PoliWahnm

A Wireless Controlled Wah Pedal from PoliTeK.

---

Key Features • List of Components • How To Use • Credits • License

Key Features

• ... different modes of configuration (hat, feet, arm, guitar neck, hand).
• 9V Battery slot, automatically unplugged when using cable power.
• True Bypass to deflect the signal directly from input to output when the effect is disabled.

List of Components (To be Updated after Finished)

Resistors

Resistor	Characteristics	Link
$R1$	$50\ k\Omega$	Mouser
$R2$	$1.8\ M\Omega$	Mouser
$R3$	$2.2\ M\Omega$	Mouser
$R4$	$10\ k\Omega$	Mouser
$R5$	$68\ k\Omega$	Mouser
$R6$	$1.5\ k\Omega$	Mouser
$R7$	$22\ k\Omega$	Mouser
$R8$	$390\ \Omega$	Mouser
$R9$	$33\ k\Omega$	Mouser
$R10$	$470\ k\Omega$	Mouser
$R11$	$470\ k\Omega$	Mouser
$R12$	$82\ k\Omega$	Mouser
$R13$	$1\ k\Omega$	Mouser
$R14$	$10\ k\Omega$	Mouser
$R15$	$100\ k\Omega$	Mouser

Capacitors

Capacitor	Characteristics	Link
$C1$	$10 nF$ MLCC	Mouser
$C2$	$20 pF$ MLCC	Mouser
$C3$	$10 nF$ MLCC	Mouser
$C4$	$22 nF$ MLCC	Mouser
$C5$	$4.7\mu F$ tantalum	Mouser
$C6$	$10 nF$ MLCC	Mouser
$C7$	$22 nF$ MLCC	Mouser
$C8$	$220\mu F$ electrolytic	Mouser
$C9$	$100 nF$ MLCC	Mouser
$C10$	$100\mu F$ electrolytic	Mouser
$C11$	$100 nF$ MLCC	Mouser
$C12$	$100\mu F$ electrolytic	Mouser
$C13$	$100 nF$ MLCC	Mouser
$C14$	$10\mu F$ electrolytic	Mouser
$C15$	$10\mu F$ electrolytic	Mouser

Diodes

Diode	Characteristics	Part Number	Link
$D1$	Zener diode	BZX55C9V1-TAP	Mouser

Inductors

Inductor	Characteristics	Part Number	Link
$L1$	$500\ mH$	C36-X	Mouser

Microcontrollers

MCU	Characteristics	Part Number	Link
$U1$	Devkit Microcontroller	ESP32-C3-DevKitM-1	Mouser
$U2$	Devkit Microcontroller	ESP32-C3-DevKitM-1	Mouser

Transistors

Transistor	Part Number	Link
$Q1$	ZTX603	Mouser
$Q2$	MPSA18	Mouser
$Q3$	MPSA18	Mouser
$Q4$	TSM680P06CH X0G	Mouser

IC

IC	Part Number	Link
Digipot	MCP41100-E/P	Mouser
PS1	R-78E5.0-0.5	Mouser

Connectors and switches

Component	Link
Battery Snaps & Contacts	Mouser
$6.35\ mm$ Audio Jack	Mouser
$2.1\ mm$ DC Barrel Jack	Mouser
Footswitch	Mouser

How To Use

To simulate the behaviour of the PCB we designed, we used LTspice (download here).

LTspice Setup

In the SPICE analysis part you will find 4 different .asc files.

1. Wah_SS.asc

In this file you will find a Steady State analysis of the analog wah circuit. Looking through the AUDIO_OUT, the .param command changes the potentiometer value and gives the output analysis of the result.

2. Wah_FT.asc

In this file you will find a Fourier analysis of the analog wah circuit. Looking through the AUDIO_OUT, the .param command changes the potentiometer value and gives the output analysis of the result.

3. Wah_Audio.asc

In this file you will find a Steady State analysis of the analog wah circuit, however, you can analyse an actual audio file. To analyze your own audio file all you have to do is to add the audio file in the same folder so LTSpice can see it, and change the value of the signal generator accordingly.

5. Power Management Pedal.asc

In this file you will find a very simple simulation of how the different 9V and 5V power supply lines are generated inside the pedal to control both the analog and the digital circuitry.

ESP-NOW Protocol Setup

(To be Updated afterwards)

Usage of the Complementary Filter

(To be Updated afterwards)

Credits

For this project, we used the Un'analisi circuitale del Wah per chitarra (Crybaby GCB-95).

License

MIT

---

E-Mail • Instagram • Telegram Community

Compliation of the Libraries

TBA

TBA in more detail later.