Byron J.

Member Since: September 10, 2013

Country: United States

A few thoughts on prototyping and breadboarding

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Demonstrating a Teensy Audio-based drum machine.

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Rather than a lengthy exploration of a single subject, I'm going to touch on a couple of smaller dishes.

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I've got a project on my workbench that I was hoping to share, but I met some unexpected difficulty along the way.

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A different approach to the problem we solved last week

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Embedded Micro's new IDE and the Lucid language.

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Thoughts and ramblings about numbers, plus an interesting discovery.

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Examining one of the categories that occupies significant space on my workbench: wire strippers.

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Drive the Moog Werkstatt-01 with the SparkPunk sequencer, and starting in on a MIDI-to-CV converter.

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Experimenting with optics and imagery.

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THAT InGenius and OutSmarts Breakout Hookup Guide

March 30, 2017

Learn about the benefits of balanced signal transmission, and how to apply the THAT InGenius and OutSmarts breakouts.

Tsunami Hookup Guide

February 16, 2017

Hit the ground running with Tsunami, the Super Wav Trigger.

LP55231 Breakout Board Hookup Guide

November 3, 2016

Get to know the LP55231 9-channel LED driver., and learn how to configure and program this surprisingly flexible IC.

Proto Pedal Example: Analog Equalizer Project

September 22, 2016

Building a gyrator-based analog equalizer using the Proto Pedal.

Proto Pedal Chassis Hookup Guide

September 22, 2016

Prepare the Proto Pedal Chassis by drilling holes for controls and painting it.

Proto Pedal Example: Programmable Digital Pedal

September 22, 2016

Building a pedal around the Teensy 3.2 and Teensy Audio shield. Changing the effect in the pedal is as easy as uploading a new sketch!

Proto Pedal Assembly and Theory Guide

September 22, 2016

Getting started with the SparkFun Proto Pedal. We'll assemble the board, then discuss some of the details of the circuit.

Servo Trigger Programming Guide

May 26, 2016

Looking under the hood of the Servo Trigger -- using the development environment and some finer details of the firmware.

Hobby Servo Tutorial

May 26, 2016

Servos are motors that allow you to accurately control the rotation of the output shaft, opening up all kinds of possibilities for robotics and other projects.

Continuous Rotation Servo Trigger Hookup Guide

May 26, 2016

How to use the SparkFun Continuous Rotation Servo Trigger with continuous rotation servos, without any programming!

Button Pad Hookup Guide

January 7, 2016

An introduction to matrix scanning, using the SparkFun 4x4 Button Pad.

Discrete Semiconductor Kit Identification Guide

November 19, 2015

Get to know the contents of the SparkFun Discrete Semiconductor Kit.

Raspberry Pi SPI and I2C Tutorial

October 29, 2015

Learn how to use serial I2C and SPI buses on your Raspberry Pi using the wiringPi I/O library for C/C++ and spidev/smbus for Python.

Preassembled 40-pin Pi Wedge Hookup Guide

October 29, 2015

Using the Preassembled Pi Wedge to prototype with the Raspberry Pi B+.

MIDI Shield Hookup Guide

October 8, 2015

How to assemble the SparkFun MIDI Shield, plus several example projects.

MIDI Tutorial

October 8, 2015

Understanding the Musical Instrument Digital Interface.

Capacitor Kit Identification Guide

October 1, 2015

Learn how to identify and use a variety of capacitors using the SparkFun Capacitor Kit.

8-Pin SOIC to DIP Adapter Hookup Guide

August 13, 2015

Assembly and application of the 8-pin SOIC-to-DIP adapter.

Rotary Switch Potentiometer Hookup Guide

April 30, 2015

How to use the Rotary Switch Potentiometer breakout board, with some sample applications.

MP3 Player Shield Hookup Guide V15

April 6, 2015

How to get your Arduino groovin' using the MP3 Player Shield.

Servo Trigger Hookup Guide

March 26, 2015

How to use the SparkFun Servo Trigger to control a vast array of Servo Motors, without any programming!

Decade Resistance Box Hookup Guide

December 4, 2014

How to assemble the decade resistance box, then use it as a design and measurement tool.

SparkPunk Sequencer Hookup Guide

August 14, 2014

How to assemble and use the SparkPunk Sequencer kit.

