Free Electronic Circuit Design
To capture your guitar chord or notes and freeze it infinitely, you’ll probably need a freeze pedal (like EHX’s freeze pedal for example) that capture the snapshot of the audio spectrum to resynthesize the continuous audio waveform representing the captured sound. Fortunately, now you can build yourself a freezer pedal that has all that functions using a small DT-AFRZ module. […]
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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 […]
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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 […]
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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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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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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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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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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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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 […]
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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 […]
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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 […]
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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 […]
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