DC voltages are listed in Purple |
#1 tip: Space is very
tight. You must plan everything very, very, very carefully.
I ended up removing the relay from my project. Reasons:
Space is really tight inside this chassis. Relay coils too
close to input jacks produce more hum. Longer signal wires
leading to and from the relay add hum. The pedal is now
dead quiet without the relay. I don't turn off the hot
switch mod anyway. I would think twice about using the
foot switch to switch any signals. I would use the switch as
power on and off and keep the signals all at the other end
of the chassis.
Keep your power transformer, bridges, voltage
regulators far away from your signal. Note how I have all the
power supply stuff on one side and the circuit parts on the other
side of the tubes.
Mount the 7812 voltage regulator on the chassis next to the
power transformer so that the chassis acts as a heat sink.
The voltage regulator gets very hot.
Cut your circuit board 3 3/4" wide so that it fits between
the bent over edges of the back cover.
I used 5/8" hex standoffs because the Illinois 22/500v caps
are 5/8" tall. Taller or larger filter caps
would not fit under the board. 5/8" standoffs work perfect
for tube height.
I changed the cathode bypass caps from .68's to 1uf's
because the .68's would not fit under the lid.
I blocked off the LED hole by the footswitch on my pedals
because they are right where my filter caps are. |
