[2178] Passive Mixer

Date: December 29th, 2016 | Comments : [3] | Categories: DIY.

Passive mixer schematic

In many applications, A simple passive mixer can be used to combine signals. The resistors R1 – R4 are used to reduce interaction of the signals but they do not completely eliminate it. The values may be adjusted higher for more isolation; try 100k for the resistors.


[2165] Power PCB

Date: October 26th, 2016 | Comments : none | Categories: DIY.

Power pcb

There are a limited number of the revised power pcb that are available. [Now in stock]

The new pcb has several improved/advanced features such as increased efficiency and an isolated output.

Order one (before they are gone) from the catalog page and the latest instructions will be emailed to you.



[2152] Jfet Buffer Modules are back

Date: October 3rd, 2016 | Comments : [1] | Categories: DIY.

Jfet buffer pcb Jfet buffer modules are back in stock!


[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 : [1] | 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.



AMZ Home Page

Guitar FX PCBs