Saturday, 27 August 2016

3TrinsRGB+1c build pics & initial tests

3TrinsRGB+1c is an analog audio/video synthesizer

 This build took about 3- 4 hrs. It's not difficult but it's not for beginners either.
Some closeups from various angles. Hopefully this will help future builders.

The pot in the foreground is the only 20K one . ... has the gold top.

There is a transistor missing in the above pic -- to the left of the 10uf cap.

This is the 2016 version
 Note the two resistors below "VidIn"
 In the pic below, the 10R is missing.
First tests:
The middle white LED didn't work, so had to be replaced... just like in GGs video.
I don't think the LEDs effect the operation of the buttons.

Nice, the video in works perfectly.
The manual is here:

Watch this video at least twice before you build anything.
Essential viewing.

And GGs website is here:
Assembly instructions:

LZX basic patches

 Some very basic patching with an LZX modular. Using two waveform generators (right), a doepfer A110 VCO and a color video encoder.

Adding in a sensory translator and two logic modules: video divisions & video flip flops

The system is slowly coming together.

1. Advanced patches

Saturday, 13 August 2016

Serge DSG - Dual Universal Slope Generator as an oscillator

Sounds like a spaceship taking off.

I'm revisiting the serge after a very long break.
That DSG (DUSG) is wonderful. Here I'm using it as a VCO but it can be
so many things: clock, pulse divider, envelope follower, Filter, AR Envelope Generator, VCA, LFO, CV & slew limiting processor.

To use as a oscillator you need to patch the "gate out" into the "input" or into the "trigger in".

There are two outputs : Bipolar & classic.
I've patched one into a triple waveshaper (TWS) and the second into a wave multiplier.

It's great esp when used in series as each waveshaper adds a fold to the waveform.
See Ken Stones site:
The TWS will transform a sawtooth wave into a sine wave.

There are 3 sections to this wavemultiplier. Each is different.
The top section has two settings. "Lo" ... behaves like a linear VCA.
or "Hi"... clips or squares up incoming waves....good for distortion.

Middle: It gives odd harmonics which sound like wind instruments.
These odd harmonics are often described as "rough" or "dissonant".
I still like the sound ... filter like & full of resonance. The waveforms appear to be clipped using a series of diodes.

Bottom: "performs non-linear wavehaping known as full-wave rectification". (Ken Stone). It gives even harmonics.
Even harmonics generally sound more 'musical' because the original note is reproduced, although 1 or more octaves higher.

The wave multiplier is really powerful timbre modifier. ... and in such a small package.
It's ability to produce odd & even harmonics makes it very musical.
Kind of like the Buchla 296. Though this is more of a filter.

In the late 1960's Buchla made the 148 Harmonic Generator. It used waveshapers to create 9 harmonics above the fundamental. The even harmonics are created with full wave rectifiers just like in the bottom section of the Serge Wave Multiplier.
And the odd harmonics also use diodes as in the middle section of the Serge WM. 
I don't own a 148 (it's extremely rare), but the closest I have is Verbos' Harmonic Oscillator, the 262v.

Sat Jam - Buchla-R Format

This jam is some of our preparation for an upcoming concert (Sat 17th Sept) being held
by New Sound Waves.

Paul (Cobramatic) & I are planning to use a Buchla Music Easel & some Roman & MP Buchla format modules.
This section is just of the Buchla format stuff.
Modules used: 212r (Dodecca), 259r, 248r, 158p, 144p, 205r, 295r, 206r.


212r, 205r mixer, 295r filter, 144p VCO.

158p VCO

Strymon Reverb & Delay

Wednesday, 3 August 2016

NLC Bong0 - Drum - Build notes

These are my build notes for the Bong0.
Its a Eurorack module from Non-Linear Circuits

"The bong0 is a twin-T based drum module with a LED acting as a nonlinear resistor to give it some interesting characteristics.
The trigger input acts as a normal input to get your drum sound. The input marked ‘in’ can also be used, or you can jam a CV in there, or a gate or audio. You can just use the ‘in’ input without anything into the trigger.

Bong0 can also be used for basslines, drones and as a crude but useful VCO. It has about 20 passive components which are 0805 smd and 1 thru-hole TL072, meaning it is a good circuit for learning to solder smd parts and delivers way more fun than such a simple module should." (Andrew F).

More Links:
1. Muffs
2. Build notes (NLC)
3. Panel art
4. NLC Blog

"Not a smoking implement" - NLC words of wisdom.

The pots are linear 100K

As you can see in these pics I used a green LED.
The LED acts as a nonlinear resistor so i think the type of LED you choose is important.
I couldnt remember the specific specifications of the green LED that I used , but I found that the volume was very low if used as a drum.

I decided to bump it up by swapping the 470K resistor with a 1M.
 If you check the schematics this is the second -ve feedback loop of the 072 op amp.
Andrew reckons it wont hurt anything....except my speakers if I crank it to self-oscillate.

I'll try building this with a blue LED next and see if there is any difference.
Yes, the blue LED made a huge difference.
I kept the 470K resistor.


You can find more NLC builds here.

NLC 1006 filter

This is based on the ARP 1006 filter.... from the ARP 2500.
The ARP1006 is called the Filtramp.... the NLC version doesn't have the Amp bit.
It's just a prototype - the panel is an extra Andrew had left over for the NLC Serious Filter.

The world doesn't have enough ladder filters. I really love this version and can't wait to compare it to a vintage 1006. The NLC 1006 contains a two input audio mixer & a voltage controlled 24db/oct low pass filter. The cutoff frequency may be varied with control voltages or by the front panel Fc control.

Guitar Fool have schematics and a BOM of the 1006.

This is a scan of an old ARP-2500 manual of mine.


For more info:

More NLC words of wisdom

You can find more NLC builds here.