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Summary of Contents for FuzzDog Big Muff Pi
- Page 1 MUFF Tone Stack Add some tonal delight to your favourite circuits Contents of this document are ©2018 Pedal Parts Ltd. No reproduction permitted without the express written permission of Pedal Parts Ltd. All rights reserved.
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Page 2: Important Notes
Important notes If you’re using any of our footswitch daughterboards, DOWNLOAD THE DAUGHTERBOARD DOCUMENT • Download and read the appropriate build document for the daughterboard as well as this one BEFORE you start. • DO NOT solder the supplied Current Limiting Resistor (CLR) to the main circuit board even if there is a place for it. - Page 3 Full Schematic + PCB The above schematic shows ALL the parts that are on the PCB. You can build several tone variations with this PCB, as shown in the next few pages. In each case Q1 can be replaced with your preferred BJT, such as 2N3904. C3 can be replaced with whichever value suits your circuit.
- Page 4 Standard BMP tone, no recovery Simple passive tone stack with scooped mids. This will drastically reduce your signal level, so only use in circuits where you will recover some gain afterwards. Add jumpers as shown below Empty Empty Empty Empty Empty Empty Empty...
- Page 5 Standard BMP tone + gain recovery Scooped mids tone with a gain recovery stage. The level of this is adjustable with the volume trimmer. The values below are for the LPB boost circuit which gives more output than the standard Muff values. Better to have more juice on tap and adjust with the volume than not enough...
- Page 6 AMZ Presence, no gain recovery AMZ FX (muzique.com) variation on the BMP tone with adjustable mids. Versions 1 and 2 give different responses, so check out the info at the link below to see what suits you best. This will drastically reduce your signal level, so only use in circuits where you will recover some gain afterwards.
- Page 7 AMZ Presence + gain recovery AMZ FX (muzique.com) variation on the BMP tone with adjustable mids. Versions 1 and 2 give different responses, so check out the info at the link below to see what suits you best. LPB recovery stage with adjustable level. No jumpers required 470K 100K...
- Page 8 Don’t want a volume trimmer? You can build a normal BMP recovery stage which is designed to approximately compensate for the signal level loss caused by the tone section. This eliminates the need for the volume trimmer. To do this on either of the versions with recovery section previously detailed, replace the parts below and add a jumper as shown.
- Page 9 Implementation There are no hard and fast rules about implementing this tone circuit. How it is incorporated into an existing circuit depends on what that circuit is. You’ll get different results from it being positioned in different places in a circuit. We’ll give some examples, but it’s really up to you.
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