Monday, 19 March 2018

Mutant Bassdrum - Hexinverter

Some picks of this great module i just finished building.

These aren't really build notes but I hope it will help others in their quest to build one of these.
Its not a difficult build at all.
All through hole components.

There are 2 PCBs. ... this is the lower.
The upper PCB holds the LEDs, pots etc.

Below are pics of the build process... working backwards.

 Be careful with the orientation of the vactrol.

Now I want to build all the drum modules. :-)


Monday, 12 March 2018

Modular on the Lounge - second meeting

A great night had by all.

Visuals were provided with a LZV Vidiot video synth

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Sat 10th March.
Wollongong, Australia.

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We will try to hold these events regularly ... every 2 to 3 months

Jerusalem - Mount of Olives Cemetery, Israel.

This is the most important cemetery in Jerusalem. It started during the first Temple period and It is still being used today.

The cemetery contains anywhere between 70,000 and 2 or 300,000 tombs

 During the First and Second Temple Periods the Jews of Jerusalem were buried in burial caves scattered on the slopes of the Mount, and from the 16th century the cemetery began to take its present shape.

..: According to Jewish tradition, it is here that the Resurrection of the Dead would begin. The Messiah would appear on the Mount of Olives and head toward the Temple Mount.

 Ariel view

WikiAir IL-13-06 039 - Mount of Olives.JPG
By Neukoln, CC BY-SA 3.0, Link

For more travel postcards click here:

Sunday, 25 February 2018

Wasp - Synth tests.

This synth has been midified. I used the Elby Designs miniMIDI-WASP interface

Using a Korg SQ-1 to trigger.

LOvely sounding filter....12dB-per-octave VCF that has a range of about 3Hz to 16Hz.  
It's CMOS based, using the 4069.
The CD4069UB (unbuffered) consists of 6 CMOS inverter circuits.
The digital inverters are used as an op-amps causing distortion and that "dirty" sound we all love.
The "EDP Wasp" was built at end of the seventies by the UK company "Electronic Dream Plant". The designers were Chris Huggett and Adrian Wagner.
The Wasp was probably the world's first battery-operated, portable, digital synthesizer.

Chris Huggett who co-founded Electronic Dream Plant (EDP) also founded the Oxford Synthesizer Company (who made the OSCar).
He is currently a design consultant for Novation . 

Adrian Wagner is the great-great grandson of the famous nineteenth-century opera composer, Richard Wagner.

The sounds of this synth can't only be due to the filter. It has to be due to the combination of the VCOs and VCF; the sound is very impressive. The VCO source is surprisingly analog. A couple of 555 timers!. If I'm reading the schemo correctly, their outputs appear to be converted to digital (four 4013) and then eventually fed into a couple of phase locked loops (4046)
The VCF sounds great when filtering a sawtooth wave, especially if modulated by the LFO random output and Envelope Generator.

The modulation controls are unusual in that in the middle position they do nothing. Twisting them clockwise will increase modulation. Twisting them anti clockwise will invert the modulation voltages.

If you ever come across the deluxe Wasp give it a go. Apart from the lovely wooden exterior, it boasts a external input, plus a volume control for each VCO.

+ Ken Stones CGS page on the twin CMOS VCF
+ Schematic
+ Elby Designs miniMIDI-WASP interface 
Jasper - DIY clone of the wasp
+ Muffwiggler jasper build thread

Saturday, 24 February 2018

Make Noise Krell patch

Reminds me of the old Buchla Krell patches.
The name originates from the film Forbidden Planet
Its a 1956 American science fiction film produced by Nicholas Nayfack, directed by Fred M. Wilcox and starring Walter Pidgeon, Anne Francis and Leslie Nielsen.

This is self playing.

The Make Noise only has one random voltage source and one VCO, but it's still very flexible.

The film was groundbreaking as the first of any genre to use an entirely electronic musical score, courtesy of Bebe and Louis Barron.

+ Krell search

Wednesday, 21 February 2018

CMOS cookbook

Awesome book.

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I think this is an essential text on all things CMOS.
The author is Don Lancaster.

"TTL Cookbook was equally solid!"

Others in this series are :
The IC opamp cookbook

 and Lancaster's "Active Filter Cookbook".

+ CMOS page 
+ DIY page 
+ TTL page

Tuesday, 20 February 2018

dIVISION 6 - Business Card Sequencer

A very easy build. The PCBs came as a kit with components.
 I'll definitely buy the bigger one.

I bought this as a kit, with all parts including the microcontroller.

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+ Division6
+ BOM and assembly