| 1/4/09 |
OK, I updated the
Bass Brassmaster PCB layout based on some new info. Here's
the poop, for checking. |
| 9/17/08 |
Updated - Panning for
Fun; now includes a circuit for panning one input to two
outputs. |
| 7/23/08 |
Thoughts on amplifier
hum sources. |
| 1/22/08 |
I always wanted an AC30 head. Never found one, but I
did find the measurements
of the AC -30 head cabinet. I'll post more detail as I draw
it. Latest update 1/28/08 |
| 12/18/07 |
Traced out the Boss PH-1r
phaser schematic while doing some research. |
| 8/02/07 |
Updated - the Fender Pro
Vibrato; added gain stage for those with low gain JFETs. |
| 8/01/07 |
For you pickup winders - a Pickup
Tester to go with the conceptual CNC Pickup
Winder. These are currently only at the concept stage, but a
skilled builder should have no trouble making their own. |
| 6/30/07 |
It's BACK!!! My PCB layout tutorial "PCB Layout for
Musical Effects" is now available again. For a quick look at
what it contains hit the link just above. If you already know you
want a copy, go to Small
Bear Electronics and grab one! The first hundred copies are
personally signed by the author (that's me... I have writer's
cramp!) |
| 5/9/07 |
New - another
emulator of the Fender Pro vibrato |
| 3/8/07 |
New - a solid
state emulator of the Fender Pro vibrato |
| 11/16/06 |
New - a Modular
Phaser based on the JFET phasers like the Phase 90. |
| 10/24/06 |
New - a Leslie style
ramp/up down LFO adapted for the Phase 90 |
| 10/23/06 |
New - a Leslie style
ramp/up down LFO, adapted for the Easyvibe. |
| 8/25/06 |
Updated - the Tychobrahe Parapedal schematic
and layout (pdf) / Newparapedal.pdf - local.
The board bolts into a Crybaby shell and clones the Parapedal. Fixed
a capacitor bug and added a new negative ground version. |
| 6/24/06 |
Updated - there was a bug in the wiring diagram for
the Neovibe. That's
corrected in this write up. Notice that the write up at General
Guitar Gadgets will still have this error until it gets updated as
well. If the resolution is still not good enough, check this schematic and
wiring diagram. |
| 10/31/05 |
Lead
dress in tube amps - learn the principles behind what wire goes
where. |
| 2/14/05 |
How
to solder - step by step. |
| 12/8/04 |
A quicky - updated hum free
splitter/A/B/Y |
| 8/28/04 |
A new CMOS
Pseudorandom generator for noise and sequencers. |
| 6/14/04 |
The
Millenium C(ontinues) - a highly adaptable, cheap, easy to work
Millenium Bypass |
| 4/13/04 |
Cheap
- and good - polarity protection |
| 3/14/04 |
Schematics of
the Ludwig Phase II Synthesizer |
| 2/14/04 |
Applications
of an audio Current Controlled Amplifier. Getting a disciplined
gain controlled amplifier opens up a huge number of applications.
Here are some to start with. The chips are cheap, and you can do a
lot of analog processing. Your imagination is the limit. |
| 10/24/03 |
Variable
Stuttering Pedal. Drew the schematic, simulated it. Should work,
but I haven't built one on the breadboard yet. Updated for shunt and
series switching options. |
| 10/7/03 |
Vox again. AC30 cabinet drawing
and dimensions.
