For You Lot Data Edifice A Noisy Cricket Mk 2 Amp Together With Mini Speaker Cabinet

I quite similar the hold back of the Noisy Cricket Mk II amp from Beavis Audio (http://www.beavisaudio.com/projects/NoisyCricket/), in addition to I happened to convey a wooden box lying around that looked similar it would operate peachy every bit a 6” speaker cabinet, therefore today’s project. (EDIT: Actually it turns out the Mk I in addition to the MK II are the same. The solely departure is the PCB design, in addition to since I'm using veroboard, that's irrelevant.)

The Noisy Cricket is a picayune 1/2 Watt guitar amplifier that fits into a measure Hammond-like enclosure (such every bit the 1 I used here: /search?q=building-modified-ea-tremolo-pedal-on). It uses a MPF102 or a 2N5951 transistor every bit a preamp channel in addition to an LM386 every bit the ability amp. It’s also powered from a measure 9v guitar pedal ability provide (or fifty-fifty a battery). What’s non to like?

As I commonly do, I’m going to role Veroboard for this. Influenza A virus subtype H5N1 few people convey already done layouts for it, in addition to I decided to become amongst this one:

Which tin live constitute here: /search?q=building-modified-ea-tremolo-pedal-on

In improver to the Veroboard layout, this 1 has an additional musical note switch, which lets yous select betwixt the master copy 47nF musical note capacitor, or the “improved bass” 100nF capacitor. In the end, I didn’t role a switch, electing instead to elbow grease both caps in addition to select whichever 1 I sentiment sounded best (in my instance the 100nF).

Anyway, let’s larn started. First nosotros cutting the veroboard to size:

You tin meet inwards a higher house that I convey drilled a hole inwards the bottom correct corner to stand upwards for the 1 inwards the compass left. That’s because I’m going to secure it within the box (more on that later).

Now I cutting the tracks inwards the appropriate locations:

And so give the copper a create clean amongst a wire brush. This is to take away whatever tarnish from the copper, making it easier to solder.

Meanwhile, I’m also working on the box. First I operate out where all of the controls/jacks volition go:

Then I drill them out using a stepping drill bit:

After that I produce a quick layout banking concern check to brand certain everything is going to fit similar I’d hoped:

I also gum inwards a duo of clips to concur the board inwards house 1 time it’s done.

OK, let’s larn soldering:

Here are all of the components inwards house (except for the chip itself, which I'll produce every bit a lastly step):

Then the wires:

And so finally wired upwards to the pots, switches in addition to jacks:

EDIT: I'm adding some extra information below nigh wiring upwards the box, since a duo of commenters so far convey asked if I could portion to a greater extent than details.

First, let’s hold back at the ability switch. You demand to connect the positive wire coming from your DC-in jack to 1 leg of the ability switch (let’s become amongst the middle pin). The bottom leg of the switch connects to the 9V wire on the board. Make certain the negative pivot of the DC-in jack connects to “ground”.

Here's a close-up of the ability switch:

Actually, a dot nigh “ground”. What I commonly goal upwards doing is choosing a fairly venture acre of metallic to connect all the grounds to. In this case, I used 1 of the reason tabs on 1 of the ¼” jacks (doesn’t affair which jack since they’re connected electrically through the metallic enclosure [this approach won’t operate if it’s non inwards a metallic enclosure, but but hooking upwards the other 1/4" jack's reason to this same dot likewise volition locomote along yous right]).

You tin meet that at that spot are a few reason wires all connecting the right-hand jack inwards the paradigm below.
 

The wire labeled “LED+” goes to the long leg of the ability LED (the other leg should so also live connected to ground.

“Grit 1” in addition to “Grit 2” connect to the middle leg in addition to bottom leg of the grit switch (doesn’t affair which means around). If yous purchase a DPDT switch (six legs), so yous tin role the other column of pins to give ability to an LED that volition betoken when the grit switch is turned on. To produce so, connect the middle leg inwards the other column of that switch to ground. Connect the goal leg of the switch inwards that column to a 1k resistor in addition to connect the other goal of the resistor to the curt leg of the grit LED. Finally connect the long leg of the LED to 9V ON THE BOARD (not at nowadays to the DC-in jack).

Here's how my switch looks:

OK, that’s the switches in addition to LEDs. Now let's hold back at the pots.

I’ve attached a photograph that form of shows the pot wiring. Basically every bit yous hold back at that picture, the pivot on the correct of each pot is pivot one, middle is pivot two, in addition to the left 1 is pivot 3. Same for all 3 pots. If yous mix upwards pins 1 in addition to three, it’ll however work, but everything volition operate inwards contrary (turning upwards volition truly cut back the volume, for example).
 

So, for example, “Vol 3” refers to pivot 3 on the book pot.


Some to a greater extent than points:

• Gain pins 1 in addition to 2 are connected together. You can’t truly meet it inwards the photo, unfortunately.
• Tone pins 2 in addition to 3 are connected together too.
• “Output” goes to the tip pivot of the output/speaker jack (the other pivot goes to reason of course). 
• Many speakers volition live marked + in addition to -. Theoretically, “-“ should become to ground, but it doesn’t truly affair that much.

Here’s how it looks all unopen up:

Now yell upwards I mentioned that box? Well hither it is beside a lovely 6” speaker I picked up:

We’ll demand to cutting a big circular hole, so let’s brand certain nosotros larn the centre inwards the correct place:

Then nosotros mensurate the diameter of the speaker:

I’m using this adjustable spinning blade of croak to cutting the hole. Believe me when I say yous that this special tool deserves all of your abide by in addition to so some. It volition happily take away some of your torso parts if yous are non careful.

But for all of its scariness, it does produce a peachy job:

A few to a greater extent than minor holes for the securing screws in addition to here’s the speaker attached (I'll add together a grill to this later):

Now nosotros demand to wire upwards a jack. Unfortunately the thickness of the forest is to a greater extent than than the length of the thread on the jack, so I’m having to larn a picayune creative amongst the solution.

I role some other like shooting fish in a barrel flake to scribe a describe a few mm downward into the wood. This volition human activeness every bit a direct for the adjacent step, both for the depth in addition to the outer diameter.

I so role a flat-bottomed drill flake (really, it’s a routing bit) in addition to really carefully lower the depth of the forest within the confines of the outer circle I’ve exactly cut:

I also cutting a picayune lip inwards at that spot to stand upwards for the lip that’s on the jack itself:

Here’s the jack inwards place:

I wanted to brand some form of handle, but also role the handgrip to concur the amp inwards place. However, I’d similar to live able to take away the amp at whatever phase to role amongst a unlike speaker, or fifty-fifty role a unlike amp amongst THIS speaker.

So I attached a slice of leather similar so:

Now the jack gets wired upwards to the speaker:

And I used a duo of metallic fasteners to concur the dorsum embrace on:

After a flake of a search, I constitute a suitably-sized grill to protect the speaker:

And hither it is belongings the Noisy Cricket inwards place:

Finally hither is a quick, muddy in addition to extremely amateur demo of the amp. I likely should convey planned what I was going to play earlier I started the photographic television set camera rolling, but hopefully it volition at the really to the lowest degree give yous an sentiment what the amp sounds like.