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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

Summary of Contents for Miasma

Page 1: ...Ritual Electronics Miasma Ritual Electronics Feedback Blend _ Gain Fdbk CV Level Gain CV In _ Fdbk In Fdbk Out Miasma ...

Page 2: ...2 Summary 03 Warranty 04 Installation 05 Overview 06 Controls 07 Block diagram 08 Diodes 09 Remarks 10 Patch ideas ...

Page 3: ...ar from the date of purchase Malfunction resulting from wrong power supply voltages backwards or reversed eurorack bus board cable connection abuse of the product or any other causes determined by Ritual Electronics to be the fault of the user are not covered by this warranty and normal service rates will apply During the warranty period any defective products will be repaired or replaced at the o...

Page 4: ... properly formatted distribution receptacle to operate It must be properly installed into a Eurorack format modular synthesizer system case You can refer to https www modulargrid net to plan the power consumption of your system You will need 10HP of free space in your Eurorack case to install Miasma Connect the included ribbon cable to the module the connector s red strip must face down Connect th...

Page 5: ...a header making it easy to change them and craft the sound you want There module ships with six different diodes from germanium to LEDs and you can experiment adding your own The output level may vary depending on which diodes you use this can be adjusted with the level trimmer on the front panel Controls Gain control up to 20dB Feedback VCA Blend control between dry and wet signal Attenuverters o...

Page 6: ...ences the effect Audio output 1k impedance Gain attenuverter Set the amount of CV applied to the gain parameter CW adds up to the gain knob position CCW substracts Feedback attenuverter Set the amount of CV applied to the feedback parameter Gain CV input CV input 5 5V Feedback CV input CV input 5 5V Feedback loop input Feedback input is normalized to the feedback output jack A jack breaks the loop...

Page 7: ...njects the audio into the distortion gain cell Gain cell Uses one diode per waveform polarity Gain up to 40dB Output buffer 1k impedence output Feedback VCA Controls the amount of signal positively reinjected in the gain cell Blend Crossfades from the original signal to the distorted one ...

Page 8: ...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...

Page 9: ...put level affects the overall sound of the distortion Try running your signal in an amplifier or attenuator to increase Miasma s sound possibilities When the gain increases the feedback decreases When the gain is pushed to the max you may not hear any feedback the two parameters are related Different diodes lead to different output levels This can be corrected using the Level trimmer on the front ...

Page 10: ... modulations Try to modulate both the gain and the feedback at audio rate to achieve great effects Adjacent frequencies will produce beating effect for really doomy effects Tuned frequencies are kind off mixed together which can result in chord like effects Patch notes Oscillator 1 sine wave out Miasma In Oscillator 2 triangle wave out Gain CV Oscillator 3 square wave out Feedback CV Adjust the at...

Page 11: ...a drum sequence or a tuned synth line Patch notes Oscillator triangle wave out Miasma audio in Miasma feedback out Filter audio input Filter output Miasma feedback in Tune the filter according to your oscillator Try to use the same 1V Oct signal in the oscillator and in the filter FM this will harmonize both lines Coarse Fine 1V Oct Lin FM Exp FM PWM Ritual Electronics Feedback Blend _ Gain Fdbk C...

Page 12: ...s sound Patch notes Synth Drum line Miasma audio in Miasma feedback out Reverb audio input Reverb output Miasma feedback in Envelope LFO random Miasma feedback CV Changing the reverb parameters will affect the sound Play with the dry wet parameter of your reverb Ritual Electronics Feedback Blend Blend _ Gain Fdbk CV Level Gain CV In In _ Fdbk In Fdbk Out O u t O u t Miasma Tilt Decay Absorb Size P...

Page 13: ... Patch notes Synth Drum line Amp Envelope follower audio input Amp Envelope follower audio output Miasma audio input Amp Envelope follower envelope output Miasma feedback CV Synth Drum line clock Clock divider clock in Clock divider divided out Envelope generator trig gate in Envelope generator envelope output Miasma gain CV Ritual Electronics Feedback Attack Decay Attack Decay Attack Decay Attack...

Page 14: ...orm 1 Miasma gain CV Oscillator 2 waveform 1 Miasma audio input Oscillator 2 waveform 2 Miasma feedback CV Oscillator 2 final waveform Miasma feedback in Miasma feedback out Oscillator 1 exponential FM Ritual Electronics Feedback Frequency 1 FM Bus Exponential FM Linear FM Exponential FMM od Bus Folder Shape Angle Linear FM Frequency 2 Blend _ Gain Fdbk CV Level Gain CV In _ Fdbk In Fdbk Out O u t...

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