Make your own bass fuzz (how to)

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john
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Make your own bass fuzz (how to)

Post by john » Tue Feb 10, 2009 12:33 am

So I was going to remake myself another bass fuzz and thought I would do a bit of a step by step photo thing,to show any of you that my be interested in making one, how easy it is. (got the Idea from DIY stompboxes .org s beginner project which is a clean boost)
You can get all the parts you need from jaycar

First off I will show you the schematics (layouts) I used. I have changed a few of the parts to suit my tastes or because I didn't have the part on hand so I just used the closest I had on hand.

The fuzz is called the bazz fuss designed by Christian H Image
mpsa13 is a good transistor for this one,
A pretty brutal sounding fuzz . But the problem is it only has an input gain. I want an output vol and tone as well....

Did a bit of searching for a tone circuit and found active ones are quite complex, but I found this cool passive circuit on the AMZ site by Jack Orman Image
now because it has a volume and so does the next circuit I will swap the 100 k pot for a 100k resistor

Quote from that page
A limitation of this combined tone control is that there is some signal loss, as with any passive network
I want this pedal to have even vol when bypassed on low gain so it needs a make up volume stage .
So I took the make up stage layout from the little big muff
Image

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john
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Re: Make your own bass fuzz (how to)

Post by john » Tue Feb 10, 2009 1:18 am

PART ONE; the fuzz section of the schematic
Image
From the left ;The squiggly line with the arrow going into it is a pot (potentiometer). A variable resistor. It will not be on the circuit board so we will ignore it for now .
In this pic is a cap, diode and sockets to put the transistor into
Image
I started with the (cap) capacitor (in the schematic it's the image with the two blocks with a plus beside it) it is an electrolytic cap you can tell by the plus sign , and it has to go in with the plus facing a certain way .
So put the cap in your PCB board like so. Note the Grey bit with the block on the cap ,that is the negative side of the cap .
Image
Then place the diode, which in the schematic is the other arrow image going into a block labeled 1n4148. The block part of it is the black band on the diode , it also has to go a certain way . Snip 3 of the sockets an place in PCB board
Image
Now the next pick is the other side (top pulled toward me)
Fold the wires over so the touch in the right places and snip ,just like in the schematic , and solder
Image

Then add the resistor and last cap (make sure it's round the right way , you will notice I did not snip one side of the resistor because that part will be connected to the 9 volts and so will other parts further on the board.
Image
Soldered
Image

And that's the fuzz section done

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john
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Re: Make your own bass fuzz (how to)

Post by john » Tue Feb 10, 2009 1:41 am

I like to test it now before I go on just in case I have made a mistake . Makes it a lot easier to find out what's wrong with it at the end if it's not working.
So I solder some wires to a couple of input jacks and temporarily solder them to the board
Image
Image
Notice the long wire along the bottom of the last pic, that is for the grounds(arrows facing down in schematic) there will be a few things connected to that wire . Solder the grounds of your jacks to the ground wire and the tip end of your input jack to the first cap (far left on bottom pic)
and the other jacks tip to the last cap you soldered in. You will also need to wire in a battery clip, wire the red wire to the resistor and the black wire to the ground
Put the transistor in the socket with the flat side facing the input cap (forgot to take a pic sorry).
Then you are ready to test it.
you could house it as is if you like it .

I Will post the the rest in the next few days.

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Re: Make your own bass fuzz (how to)

Post by mjwhit » Tue Feb 17, 2009 5:51 pm

Thats awesome, very helpful!!! Thanks for sharing :D

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Re: Make your own bass fuzz (how to)

Post by beagle » Tue Feb 17, 2009 7:12 pm

Yeah you've done really well John. Easy to follow even for dumb nuts like me :wink:
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Re: Make your own bass fuzz (how to)

Post by john » Tue Feb 17, 2009 10:31 pm

Thanks. I should put the rest of it up. Been a bit lazy :oops:

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Re: Make your own bass fuzz (how to)

Post by foal30 » Wed Feb 18, 2009 6:02 am

yes nice work John
very good resource
if anyone "Has a GO" can they put up sound clips and any mods please?

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Re: Make your own bass fuzz (how to)

Post by Jake » Wed Oct 13, 2010 8:08 pm

Now that's interesting...
I've been wanting a bass fuzz for a while now, There isnt one on my multi fx.
I had a go at building a distortion pedal once. Sounds pretty average with bass and completely useless to me since I have my ME-20b, but I'll definitely have a go at making one of these
Will keep progress posted
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Re: Make your own bass fuzz (how to)

Post by john » Thu Oct 14, 2010 3:45 pm

Ha. I never got around to posting the rest. But if you get as far as I went you should be able to figure the rest out.
I did make it, And the bottom end was not the best...Because of the input and output caps on the gain make up stage.is my guess I have made the fuzz and tone schematics in others and they are fine.
If I did this one again I would try 4.7uf caps instead. Should work, I think.

Here is how to true bypass with a LED.

Image

If you want some MPSA13 transistors I can send you some, got heaps

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Re: Make your own bass fuzz (how to)

Post by Jake » Thu Oct 14, 2010 4:37 pm

Thanks for the offer but I've already got a few.
heres the list of components and prices from jaycar if anyones interested
Components:
10k resistors ($0.06)
MPSA13 transistor($0.48)
1N4148 diode ($0.48)
RE-6066 10 uf capacitor ($0.31) x2
PS-0162 6.5mm socket ($2.50) x2
RP-7610 10k log potentiometer ($2.90)
with a total cost of: $9.54

Note: what i havent included there is:
Some perfboard (HP-9550, $5.50), I already have one of these
A box (I plan to scavenge or make one of these) but a suitable one for this project would probably be HB-6015 ($3.90), which i may use
A switch (DPDT model is SP-0764, $9.90) i'll add this at the end
And... of course... a knob for the pot, i plan to use a classic chicken head one (HK-7700, $1.90)

These are just the parts for the main fuzz unit, I'll make this first then, all things going well, I'll add the other bits.
Will post further progress soonish
Last edited by Jake on Tue Aug 02, 2011 12:18 pm, edited 1 time in total.
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Re: Make your own bass fuzz (how to)

Post by Jake » Thu Oct 14, 2010 5:19 pm

Also, i dont know how credible it is but my friend said he made a similar pedal and that he changed the tone completely by changing the diode. He said you could even use LEDs. Does anyone know if thats true? If it is, I'll have a go at modding this one when i've finished building it
"The trouble with you is that you have more money than sense. And you're broke"

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john
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Re: Make your own bass fuzz (how to)

Post by john » Thu Oct 14, 2010 6:09 pm

Yeah it does change the character, I have tried the odd diodes silicon and germanium as well as LEDs.
You could use the socket things instead of soldering in the diode, so you can have a play around.

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Re: Make your own bass fuzz (how to)

Post by Jake » Thu Oct 14, 2010 6:46 pm

Yeah I'll definitely give that a go. What would be interesting is being able to switch through a variety of diodes..... Might give that a go also
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Re: Make your own bass fuzz (how to)

Post by Jake » Fri Oct 15, 2010 3:10 pm

Ok... Bought all the components I need except it turns out jaycar in new plymouth doesn't stock mpsa13s. John, would you be able to post me a couple? I'd really appreciate it if you could. Send me a pm if you can and I'll give you my address. Thanks
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john
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Re: Make your own bass fuzz (how to)

Post by john » Fri Oct 15, 2010 3:34 pm

PM sent

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