bill of materials
- two PCBs
- 8 potentiometers B100k
- 5 audio jacks
- 1 placeholder and 2 skrews (nylon)
- 2 pin strips (14 pins, male and female)
- 2 pin strips (12 pins, male and female)
- 1 eurorack power socket (16 pins)
- 2 trictrol cases (2 components each)
- 6 light dependent resistors
- 2 LEDs (soft white)
What the … is a Trictrol?
You probably already know what a Vactrol is: a tiny device which contains one LED and one LDR (light dependent resistor). Vactrols are often used to manipulate the frequency of an oscillator: the LDR is part of an oscillator circuit and an external control voltage drives the LED. Depending on the brightness of the LED the LDR changes its resistance and so the frequency of the oscillator. In order to affect multiple oscillators with just one control voltage we invented a different type of Vactrol which contains one LED and three light dependent resistors. The LED is placed in an asymmetrical way relative to the LDRs. So the LDRs will behave slightly different from each other.
This kit contains the required components for two Trictrols and here is how to assemble them.
individualization
This kit can be modified in a number of ways:
- For the Trictrol you may choose other types of light dependent resistors, different types of LEDs and different body colors (available from any.frequency or print them yourself). You may also experiment with other media than air inside Trictrol. Could use semi-transparent glues, paint, film or whatever comes to your mind. Manipulating the Trictrols will affect the response of the module to the CVs.
- Choose different potentiometers. The higher the resistance the lower gets the frequency.
- If you feel fine with some SMD soldering you may change the capacitors C1 to C6 in order to change the frequency range of the respective oscillator. Higher capacities lead to lower frequencies.