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 the use of the information on these pages.
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 power amp 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
Frontpage of the website
Note: I update/correct/add to these pages from time to time. Check back.