Sunday, 18 November 2012

board order

sent this off tonight.
note the power distro boards with space for Euro connectors.......Dan!
Also has more Korg 800dv ext input PCBs, dual VCA/panners, Envelope followers/LFOs and Vox filters/LFOs. I like LFOs.

Sunday, 11 November 2012

vocal filter

This board contains 4 LFOs, with individual and summed outputs. Plus a set of four parallel fixed and variable bandpass filters with VC Q and a VC notch filter to form a vocal effects animator. This was inpired by the Vocal Effects Waveform Animator in Electronotes, but has been changed to give more functions, use available smd ICs and to make it ridiculously complex. Each of the variable filters has an individual output, the filters are also summed and passed thru a notch filter to get the vocal effects.
The summed LFO outputs are all different, each draws the outputs of three of the four LFOs, so summed outs consist of signals from LFOs 123, 234, 341 & 124.

There is a spare OTA stage which I may implement as a VCA, but not sure if I can be bothered at this point. This design has taken nearly 3 months to complete.

It will take up 6 columns on a NLC panel, thankfully no wiring to do.

Friday, 9 November 2012

Neuron / Difference Rectifier PCBs

 AU$8 each (+ shipping AU$5 per order) 

From thread on muffwiggler:

I keep getting asked about these so have sent off a design for a pcb containing 1 of each of these circuits. 

The Difference Rectifier has 4 inputs (two + & two -) and two outputs. The Neuron has two inputs and one output. There is a pad labelled 'ext' where extra inputs can be added if desired (use a 100k resistor attached to the jack). 

All inputs for both circuits can be wired to attenuating pots if required. The two pots on the PCB are the critical Offset and Invert controls for the Neuron. The Offset is slightly modded from the previous Double Neuron PCB as it now ranges between +V and -V and its effect is halved by the 200k resistor to give greater useful range.
Schematics and demos - Difference Rectifier and Neuron

Build manual pdf 

The PCB is small so will suit Euro builders. Approx 1.5 by 2 inches.
The 2 board mounted pots (both 100k) are 1 inch apart, the idea is to mount the PCB to the panel with threaded pots. There are 2 mounting holes otherwise if you want to attach the board some other way.