I.2. Reset and Booting

Reset Button. KEY1 is the on-board reset button, is especially useful in development, testing, or reparation service. In a final product the on-board reset button should be inaccessible inside the enclosure, so any reset action (if needed) should be done by power cycling (unplugging and re-plugging the DC power input). Silent Boot. H15 is a header connector for silent boot […]

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I.1. Schematic Diagram

The schematic diagram of the standard Blackstomp board is shown in the Figure 1. The circuit of the standard board is optimized (and compromised) between development and production usage. Bill of Materials ITEM COMPONENT REF QUANTITY 1 100k R2,R4 2 2 10k R1,R5,R6 3 3 330 R7,R13 2 4 1k R8,R11,R12,R3,R10 5 5 220 R14 1 6 47 R15,R16 2 […]

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ESP32 I2S-PDM Interface for Digital Guitar Pedal Application

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 […]

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Tutorial: ESP32 with ESP-IDF and C++ in Windows

Why ESP-IDF, C++, and Windows First of all, choosing the ESP-IDF frameworks is the best choice in terms of complete supports for all ESP32 peripherals’s functionality, because it’s the official framework released by the chip’s maker (Espressif). This choice is very important for long term projects, where “investing in time” is unavoidable to manage many things. Secondly, it might be […]

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

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 […]

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

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 […]

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

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 […]

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

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 […]

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DSKIT-P12BME1 Deepstomp DIY Programmable Guitar Effect Pedal Kit with Bluestomp ME-1 Multi-Effect Core

PRODUCT PACKAGE AND CONTENTS PRODUCT DESCRIPTION Deepstomp DIY Digital Guitar Pedal Kit with Bluestomp ME-1 Multi-Effect CPU module is a components kit containing complete unassembled parts to build a multi-effect stompbox/pedal featured with: Guitar chromatic tuner Integrated noise gate expander and compressor (with off-level and on-level controls for the noise gate, and with compression start level, compression amount/ratio, attack time, […]

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DSKIT-P12 Deepstomp DIY Programmable Guitar Effect Pedal Kit (without The CPU Module)

Description Deepstomp DIY Digital Guitar Pedal Kit without the CPU module. Kit Contents Pedal Enclosure Case Molded plastic material (2 mm thick) Size: 40 mm x 60 mm x 120 mm Vinyl label sticker Deepstomp Main Board PCB (DSPCB-12) Components Package Components Package Contents Resistors R1,R2,..,R42 ……. 42 x Resistors Switch, potentiometer, and knobs VR1,2 …… 2 x 10K Potentiometer […]

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HM936D-PCB Digital Soldering Station PCB

Description HM936D-PCB is a double-side printed circuit board for soldering station circuit that support power LED indicator, heater driver indicator, up-down push button switch interface, RTD/Thermocouple selection jumper or switch, and 3 digit seven segment display for displaying both set point and the actual temperature. Documents Hardware circuit schematic diagram and system design reference PCB manual (only in bahasa Indonesia)

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