[2144] How to Mod FX Pedals With Arcade Buttons

Date: August 30th, 2016 | Comments : none | Categories: DIY.

AMZ dpdt relay pcb

DJ Tech Tools has a new article (and video) on How to Mod FX Pedals With Arcade Buttons using the AMZ DPDT relay switch. Check it out!

How to Mod FX Pedals With Arcade Buttons


[2132] Dual Op Amp Modules

Date: August 4th, 2016 | Comments : [6] | Categories: DIY.

Opamp buffer module

Buffer, or Booster, or Direct Box.



[2124] A-B switcher

Date: May 9th, 2016 | Comments : none | Categories: DIY.

A-B switch box

My new A-B switch box for comparing pedals. (more…)


[2108] AMZ Guitar FX Newsletter Signup

Date: February 22nd, 2016 | Comments : [1] | Categories: DIY.

fx pedal messNewsletter Sign up for the AMZ Guitar FX Newsletter for free information, tips and tricks on building guitar effects circuits and how to use them.

This is a “low traffic” newsletter, so you don’t worry about your inbox filling up.

Update: Okay, I’m planning more than just a newsletter. How about some podcasts, and videos, or maybe schematics just for subscribers. PC Board giveaways are also in the works. I’m not sure what will be the final outcome, but you don’t want to miss out!

Sign up for the free newsletter.


[2100] TRS Stereo Breakout Box

Date: February 10th, 2016 | Comments : none | Categories: DIY.

TRS stereo to dual mono converter

My latest build: (more…)


[2097] Buffer for Piezo Pickups

Date: February 2nd, 2016 | Comments : none | Categories: DIY.

AMZ Buffer pcb

I just updated the support page for the Buffer pcb with instructions for using the board with piezo pickups.


[2087] Reverse Voltage Protection

Date: January 28th, 2016 | Comments : [7] | Categories: DIY.

Reverse Voltage Protection

This is a typical reverse voltage protection circuit used on many guitar effects pedals. I have used it at times myself and it is effective within limits.


[1943] 9v Battery Impedance

Date: January 5th, 2016 | Comments : none | Categories: DIY.

9v Batteries

Measuring the Characteristics of Depleted Batteries, new post in the Lab Notebook.


[1921] LED Calculator Updated

Date: December 15th, 2015 | Comments : none | Categories: DIY.

Colored LED I have updated the LED calculator to show the wattage required for the resistor that is in series with the LED. A 1/4w resistor should be enough for most stompbox indicators, however, I am currently using a lot a 1/8w resistors and this allows me to verify that the resistor is operating within safe limits.

Try out the AMZ LED Calculator


[1918] Little Angel Chorus – NYE v2

Date: December 11th, 2015 | Comments : [2] | Categories: DIY.

Little Angel chorus prototype

A couple of years ago I posted an article about a revised version of the Little Angel Chorus, which uses the PT2399 delay chip. I finally got around to doing a few mods on it to see if I could further improve the sound.



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