|
| 10/1/03 |
Some thoughts
on effects enclosures and rack mounting. |
| 7/27/03 |
Great
Cheddar distortion. Version 1.6, includes look at the BC. Version
1.5 includes all updates for earlier PCB's. |
| 6/5/03 |
Panning for
fun - theory and applications of a basic panning circuit. |
| 5/3/03 |
Help me check the layout! The gristle
box circuit, on a PCB. |
| 4/6/03 |
Thanks to Normand Cyr for the new GEO logos! |
| 4/4/03 |
AC30Sim
board set. Stephan Moeller's AC 30 simulator circuit. Now with
tone/volume controls,toner patterns, wiring diagrams, and commentary
on building the boards. It's ready to build! |
| 3/22/03 |
Updated - a remote footswitch
bypassing system, now includes updated layouts and wiring
diagrams. Bypass up to six effects from a remote footswitch. Also
bypass them ALL with one footswitch. Relay bypass, CMOS logic, 100%
fun. Still being developed - your input is welcome! |
| 2/27/03 |
A remote footswitch
bypassing system, now including draft PCB
layouts for review. Bypass up to six effects from a remote
footswitch. Also bypass them ALL with one footswitch. Relay bypass,
CMOS logic, 100% fun. Still being developed - your input is
welcome! |
| 2/3/03 |
The Roland
AG5 Funny Cat - a complete build-it article! Thanks to
moosapotamus and Rob Strand, without whom it wouldn't be here. |
| 12/15/02 |
The Zonk
Machine and the Hornby-Skewes Treble Booster - a PCB layout
and buildit article. |
| 07/30/02 |
By request - schematic for the Alembic F-2B
tube preamp |
| 07/24/02 |
A circuit in test - the Low Fidelity
Pedal; low fidelity/telephone/noise sound |
| 07/20/02 |
Updated - The Brass-O-Blaster (a
clone of the Maestro Bass Brassmaster). PCB layout with wiring
diagram. Updated
schematic with GEO PCB reference numbers |
| 07/01/02 |
Updated - The
Technology of Oil Can Delays - we know what oil and where to get
it! Thanks Tel-Ray page! |
| 06/15/02 |
And now for something completely different - Optimizing
coil structure for max velocity in coil guns. |
| 06/13/02 |
Mystery Circuit
#2 - what does turning that pot do???? |
| 05/22/02 |
Onboard Ric compressor - dull front view;
more interesting back view;
here's the magic
stuff. |
| 04/21/02 |
Makin' Octaves again - the Mu-Doubler
(tm). A new way to make all the octave you want. |
| 04/16/02 |
JFET
matching - Some real numbers; see what you get. |
| 04/08/02 |
Updated the Ultimate
Flanger with John Hollis' latest fixes - including mods to the
old boards and step by step instructions to bring them up to the
latest level! |
| 04/04/02 |
New Circuit Sweeping - What are
all those parts? |
| 04/02/02 |
Updated Spyder article with a pic of my steel stud
spyder supply getting prepped for drilling
Updated the Guitar Effects
FAQ with Keen's Laws |
| 04/01/02 |
Updated Circuit Sweepings - the
Adjusticator |
| 03/27/02 |
The
JFET Doubler - Screaming Octave, Righteous Distortion, and
knob to blend between the two. Updated with component values and
tuning instructions. |
| 03/26/02 |
New Circuit Sweeping - using an
LED/LDR to eliminate dual pots in LFO's |
| 03/22/02 |
Use
of Carbon Comp Resistors for Magic Mojo - is the magic real?
Come find out. |
| 03/21/02 |
A
Vacuum Tube Wah Pedal - the old Vox circuit rides
again! Now with power supply circuit. |
| 03/10/02 |
Hook it up your way - Jimi In A
Box |
| 03/03/02 |
A proposed
user interface for the ASMOP remote footswitching system. |
| 03/02/02 |
The Dallas Arbiter Trem
Face Revealed. A tested and working circuit traced from a real
unit, and a PCB layout for making your own, along with how it works.
