MATRIXSYNTH: VGA Feedback Video Synth / Audio Visualizer - LoFi Future FB-200

Friday, August 13, 2021

VGA Feedback Video Synth / Audio Visualizer - LoFi Future FB-200


video upload by LoFiFuture

"Available to order here: https://lofi-future.square.site/produ...

The FB-200 is an overall improvement to the previous version of this device, the FB-100.

Keeping the same enclosure and similar basic specs this particular unit features a much more thought out signal path resulting in a more intuitive machine. The composite video processing and control circuitry is exactly the same as the FB-1000, but with just 1 LFO that can be assigned to any colour instead of 3 independent LFOs as featured on the FB-1000.

The 3 RGB pots are backlit with the corresponding colour LED. These LEDs vary in brightness depending on how high or low that knob is set and also visualises the LFO speed when the LFO is assigned to it.

The toggle switch for each channel enables that channels audio input. The FB-200 features 3 independent audio inputs that allow you to visualise more than one audio element. These are not raw audio inputs, instead it uses a switching circuit that senses peaks in the audio and sends that channel to ground briefly. This results in the familiar horizontal lines but instead of behind red, green or blue lines, the lines are the sum of the other two colours resulting in a more complex colour pallet.

The LFO section is a sine / square LFO capable of really slow frequencies or audio range frequencies (selectable via toggle switch) 3 push buttons allow the LFO to be assigned to any of the RGB channels. When the audio rate is selected it results in scanlines that can be controlled and brought into harmony with the videos scan frequency, creating slowly moving horizontal lines.

The composite video modifier is essentially a hue and contrast control rolled into one. Its is a circuit that has been specifically designed for the purpose of creating more controllable feedback loops with the dual VGA scan converter / scaler setup. Turning the knob clockwise instantly causes intense colour separation between the red, green and blue channels in the feedback loop, preventing a single colour simply washing out the screen. A toggle switch acts as a colour boost causing the feedback to become overly intense and with the flip of a switch it is instantly back in your control."

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