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Japanese Guitar Effect Schematics
Tube "driver" ...
Compression / Distortion ?
Compressor / Soft Distortion
Rockin / VCF PCB
Auto Pan PCB
Stereo Box ?
Super Ring Modulator
TC Preamp w/ PCB
2 Channel Mixer
Noise Gate w/ PCB
BBD Delay PCB
Alembic Boost PCB
Harmonic Exciter
Guitar Synth
BBE AM64 ( American Metal )
The input cap (4n7) could be upped to at least 22n and there are other things one could do to this too. Clipping on a switch and so on. The power filter cap is 1000µF in the original unit, but i left it at 220µ for this layout. Both of those values are a overkill. You'd be fine with 47µ or 100µ in its place.
BBE Crusher ( Marshall Guv'nor variant ) Vero Layout
For Power supply cap you can also so use 47µ, 100µ or 220µ instead of the 1000µ.
Build an Audio Probe to diagnose Pedal Problems
Audio Probe
This is very simple yet very useful tool
for debugging new pedals. You need one 1/4″ mono plug, one 100nF
capacitor, alligator clip and some wire. Connect alligator clip to jack
shield and 100nF cap to jack tip. When debugging some circuit connect
clip to circuit ground and use other end of cap (or wire connected to
other end of cap) to follow signal path through circuit. Plug the probe
into amp and plug guitar cord to pedal input (pedal output stays
unplugged). Make someone play guitar while you’re probing circuit and
once you find a spot where nothing is heard through amp you found a
possible problem.
If you have a cap small enough you can fit into plug
casing. It will look nicer and cap will be protected inside. It can be
seen on this photo how I did it. If you can’t find any slave around to
play guitar while you’re probing the circuit it’s not a bad idea to
connect guitar cable to sound card output and just play some music on
computer.
The other way to make this useful tool is using 1/4″
jack socket and regular guitar cable. Advantage over previous design is
that you need shorter probe leads and you can use as long guitar cable
as you need.
If you have a cap small enough you can fit into plug
casing. It will look nicer and cap will be protected inside. It can be
seen on this photo how I did it. If you can’t find any slave around to
play guitar while you’re probing the circuit it’s not a bad idea to
connect guitar cable to sound card output and just play some music on
computer.
The other way to make this useful tool is using 1/4″
jack socket and regular guitar cable. Advantage over previous design is
that you need shorter probe leads and you can use as long guitar cable
as you need.
This probe includes resistors / some noise protection
Original Source: http://diy-fever.com/misc/audio-probe/