Bob Richards' Audio Projects Index Page

 

WARNING: Tube circuits contain high voltages and are dangerous to work on. The author is not responsible for any personal injury or property damage caused by use of the information on these pages.

 

Who's Bob ?

 

The Dynaflow 18W Guitar amp 2023

 

Small Monopolar Preamps 2020

 

The Vermillion, 2019 Hi-Fi Speaker System

 

Plan B Speaker System 2019

 

Bluesman 2018 - 20 Watt Guitar Amp Project

 

Bob's Bluetooth Lithium Battery Operated Class D Boom-Box Project

 

My "Tonemeister" Stereo Preamp

 

My Tube Type Hi-Fi amplifier, "The Music Box"

 

My LM3886 Four Channel Poweramp 2020

 

My LM3886 four channel poweramp Project 2016

 

The 2 > 3 channel Extractor Project 2016



 

AR4XC Bookshelf Speaker System



 

My Open-Baffle Hi-Fi Speaker System, "The Aurium Waveguide"



 

My Woofers - Sealed Box, 12 inch Drivers, Active EQ, Acoustically relatively flat 20HZ - 100HZ:



 

My Stereo Holographic Soundbar Speaker system using the Polk Method of inter-aural cancellation

(a failure, but good learning experience)



 

My All Tube 70 Watt True Stereo Guitar amp, The Deuce



 

How to Design an all tube, no feedback, 30 Watt, Stereo Guitar Amp, - The Deuce Jr.

My 8 Watt Single-ended EL34 guitar amp, The Bluesman



 

My earlier 5 Watt Tube-Type Guitar Amps



Refurbishing the RCA 9-JY



 

My Behringer Mod - DEQ2496 Analog I/O Redesign

 

Gallery of some of my much earlier projects



 

My Thoughts on Acoustics



 

My thoughts on Speaker Design



 

 

Opamp Usage Advice



Front page of website

 

Note: I update/correct/add to these pages from time to time. Check back.

---

Random Other Stuff :

 

This is my Engineering Assistant, Snowball.



 

Grow your own amp, organically.



 

The Proper Way to Grow Tweeters