Deepstomp: Low-Cost High-Performance DIY Multi-Effects Pedal/Stompbox Platform

Introduction The advance of today’s digital electronics bring a new hopes for many things, because now there are many choices for low cost and high performance DSP microcontrollers. For example, a small board, popularly called “blue-pill”, is advertised in an online store for only US$ 2.25 (Figure 1.-upper part). It has 72MHz 32-bit processor core with some DSP instruction sets […]

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Component Twisting: A Simple Wiring/Assembly Trick to Enable Omnidirectional Bending 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, and some others might do it for more serious […]

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10 DIY Digital Stompbox / Effect Pedal Platforms Review

To start researching on DIY (do-it-yourself) digital  stomp box / effect pedal for the next project, let’s take a look at some popular platforms to compare their specifications and prices.  Here some of them in my list: Electrosmash’s pedalSHIELD UNO Electrosmash’s pedalSHIELD MEGA Electrosmash’s pedalSHIELD DUE Electrosmash’s Pedal Pi Openmusiclabs’s Stomp Shield Hoxton OWL Teensy Axoloti SlackDSP Sparkfun’s Proto Pedal […]

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Getting 15-Bit Resolution by Multi-Channel Expansion Oversampling of 12-Bit ADC

Introduction: Increasing The Resolution of Analog-to-Digital Conversion by 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 (or 2.441 […]

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High Precision 16-bit Audio Output Using Dual 8-bit PWM with Auto Calibration

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 microcontroller, the PWM controller is implemented […]

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Arduino HM-936D Soldering Station Controller Development

A. Introduction: The 936 Soldering Station Series in The Market With the popularity of specific brand’s soldering station labeled with 936-series, many manufacturers (mostly Chinese companies) make benefits by producing the counterfeit products with the generic names “936 series” soldering station. It is a good things that their parts are widely available on the online marketplace, as shown in the […]

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Adjustable Frequency Flip-Flop Circuit Using Inverter Gate

This flip-flop circuit uses one potentiometer and one capacitor as the frequency determining components. The assembled circuit is shown in the Figure 1, and the schematic diagram of the circuit is shown in the Figure 2. The circuit consists of one integrated circuit of inverter gates (4069 CMOS or  74C04), one electrolytic capacitor, two resistors, two LEDs, and one potentiometer. […]

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Converting 5V 7805 Linear Voltage Regulator to Produce 6.4V Output

Making a linear voltage regulator using 78XX integrated circuit series is very easy, it needs only one or two additional components to make the integrated circuit chip works. The problem arises when we need a custom voltage specs for the output, since they come in discrete fixed voltage variation (specified by XX parameter printed in the body of the IC […]

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High Voltage (220VAC) Bass-Treble Automatic Disco Light Controller

The previous music-controlled disco light controllers, the audio-controlled disco light controller circuit and hi-lo (treble-bass) disco light controller have some features and drawbacks. The first one features high voltage drive, enable the circuit to drive 220VAC lamps, and the drawback is that it has only one way (single channel control). In the other side, the second version has two-way (bass […]

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Low Power Consumption Indicator with Blinking LED

Low Power Requirement of Indication and The Solution Visual indication using light emitting diode becomes very common, because LED technology offer many benefits: low power consumption, durable, and cheap. Some indication must be able to draw strong attention, or at least it must be very clear to read whether its state is on of off. In some application, the requirement […]

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Automatic Wah/Quack Effect Circuit with Attack and Decay Control

To get various characteristic of an auto wah/quack effect, we need a flexible control of  the envelope detection characteristic. Some playing styles need slow attack but fast decay,  but some others don’t. Employing the detector circuit presented in our previous article Envelope Detector Circuit with Separate Attack/Rise and Decay/Release Time Settings, here we present the improvement of the previous auto […]

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Envelope Detector Circuit with Separate Attack/Rise and Decay/Release Time Settings

Introduction to Envelope Detector Circuit Envelope detector circuit is used to get the amplitude profile of a signal. Some important properties of an envelope detector are attack or rise time and decay or release time. In the Figure 1, a signal is plotted in blue, and the detected envelope is plotted in black. Since it employs capacitor for filtering inside […]

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