Electronic Circuit Design

Build Your Own Superfast Polyphonic Octaver Pedal with DT-FOG Module

October 12, 2023 Hamuro Leave a comment

Introduction to DT-FOG Module Unlike other polyphonic octaver pedals those have significant latency, DT-FOG module produce octave and sub-octave with almost imperceptible latency. The DT-FOG module processes transient and non-transient signal components separately. This separation enable the transient processor to have superfast latency as low as 1/100 seconds (10 milliseconds), and the non-transient processor to have a good frequency resolution […]

Category: Electronic Circuit Design Tags: DSP, Guitar Effect, Guitar Pedal, Music Circuit, Signal Processing

DIY Guitar Vocoder Pedal Using BWE-VO3 Module and GBPM-2 PCB

June 4, 2022 Hamuro Leave a comment

WARNING! As of August 30th 2023, BWE-VO3 module is discontinued (obsolete), replaced by DT-VO4 vocoder module. Refer to the following documents to build DT-VO4 Vocoder: DT-VO4 Vocoder Module User Manual DT-VO4 Application Note (BUILDING GUITAR VOCODER PEDAL USING DT-VO4 MODULE AND BGPM-2 PCB) Introduction BWE-VO3 is a vocoder effect module designed for guitar effect pedal application, based on digital simulation […]

Category: Electronic Circuit Design Tags: Digital Circuit, Digital Filter, Guitar Effect, Guitar Pedal, Music Circuit, Signal Processing, Vocoder

ESP32 I2S-PDM Interface for Digital Guitar Pedal Application

March 12, 2020 Hamuro Leave a comment

The PDM (pulse-density modulation) has been widely used in the current technology of audio signal conversion (from analog to digital) because its simplicity while achieving high quality conversion. This technology is widely used in digital microphone, and it is basically a sigma delta modulator circuit which is used in many modern audio codec chip as well. It is an interesting […]

Category: Electronic Circuit Design Tags: ADC, ESP32, Guitar Effect, Guitar Pedal, I2S, Interfacing, Music Circuit, PDM

Types of AC/DC Power Supply Adapter Circuits and How to Use Them

September 24, 2019 Hamuro One comment

Power supply is one of the main element in every electronic circuit, and the right AD/DC adapter circuit should be chosen if we want our device to accept power line voltage as the main supply. There several types of AC/DC adapter circuits, transformer-less (non-isolated), step-down transformer, and switched-mode power supply adapter. The schematic diagram of the circuits and how to […]

Category: Electronic Circuit Design Tags: Power Supply

Full-Adder Circuit, The Schematic Diagram and How It Works

September 23, 2019 Hamuro

Introduction Full-adder circuit is one of the main element of arithmetic logic unit. It is the full-featured 1-bit (binary-digit) addition machine that can be assembled to construct a multi-bit adder machine. We can say it as a full-featured addition machine since it has “carry input” and a “carry-output”, in addition to the two 1-bit data inputs and one 1-bit data […]

Category: Electronic Circuit Design Tags: Digital Circuit

ESP32-A1S Guitar Multi-Effect Engine with Microphone and MIDI I/O

August 23, 2019 Hamuro 9 comments

Since the release of ESP32 by Espressif, many application-specific modules based on this chip are produced. For example, Ai-Thinker produce image processing module with artificial intelligence support for image recognition. In the audio processing area, one interesting product by Ai-Thinker is the ESP32-A1S module. Because of the integrated AC101 codec inside, this module enable very compact and low cost solution […]

Category: Electronic Circuit Design Tags: DSP, ESP32, Guitar Effect

DIY Reverb Pedal Circuit: Spring-Hall Reverb with PT2399 IC

May 18, 2019 Hamuro 34 comments

Introduction to Reverberation Before getting into the design of DIY reverb pedal circuit, lets see the concept of reverberation first. Real reverberation happens in a performance chamber when the walls and every object inside reflects the sound back and forth. As the sound bounces back and forth in three dimensional space, the reflections creates more and more complex pattern. The […]

Category: Electronic Circuit Design Tags: Audio Effect, Guitar Effect, Guitar Pedal, Music Circuit, Reverb, Signal Processing

DIY Multi-Effect Pedal Platform is Now Low-Cost!

November 8, 2018 Hamuro

DIY Multi-Effect Pedal and Today’s Advanced Electronics Digital DIY multi-effect pedal is an expensive things in the past, but the advance of today’s digital electronics brings new hopes for many things. Because now there are many choices for low cost and high performance DSP microcontrollers, now I think we can implement a DIY multi-effect pedal with much lower cost than […]

Category: Electronic Circuit Design Tags: Audio Effect, Guitar Effect, Microcontroller

Component Twisting: Wiring Trick for Omnidirectional Bending

October 24, 2018 Hamuro

The Need for Component Adjustment Have you ever bent some components to trim their position? But then you got your PCB‘s track and soldering pad broken? I’m sure many of you have ever done it, since there would be many reason to do. Some of them just do that for aligning to get better visual appearance. Or some others might […]

Category: Electronic Circuit Design Tags: PCB, Soldering

DIY Digital Effect Pedal Platform Review: The Top 9

October 14, 2018 Hamuro

9 DIY Digital Effect Pedal Platform List To start researching on DIY (do-it-yourself) digital effect pedal for the next project, let’s see the list first. Take a look at some popular platforms to compare their specifications and prices, here are some: UNO – Electrosmash’s pedalSHIELD UNO MEGA – Electrosmash’s pedalSHIELD MEGA DUE – Electrosmash’s pedalSHIELD DUE Electrosmash’s Pedal Pi Openmusiclabs’s […]

Category: Electronic Circuit Design Tags: Arduino, Audio Effect, DSP, Guitar Effect, Review

Multi-Channel Expansion Oversampling: 15Bit from 12Bit ADC

September 5, 2018 Hamuro

Introduction: Analog-to-Digital Conversion Oversampling Every analog-to-digital conversion is designed for specific resolution depending on the bit (binary digit) width of the conversion. For example, a 10 bit ADC with 5V reference would have 5V/1024 resolution or about 4.883 mV. The intrinsic error related to the resolution is the digital-quantization error of ±0.5 bit. In other words, it should produce only […]

Category: Electronic Circuit Design Tags: ADC, Data Acquisition, Microcontroller

16-bit Audio PWM by Dual 8-bit PWM with Auto Calibration

August 19, 2018 Hamuro

Introduction: PWM (Pulse-Width Modulation) for Digital Audio Conversion Pulse width modulation (PWM) technique has been widely used for converting digital audio stream into audio signal since it is very simple and easy to implement. Many low-cost micro controllers include dedicated PWM controllers as their standards, and many engineers use it for many purposes. In this article, we present the solution […]

Category: Electronic Circuit Design Tags: Audio, DAC, Hardware Interfacing, Microcontroller, PWM

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