The simplest Triangle/Square wave Oscillator for your Synth
Designed by Electronic things... and stuff in France
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What's this? It's a simple but very stable triangle and square wave oscillator. The main purpose of this module is to be used as a LFO (Low Frequency Module) in a Eurorack system but also can be used…
Read More…It's a simple but very stable triangle and square wave oscillator. The main purpose of this module is to be used as a LFO (Low Frequency Module) in a Eurorack system but also can be used as an audio oscillator in your drone synth.
NEW: You can also order a black Front Panel, 4HP, in PCB material, 1.6mm thick!
The circuit is a classic integrator and Schmitt Trigger duo. The "integrator", (a constant current generator) charges and discharges a capacitor. The Schmitt Trigger flips over the charge/discharge cycle.
The frequency range is impressive, from less than a Hertz to thousands of Hertz. Frequency is adjustable with the potentiometer. No CV input. Simple.
You can use it to drive CV-able modules. Just plug a mono jack and link it to your VCO or VCA or VCF or any other VCxxxx. You can also use its output as an audio source.
| Range | Lowest Frequency | Highest Frequency |
|---|---|---|
| LO | 2.5 mHz (0.0025 Hz) | 2.4 Hz |
| HI | 250 mHz (0.25 Hz) | 245 Hz |
Check my Attenuater/Inverter module if you need to adapt or invert its output.
Powered at -12 / +12V, the maximum output amplitude swings between -6.3 / +6.3V peak-to-peak for the triangle waveform and -5V / +5V for the square waveform. The output signal can be attenuated with the potentiometer Amplitude.
Assembling this module is pretty easy and should take less than an hour. You only need cutting pliers, solder tin and an iron.
Power requirements: +12V / GND / -12V @ less than 20 mA Eurorack power connector available.
The PCB is only 5 x 5cm
In the Kit option, you will find the following: Resistors, capacitors, the 9mm potentiometers and Davies 1900h knobs, connectors, two SPDT switches, the IC and its socket.
The NEW Front panel is a 4HP 1.6mm thick BLACK PCB material. (Please note that PCB silkscreen and solder mask color can present some slight irregularities.)
The Simple LFO is featured in Kristian Blåsol's great video series "Modular In A Week" episode 4.1: Modular in a Week 4.1
Please visit https://www.davidhaillant.com/simple-lfo-1-5/ for updates, documentation and more informations.
D2 and D3 are mounted vertically, and the white band is up ("Cathode Up").
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