Special thanks to Ed Crozier here in Austin for making original
units available for this. |
| 02/09/02 |
Wrap, wrap, they call it a wrapper... |
| 02/05/02 |
MOSFET Heresies Again! Make a solid
state analog of the Fender tremolo circuit for adding tremolo to
an non-tremo amp, or free up a tube for more audio gain. |
| 02/02/02 |
More
and bigger Steel Studs. I found an easy source for heavy (18
gauge) steel framing members for bigger and sturdier boxes. Still
cheap, but major sturdy. |
| 01/11/02 |
Computer
controlled Pancakes! The pancake footswitch updated to a self
contained, hard-metal bypass switch that can be made for about
US$5.00. |
| 01/06/02 |
Pancake
footswitches- make your own sturdy, reliable, good looking
footswitches for switching effects |
| 12/08/01 |
Relays
for audio switching. The basics of what goes on inside
them. |
| 12/05/01 |
A PCB
layout for the PT2399 delay chip. It's right out of the app
note, and I haven't built it, but I think the layout matches the app
note. |
| 12/04/01 |
I'm putting together the PIC powered remote
switching system. Here's a PICture of the
switch board and the eight-loop bypass board. |
| 11/27/01 |
... a DIY stomp
switch actuator made from hardware store parts! |
| 11/15/01 |
Power
supplies basics. |
| 11/02/01 |
Some updates to MOSFET
Boosters. |
| 11/01/01 |
Schematics for a Remote Footswitch Controller and
Remote Relay Bypass Board, in the ASMOP
Section. Schematics for a PWM LFO based tremolo and phaser, also
in ASMOP. |
| 10/28/01 |
Think digital, live analog. Digital assistants for
analog effects - the ASMOP*
series. Includes a PCB layout for the any-to-any remote
switching matrix controller. (*A Simple Matter
Of Programming) |
| 10/26/01 |
Complete layout, parts list, wiring diagram and
technical commentary for John
Hollis' Ultimate Flanger; |
| 10/24/01 |
Improved JFET
Matcher for JFET phasers. |
| 10/21/01 |
Updated Omnidrive
layout; |
| 10/15/01 |
Parts list and wiring diagram - John
Hollis' Flatline Compressor |
| 10/14/01 |
Updated John
Hollis' Easyvibe, Zombie
Chorus; extended MOSFET
Boosters article |
| 10/07/01 |
Updated layout
for John Hollis' Ring Frobnicator tremolo/ring modulator. |
| 10/06/01 |
MOSFET
Boosters, Chapter 1. How to design your own MOSFET boosters to
meet your own needs. |
| 10/02/01 |
Remote relay
effects switching |
| 9/30/01 |
Full
layout/wiring/parts list for John Hollis' Easyvibe. |
| 9/20/01 |
Full
layout/wiring article for John Hollis' Omnidrive; Layout and
building article for John Hollis' Titan
Boost/Octave. New techie article - When
Good Opamps Go Bad. Also updated "designing tube output
transformers" in tube tech pages. |
| 9/08/01 |
Four
new effects layouts - the Omnidrive, Phantom Wah, and Easyvibe
circuits as designed by John Hollis, and the BrassBlaster, a clone
of the original Bass Brassmaster. |
| 9/01/01 |
Guest Article - Maarten de Huu's "Construction
of Wah Pedals" - make your own foot rocker. |
| 8/19/01 |
Baa-baa
Fuzz Boost, a clone of the Bee Baa |
| 8/03/01 |
The Steel
Stud Enclosure revisited. I took some pictures of folding up a
$0.25 enclosure box from steel framing material. |
| 7/20/01 |
A simple remote bypass box. Put your pedals and the
bypass box back by your amp and run a remote switch controller up to
your area of the stage. Also a mini, guitar mountable remote
switching control. Parts
One and Two - design and some PCB layouts. |
| 7/7/01 |
Mod
your Mu-Amp/Minibooster- simple mod for higher gain and lower
output impedance. |
| 4/17/01 |
The
$0.25 effect enclosure |
| 4/17/01 |
PCB layout for Doug Hammond's "Sweet
Thing" |
| 4/12/01 |
PCB layout for Doug Hammond's "Sweet
16" |
| 3/16/01 |
Vibra-Matic,
an add-on effect for the EAN Tremolo |
| 3/9/01 |
A PCB
layout for Aron Nelson's Shaka Express |
| 3/2/01 |
Note
Processing for guitar effects. |
| 2/18/01 |
A DC
protection circuit (OK, three of them...) for solid state
amplifers. Save your speakers! |
| 2/12/01 |
Another treble/bass booster, the Apollo
Treble-Bass Booster, provided by Ron Neeley II. Also, see the
correction on the EH Axis distortion. |
| 2/09/01 |
Schematics; the EH Axis / Guild
Foxey Lady two-knob version, and the Orange
Treble/Bass Booster. Thanks Angelo Marruzzi! |
| 1/27/01 |
The Sing-Wah,
a voice-emulating sequenced wah that jumps from vowel sound to vowel
sound either in sequence or at random. |
| 01/13/01 |
A Wah
Sequencer; provides left-right, right-left, and random selection
|