SparkPunk Sequencer Theory and Applications Guide

August 14, 2014

Examine the inner workings of the SparkPunk Sequencer, then explore some modifications and alternate applications.

SparkPunk Hookup Guide

June 12, 2014

How to assemble and modify the SparkPunk Sound Generator kit.

Large Solderable Breadboard Hookup Guide

February 27, 2014

This breadboard has a couple of tricks up it's sleeve!

Sound Detector Hookup Guide

February 27, 2014

The Sound Detector is a microphone with a binary output. This guide explains how it works and how you can use it in your projects.
  • Four diodes in a squashed cylinder package.

    Like so.

  • It's funny...long ago I tried to get the +/-12V rails of an ATX supply to be quiet enough to drive analog circuitry...it was a lesson in heartbreak, and I swore off switch mode supplies for analog work.

    Then I took a peek inside an Apogee Ensemble, and found them using these Meanwell supplies. So I gave them a try. Turns out they're fine. Rock solid DC output, no whine or other artifacts.

  • Good catch.

    I fixed the schematic note, and pushed it to the GitHub repo. I don't have write access to the file linked above, though.

  • There's a zip file right here, or there is also the Git repository, if you're Git-savvy.

    For future reference, we usually include links like these on the relevant product page.

  • At this point, I'd recommend two things:

    First, reflow the solder joints on the TRS jacks and switch. From that bottom photo you posted, it's hard to tell how clean your solder fillets are -- some of the look like they could be cold joints.

    Second, download the board file, and use eagle to inspect the nets that lead between the jacks and switch. Select the eyeball tool, then click on the trace that leads to the IN-TIP test point. It will highlight all the segments of that trace. Then measure continuity between all of the pads that are highlighted. Then repeat with the OUT-TIP test point.

    One other thing I see in your photo is that some of your leads are a bit long. They could cause problems if they reached adjoining components, or if you put the board in a metal box, and they shorted to the box. In particular, that long wire loop at the VAUX pad looks like it wants to flop around and cause shorts.

  • The Bob Pease(tm) method for accelerating SPICE simulations:

    Hardware acceleration

  • Plug a known good TS cable into the input jack. Put one multimeter probe on the tip of the far end of the cable, and the other probe on the IN-TIP test point. They should read continuous.

    Then measure from the sleeve of the far end of the cable, to any of the GND pads on the pedal. They should be continuous. Likewise, continuous from the sleeve of the cable to the IN-RING test point. Finally, measure continuity from the tip of the cable to the sleeve of the cable. They should be an open circuit.

    Then plug the cable into the output jack, and repeat, using the OUT_TIP and OUT_RING test points. Tip->tip should be continuous, Sleeve->ground should be continuous, and OUT-RING->sleeve should be continuous. Cable tip to cable sleeve should be open.

    Finally, take two cables. Plug one into the input, one into the output. Measure continuity between the tips of the opposite ends of the cable, then actuate the switch. When the pedal is bypassed, one tip to the other should be continuous. At no time should either tip be continuous with the sleeve.

  • The switch is actually three switches that actuate together when you press the button. One section switches the LED, one section joins input-to-output when you bypass, and the third connects the FX circuit input.

    If the LED switches, then one of the three sections is working.

    You can test the other sections with a multimeter.

    If you look at the board from the solder side, each section of the switch makes a vertical column of three pads, like this.




    Measure from the center pad of the column to the pad above (1 to 2), and the pad below (2 to 3). One of them should read continuous, the other open. Then operate the switch, and open/continuous measurements should trade places.

    Repeat for each column, and report back with the results..

  • If the tips aren't connected when bypassed, the only components involved are the jacks and stomp switch. I'd inspect them carefully, and maybe reflow the solder points to make sure they're solid.

    Again, a bad cable would give very similar results.

  • Thanks for posting these: I'll take a closer look later today.

    But your statement:

    The pedal appears to work regardless of the state of the foot switch, it is just very faint in the amplifier.

    Indicates that something more fundamental is wrong.

    Without powering up, can you test continuity from the IN-TIP test point to the OUT-TIP test point? In one position of the stomp switch, they should be shorted together. In the other position, they should be open.