Constructors should refer to the Component Overlays along
with,
the PCB Bill of
Materials for the current value of
all components, and
the General
Construction Notes for general PCB
assembly guidelines.
The
CGS360 PCB contains 3 separate sections each
providing an ‘input’ section and an ‘output’
section. The PCB can be cut to allow the
sections to be located individually or to
remove unused sections. Carefully cut along
the white separating lines using a fine
hacksaw. Power connections for sections (2)
and (3) are provided at J25 and J35
respectively if you need to use the removed
sections.
The
preamplifier of the stomp box adapter is a
basic non-inverting amplifier with a programmable AC gain, and suppression capacitors as needed.
The input impedance is approximately 150k.
The
AC gain can be changed if needed by adjusting
the values of R15/R12 for section 1, R25/R22
for section 2 or R35/R32 for section 3 - see
table below for examples
|
ATTENUATION/GAIN |
Output
Section 1 - R15
Section 2 - R25
Section 3 - R35
|
Input
Section 1 - R12
Section 2 - R22
Section 3 - R32 |
|
|
5.5 |
|
|
12 |
|
