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STD Origami: a collection of guitar effects.

License: CC-BY-NC-SA 3.0

Mode: Editors' pick

Cloned from Origami: a collection of guitar effects.

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Update time: 2021-06-25 18:00:11
Creation time: 2018-03-12 04:33:27
Description
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 be 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. Thanks.
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PCB
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ID Name Designator Footprint Quantity
1 TL081EE U2,U4,U5,U1,U3,U6,U7,U8,U10,U12,U9,U11 DIP08 12
2 {Rval} R11,R12,R13,R10,R14,R15 R3 6
3 SIN(0 2 1k 0 200 0) VSIG2,VSIG1 2P-5.0 2
4 SIN(0 0 100) VLFO 2P-5.0 1
5 100k R16,R17,R18,R3,R1,R8,R9,R10,R11,R12,R13,R27,R28 R3 13
6 1u C5,C4,C1,C2,C3 CP_8X13MM 5
7 4.5 ; PULSE(0 4.5 0 10u) V1,V2 2P-5.0 2
8 1N4148 D1,D2,D3,D4,D5,D8,D9,DFEEDBACK,D6,DFEEDBACK2,DFEEDBACK1,D7 DO35-7 12
9 220n C1,C4,C6 1206 3
10 10k R6,R7,R3,R5,R20,R21,R2,R8,R9,R10,R11,R12,R13,R14,R15,R16,R1 R3 17
11 5k R2 TRIM_POT_PTH 1
12 1Meg R9,R19,R20,R21,R2,R7,R15,R18,R25,R26 R3 10
13 1000p C2,C3 1206 2
14 10p C2 1206 1
15 1Meg RCLIP TRIM_POT_PTH 1
16 90k R7 R3 1
17 9 V1 2P-5.0 1
18 20k R4 R3 1
19 SIN(0.0 0.8 100) VLFO 2P-5.0 1
20 5k_LOG RV1 POT_BITECH-TTE_P160KN 1
21 1k R17,R3,R4,R5 R3 4
22 100k_LIN RV2 POT_BITECH-TTE_P160KN 1
23 51k R18,R19 R3 2
24 SIN(0.0 1.5 1k) V3 2P-5.0 1
25 4.5 V1,V2 2P-5.0 2
26 SINE(0 1.1 1k 0 100) V3 2P-5.0 1
27 CD4066B U4 DIP 1
28 compOC6pEE U9 DIP08 1
29 100k R19,R20,R21,R22,R23,R24 TRIM_POT_PTH 6
30 CD4013BCEE U2 DIP14 1
31 AND2EE U12 DIP 1
32 INVEE U13 DIP 1
33 QBC547B Q1 SOT23 1
34 QBC557B Q2 SOT23 1
35 NAND2EE U14 DIP 1

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