Origami: a collection of guitar effects.

5 years ago 1906
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A collection of analogue effects processing circuits.

These are simulations and not complete designs but will take relatively little work to turn into finished designs that can be transferred to PCB.

More work is required on things like the input buffering, pre-amplification and gain or tone controls, output buffering and mixer stages and power supply (the simulations are all based on a split +/-4.5V supply but in practice a single 9V with 4.5V MIDVCC supply rail generation may be more practical).

The three basic stages could be made into self contained rack mounting modules or pedals or they could all be combined into some kind of out-of-control Origasmic Wave Folding Machine of Doom that folds the whole of all possible spaces into a single eternal power chord of ultimate destiny.

Or not.

The three basic effects are:

  1. Clipping and Full wave rectification (similar to that used in the EasyEDA Tesseract Guitar Practice Amplifier)

  2. Peak Folding which folds the positive and negative peaks of a waveform about a dynamic folding level. There are two stages of this so the second stage folds the peaks of the already folded output of the first stage. There are two versions of this effect having slightly different circuits to track the peak amplitude. The folding stages of this effect have been christened Origamplifiers. Because I like the name.

  3. Octave Down stages to generate sub-octave harmonic content by dividing down a clipped form of the input signal and then using the outputs of the divider to synchronously chop and/or rectify the input signal. Again, there are two stages the second further processing the output of the first. This design shows part of a simple mixing scheme to give flexible control of the overall output but in pratice a simpler mixer and some sort of a patch panel may be a better solution as the number of pots gets out of hand, especially if stereo mixing, possibly with some additional tone controls, is desired.

All the effects will work with a guitar input but may work best with monophonic sources such as mono synthesisers, mic'ed up wind instruments and voice.

Please respect the CC-BY-NC-SA 3.0 license.



Clipping and full wave rectifier stages.

Peak folding stages

Peak folding stages 02

Octave down stages


ID Name Designator Footprint Quantity Mounted
1 TL081EE U1,U2,U3,U4,U5,U6,U7,U8,U10,U12,U9,U15,U11 DIP08 13 Yes
2 10k R2,R5,R6,R8,R9,R10,R11,R12,R13,R14,R15,R16,R7,R3,R20,R21,R1 R3 17 Yes
3 10p C2 1206 1 Yes
5 100k R3,R1,R16,R17,R18,R30,R32,R33,R34,R8,R9,R10,R11,R12,R13,R27,R28 R3 17 Yes
6 1Meg R7,R20,R21,R9,R19,R2,R15,R18,R25,R26 R3 10 Yes
7 1N4148 D2,D1,D3,D4,D5,D6,D12,D13,D8,D9,DFEEDBACK,DFEEDBACK2,DFEEDBACK1,D7 DO35-7 14 Yes
8 9 V1 2P-5.0 1 Yes
9 20k R4 R3 1 Yes
10 1u C4,C5,C7,C1,C2,C3 CP_8X13MM 6 Yes
11 SIN(0.0 0.8 100) VLFO 2P-5.0 1 Yes
13 1k R17,R3,R4,R5 R3 4 Yes
14 100k_LIN RV2 POT_BITECH-TTE_P160KN 1 Yes
15 51k R18,R19 R3 2 Yes
16 SIN(0.0 1.5 1k) V3 2P-5.0 1 Yes
17 {Rval} R11,R12,R13,R10,R14,R15 R3 6 Yes
18 SIN(0 2 1k 0 200 0) VSIG2,VSIG1 2P-5.0 2 Yes
19 SIN(0 0 100) VLFO 2P-5.0 1 Yes
20 4.5 ; PULSE(0 4.5 0 10u) V1,V2 2P-5.0 2 Yes
21 220n C1,C4,C6 1206 3 Yes
22 50k R2,R29,R35 TRIM_POT_PTH 3 Yes
23 1000p C2,C3 1206 2 Yes
24 5k R2 TRIM_POT_PTH 1 Yes
25 4.5 V1,V2 2P-5.0 2 Yes
26 SINE(0 1.1 1k 0 100) V3 2P-5.0 1 Yes
27 CD4066B U4 DIP 1 Yes
28 compOC6pEE U9 DIP08 1 Yes
29 100k R19,R20,R21,R22,R23,R24 TRIM_POT_PTH 6 Yes
30 CD4013BCEE U2 DIP14 1 Yes
31 AND2EE U12 DIP 1 Yes
32 INVEE U13 DIP 1 Yes
33 QBC547B Q1 SOT23 1 Yes
34 QBC557B Q2 SOT23 1 Yes
35 NAND2EE U14 DIP 1 Yes




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