Fuzz Factory – OSH Park

Just soldered the first of three Fuzz Factory PCBs from OSH Park. Fired up on the first try. The board didn’t come with documentation, I had reverse engineer the board against the schematic to verify part numbers. Here is the schematic I used:

fuzz-factory

I used some AC128 transistors for Q2 and 3. The random choices from the lot sounded alright. I built this first board with sockets for the transistors for testing. I can test transistors on this board, if they sound good I can solder them into the other boards.

I like this board, the layout has pads for 16mm or 9mm pots. The width fits the narrow dimension of a 1590B box, which gives you the option to arrange the box in landscape like the original, or in portrait, like most standard stomp boxes. The Stab and Volume pots are mounted off board. While this adds some wiring, it saves cost by making the board smaller, OSH Park charges by the square inch, it also provides flexibility in how the box can be arranged. Hats off to the designer. Hats off to mr vex also.
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Osh Park PCBs

IMG_1158.JPGI just received this order from OSH Park. I order four boards. You are required to buy three copies of each board you order. The cost is $5 per square inch for 2 layer boards (with 3 copies of your board included in that price). Which is not bad, if the boards are small it’s a deal. For example, the SHO was $3.20 for three boards! The Fuzz Factory boards, were $7.75 for three, still a good deal. The Haunting Mids boards were just under $5 each, and the Zeke Bass Distortion was about $8.50 each.

Of course getting boards for designs that people upload with little info can be chancey. There should be more options on the site to comment, and mark boards as verified. Looks like not all projects are shared. User decide to share a project. Hopefully people make an order and test it before sharing.

The quality of the boards is great. A couple things I noticed. There is no solder mask. The pads are gold plated, which is nice. I find the solder mask easier to solder with. Look at the first image. You can see the backside of each of the four boards. Notice the board in the upper right. The pads are fairly small. I think, this is the default pad size in Eagle PCB. It’s not easy to solder, It’s not super difficult either. The two on the left have a more generous pad size. This size makes for a better soldering experience.

I’ll post again when build these boards…

For reference here are some links to the boards I ordered here:

https://oshpark.com/shared_projects/JtR27cHU

https://oshpark.com/shared_projects/xaBILSTV

https://oshpark.com/shared_projects/KE0blXBg

https://oshpark.com/shared_projects/nsJTeQK0

 

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Resources to get started making stompboxes

Getting Started

Someone asked me about getting started building stompboxes, so I thought I’d put it all in a forum post, for your enjoyment and edification.

Become a member of both of these forums. Search, and read what’s posted there. Post your work, and your questions. Lot’s nice knowledgable people.

Probably the oldest stompbox forum around. Really friendly and helpful people. Lots of good info.

http://www.diystompboxes.com/smfforum/

Another great forum, this one has been around for a while.

http://freestompboxes.org/

This forum, ostensibly, caters to the subject Madbean PCB projects, but the people here talk about everything. Not much traffic as the other two forums.

http://www.madbeanpedals.com/forum/

Kits

Probably the best kits out there. This would be a good place to start.

www.byocelectronics.com

Parts

While you were able to get enough parts to make a couple stompbox projects at RadioShack in the past, these you can’t really get more than a cell phone’s there. Sadly there are no brick and mortar stores that cell stompbox parts. Then again you can

Mouser All purpose electronics supply.

SmallBear The original stompbox supply

Mammoth They have everything, good quality, order boxes in colors, and pre-drilled

Pedal Parts Good prices for boxes

Tayda Cheap, good range of parts.

Futurlec Good prices, slow shipping.

Bitches Love My Switches (Yes, that really the name) great prices, prompt shipping. Good for switches, knobs, and jacks.

PCB

After building a few kits try building from just the PCB. You’ll have to source your own parts.

http://www.madbeanpedals.com/projects/index.html

These are very well done PCBs. I have built the the delays.

http://1776effects.com/

http://www.guitarpcb.com/

Here are a few more sources for PCBs, I haven’t tried these

http://lectric-fx.com/

http://diyeffects.com/products.htm

After you make a few projects you might want to try making your own PCB.

http://dirtypcbs.com/

This site is something special. It allows people to upload their PCB designs, and open sources them to the greater community. The prices look good.

https://www.oshpark.com/

Experimenting and making your designs

Get yourself some parts and a breadboard. Build a test rig, and an audio probe, and you’re in business. Besides the forums above, these sites have some information and projects to try.

http://www.runoffgroove.com/articles.html

Download the Stomboxology Article: Going Discreet. This is a great primer on transistors.

http://www.moosapotamus.net/

Sort of the grand daddy of stompbox info

http://www.geofex.com/

 


OSH PARK

This is a really cool service that manufactures open source PCB designs. You can order any of the open source designs on the site. Most of the stuff is not stompbox oriented. It takes a little google-fu to search up stompbox projects. You can also upload your own designs.

You have to order 3 PCB minimum for each board you order. The orders seem to get ganged with other orders so it sounds like your order doesn’t get printed immediately. That said the prices seem very reasonable.

https://www.oshpark.com/

I just placed an order for a few PCBs. I’ll post again when the order comes in…


Good Articles on CMOS Chips in Stompboxes

Here are some good articles on using CMOS chips in stompboxes.

http://www.parasitstudio.se/building-blog/cmos-workshop-part-1

http://www.parasitstudio.se/building-blog/cmos-workshop-part-2-square-wave-fuzz

http://www.parasitstudio.se/building-blog/cmos-workshop-part-3-octave-down

 


Null-A (dual orange squeezer)

Two Dan Armstrong Orange Squeezers, in series. This was built following the dual orange squeezer build at uStomp.com.

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Madbean Moodring

sort of a heavy duty reverb.
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Analog delay

this is a a clone of the Boss DM-2. I used the Coolaudio V3205. The delay time is fairly short, less than one second. The delay sound is very nice, I can see why people covet these bucket brigade delays.

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Titan Boost-Octave

I built this some years ago, and lost the ages on my blog so I thought I’d repost them. This was a idea posted by John Hollis, whatever happened to him?

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Royal Jelly Buzz #2

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SG Jr kit

this was built from précis ion guitars kit. I made a few small modifications.

The finish is a wipe on wax from wudtone. This looks really good and was very easy to apply, required no special equipment, and, best of all, no toxic fumes! You could apply this stuff in your living room, seriously. It was very easy to do. The cost was not cheap, though not bad for a single guitar.

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Old builds

A few more olds builds.

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