Haunting Mids is a Big Muff variant. In a nutshell it’s the input buffer, and first two clipping stages from the regular Big Muff circuit. It drops the tone control and the output buffer of the original circuit. There are a few other changes in part values but the the circuit is otherwise the same.
Haunting Mids Fuzz is not to be confused with JHS pedals Haunting Mids which is a completely different circuit that came later.
I created this PCB layout from version 3 of the original Haunting Mids. I made small change by moving the sustain/gain control to the outside of the box. The original circuit used an internal trim pot with only the volume accessible from the outside.
The PCB was designed in Eagle PCB. You can order boards from OSH Park for fairly cheap but you must order three. You can order boards here:
this should be a pretty easy build. Without the tone control and output buffer there are fewer parts than the original Big Muff. Pots and LED are mounted to the board. And most of the off board connections are lined up along the bottom of the board for easy wiring.
The parts are standard and easy to find. You should be able to order all of the parts at Tayda.
LED Red 3MM
LED Red 3MM
The circuit shows BC337 transistors but these don’t seem to be so special. You should be able to replace these with just about any NPN device. The usual suspects 2N3904 and 2N5088, or maybe 2N5089 if you want more gain.
The diodes are the same. You can probably experiment with anything for diodes in this circuit. The choices here are interesting definitely try them. But if don’t have these parts or can’t get them use what you have!
This Haunting Mids clone is on sale on my Reverb shop. If you haven’t heard of Haunting Mids, this is not a clone of the JHS Pedal with the same name, it’s DIY community variant of the Big Muff. It has a great sound and stands on it’s own in the field of BMP clones.
The Haunting Mids Fuzz uses the first three transistor stages of the original circuit but drops the tone stack and output buffer. It also changes up the regular diodes for some more carefully chosen diodes in the clipping stages. What you hear is the raw distortion from the circuit without any filtering.
The original circuit uses a single volume control with an internal trimmer where the Sustain control would go. This was meant to be set and forget. I’ve moved this to outside of the box to give you a little more control and variety of sounds.
I 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: