8
Diodes
Miasma uses two diodes to rectify the signal. These diodes
define the colour of the sound. By making these diodes
interchangeable you can achieve a great palette of sounds.
The diodes create a different shape of distortion. There is one
diode per waveform polarity, to achieve asymetrical distortion.
The diodes influence both the distortion sound and the feedback
texture and pitch. See the waveforms on the adjacents illustrations.
Different diodes have different current and voltage consumption,
this can yield to volume increase or decrease from a configuration
to an other.
Miasma is shipped with 6 different type of diodes:
• 1N4148
• 1N914
• BAT42
• 1N60
• Blue LED
• Red LED
You can of course try your own!
Follow the instructions and only put diodes in the header.
Anything else put in the diode header will void your
warranty.
Diodes mount
Always disconnect Miasma from the power supply before changing the diodes!
The female header on which the diodes are mounted is located on the back PCB board
of Miasma. You can access the header without disassembling the module. Though the use
of twizzers is recommended if you don’t take the back board appart from the top one.
fig. I & fig. II
These are both valid ways to mount the diodes if you want to rectify both sides of the waveform
fig. III
By using only one diode, you’ll create asymetrical distortion and rectify only one side of the
waveform (it is recommended to do so with the germanium diode which sucks a lot of sound and
prevents feedback when combined with another type of diode)
fig. I
fig. II
fig. III
