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  • R-2R ladder D/A converter with mutilple non-zero inputs

    R-2R ladder D/A converter with mutilple non-zero inputsDecember 29

    PROBLEM: So I am not used to r-2r ladders where 3 out of 4 inputs are 0V. Here both A and B are 5V, so I don't know how to approach this problem. This is what i get when i simplify the ladder: I think there is a virtual short at the terminal between

  • Signal generator: PWM or R2R?September 3

    I want to build a signal generator using a ATmega 328P on an Arduino. Which way would be better. Using one of the timers (8bit or 16bit) built in to generate a PWM and then low-pass filter it, or using a R2R ladder system? I care more about harmonics

  • Converting Pulses to Analog Input for Mic

    Converting Pulses to Analog Input for MicMay 11

    A continuation of this question. I am attempting to read two flow meters through the mic port of a phone/tablet. The flow meters' pulse pins toggle between +0V and +5V as their pinwheels rotate. I use an R-2R to combine the pulses from the flow meter

  • Counteracting Sound Card AC Coupling for Reading Digital Data

    Counteracting Sound Card AC Coupling for Reading Digital DataMay 6

    Disclaimer: I am new to EE. Everything I have learned so far I have taught myself from reading online and posting questions like this while working on this project. I apologize if I do a poor job of explaining my problem as I probably lack to the tec

  • Reading Flow Meters from Mic Port

    Reading Flow Meters from Mic PortMarch 25

    I am attempting to read two hall-effect flow meters through the audio-in (mic) port of an Android device. I want to be able to read both flow meters independently. The audio-in port is a standard headset port so it only has one channel for the mic. T

  • Arduino audio output via R-2R DAC - biasing output for piezo speaker

    Arduino audio output via R-2R DAC - biasing output for piezo speakerJune 25

    I followed a tutorial on 8-bic DACs using an R-2R resistor ladder. I am outputting a sine-wave using data from 0 to 255 on pins 0-7. This goes through the pins into the R-2R DAC producing an analogue signal. Now I would like to convert this signal in

  • Weird samples from SAR ADC

    Weird samples from SAR ADCMay 31

    I am playing around with some SAR (Successive Approximation) A/D-converters. I have made a test circuit where I have a 16-bit DAC from Texas Instruments (R2R-based) and an 16-bit SAR ADC from Analog Devices. Using a micro controller and some SPI prog

  • Can I use ATmega328 TX/RX pins to drive an R2R network and still use the serial port to program the MCU?

    Can I use ATmega328 TX/RX pins to drive an R2R network and still use the serial port to program the MCU?May 5

    Background I wanted to make a simple function generator with an ATmega328 and an R2R resistor network, similar to Jesper Hansen's Mini DDS (Direct Digital Synthesis). To make the function generation firmware run fast enough, I believe I have to wire

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