost
The first change to make is to remove the one-wire boost modification described for the Basic kit on the previous page. Now plug the blue and purple wires that are attached to the pot (potentiometer) into the same holes.

Now, the knob position controls how much boost you have, from no-boost at fully counter-clockwise to full-boost at fully clockwise. Try it and confirm that it works. With a humbucker and mid-to-full boost, you have plenty of distortion.

   
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barry (Administrator) 11-27-2015 at 01:55 AM.
Post: #3
Controlling bass frequencies
You can also use the two-position switch and an extra capacitor to add a bass voicing switch. As standard the NoSo One passes a lot of bass frequencies to the speaker, but by adding a smaller capacitor and using a switch to bypass it, you can control this. (Later on, you can substitute other capacitors to fine-tune the response.)

The first step here is to move the yellow wire that comes from the speaker to the new position shown below. Add the small 47uF capacitor next to it, making sure that the capacitor's negative terminal is plugged into the row with the ground connection (black wire).

   

Now plug in the three wires from the switch. Note that the orange wire isn't connected to anything. This is intentional, it just stops the extra wire from flapping around.

   

Now try out the switch. You should find that it makes little difference to the volume of the top strings of your guitar, but a big difference for the bottom strings.
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barry (Administrator) 11-27-2015 at 02:05 AM.
Post: #4
Adding more boost
The overdrive tone created by the LM386 chip is surprisingly crunchy for such a simple-to-use device. But when you want more, a handful of extra parts lets you get even more overdrive. We'll add a JFET between the guitar input and the LM386.

First, make some room by moving the red battery lead to the top corner of the breadboard. Then move the white wire from the input socket, move it two rows along to the position shown here.

   

Now go to the component pack and find two resistors:
* 47k, with the colour bands yellow - purple - orange
* 1k, with the colour bands brown - black - red

Trim and add them to the breadboard in the positions shown below. Take care to make sure you place them in the correct rows.

   

Now add the J201 JFET. It's got three legs, and it fits just to the left of the LM386 chip. The legs are quite close together - closer than the breadboard's row spacing - so bend the two outer legs very slightly outwards. Make sure to orientate the J201 so that the flat side is facing towards the white input wire (shown by the red pointer in this diagram).

   
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barry (Administrator) 11-27-2015 at 02:26 AM.
Post: #5
The finished NoSo One Plus amplifier
With the JFET boosting stage added, the NoSo One Plus is complete. It should look like this (click HERE or on the image for the high resolution version):


   
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barry (Administrator) 11-28-2015 at 07:46 AM.
Post: #6
Test your NoSo One Plus
That's all there is to it! Plug in and try your amp; you should find that there's more distortion available. This is about as much overdrive as you can get from such a simple amplifier, but you can still dial it back a bit with the boost pot.

Here's a video clip of my prototype NoSo One Plus (plugged into a 2x12 cabinet as I haven't made a cabinet for the NoSo One yet!)





Enjoy! Smile
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barry (Administrator) 12-07-2015 at 05:00 AM.
Post: #7
**placeholder for NoSo One with its own cabinet**
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