DOBOZ - Touch Sensing Note Memory - Buchla format 4U --- part 1

These are my build notes for the DOBOZ TSNM module

 I like the compact format.

Its a sequencer +

 

Here are some pics of the raw PCBs

 

There are two versions of this module .

One uses a teensy 3.2, and a second uses a teensy 4.0

i bought this board many years ago when teensy's 3.2 were plentiful.

I recently received a NOS 3.2, so thought I'd finish this build.

My board is from 2017. rev 1.0

MPR121 breakout board.

Links

+ Official site

+ BOM 

+ official build notes

SEMICONDUCTORS first

Orientation of IC1-IC5 and IC7, Q1, D1 and D2 is clearly designated on the PCB. 

74HC595 2 IC3, IC4 - shift registers

mouser 595-SN74HC595DR

 

 

OPA171

IC5 

SOIC-8 operational amplifier 

mouser 595-OPA171AIDR

TL072

 IC1 

SOIC-8 dual operational amplifier 

mouser 595-TL072CDR

 

 

ADP150-3.3V 

IC7 TSOT-5 linear voltage regulator 

Mouser 584-ADP150AUJZ-3.3R7

 

"The trickiest part may be the DAC8560 (IC2), it’s a VSSOP-8 device. 

This is hand soldered

 

Use lots of flux , a fine soldering tip and fine solder.

... and a steady hand

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MMBT3904 

Q1 SOT-23 NPN bipolar transistor 

Mouser ;512-MMBT3904

I didn't have this exact transistor.

I used this instead:

Encoder: ordered and arrived.

Mouser No:

858-EN11-HSM1BF20

Mfr. No:

EN11-HSM1BF20

Mfr.:

TT Electronics

 

 

Resistors..

Some of the resistors need to have 0.1% tolerance

2 x 100K, (R1 & R15)

1K x 1, 

27k, 

33k, 

teensy 3.2

mouser

coco.

My 5U sequencer setup

 Currently I have five sequencers in my large format 5U setup

1. Moog 960

2. Two q960 synthesizer dot com  sequencers

3. Klee

4. MFOS sequencer.

The MFOS is difficult to clock without a mod.

These modifications often involve using a simple op-amp circuit (like a TL072) and a CD40106 inverter to boost and shape the incoming clock signal.

In some cases two CD40106 hex inverters connected in series may be necessary in order to give the gates and triggers being fed to the MFOS gear CMOS characteristics.

The op-amp acts as a buffer and gain stage to amplify the incoming clock signal. The CD40106 then inverts the signal and shapes it into a clean square wave that the sequencer can understand.

Till I get around to doing this I've found that the output of the MFOS sequencer drives the others quite well. Here is the basic patch.

NLC - Is Carp Lust Wrong? - Build notes

These are my build notes for the nonlinear circuits "Is Carp Lust Wrong?" module.

It's a eurorack module. 

What exactly is it? 

It's a module loosely based on the Karplus Strong algorithm.

Karplus Strong is a pretty obscure synthesis method developed in the 1980s and used in physical modelling mainly of plucked strings

It was named after its principal inventors, Kevin Karplus and Alex Strong.

Think about how a acoustic string instrument works. 

When you first pluck the string it vibrates like mad. It has waveforms which are rich 

in harmonics. These initial waveforms are determined by  the mass and tension of the string. 

After being plucked, the string looses energy over time and becomes less complex, resulting in a "purer" tone with fewer harmonics. Eventually, the vibration stops, when all the energy is gone.

Basically the module works by exciting the delay with a burst of noise and running the feedback up...& changing the delay time to change the pitch and tone.

Links

+ Wiki

+ BOM..

Some of the parts aren't super common so I'll probably need to do a order from mouser 

(or your fav supplier) I think.

LM78L05 - +5V voltage regulator

LM13700M... yes

555 timer .... its a NE555 (yes)

BC857 x5 , BC847 x4

S1JL rectifier (the dot is the cathode)

                                                                                                                                Diodes = LL4148

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Waiting for parts....

V3207 or V3205 BBD chip ... order  ... you only need one of these !!!!

The V3207 is a cool audio replacement for the 1024-stage BBD analog delay Panasonic MN 3207 chip.

I ended up buying a DIP 8  coolaudio V3205 chip on ebay.

5v1 zener...on order ... tayda

I ended up using a 5V6 zener

J309 FET 

CD 40106

..

.

NLC - More (cowbell drum module) - Build notes

These are my build notes for the nonlinear circuits "more" module.

It's a eurorack module.

This module contains three individual cowbell circuits based on those in the Roland TR-808.

Links

+ Wiki

+ BOM

As far as parts go there isn't anything rare or hard to find.

CD 40106 

& three Opamps - TL072

CD40106 (CMOS IC with 6 Schmitt trigger inverters)

The really cool thing about this circuit is that it uses a logic chip to make metallic noise

Each bell uses 2 of the 6 oscillators.

I think in the 808, similar circuits provide the basis for the cymbal & hi hat sounds

The original 808 used band pass filters to remove the upper and lower partials.

Andrew's description is as follows:

"The filters are fixed as per the original design. This means the output

is loudest when the oscillators are set close to the operating frequency

range of the filters and softer when the oscillators are at much higher

or lower settings. For me, this seems fine, but mess with the filter

values if you like. I have seen some mods of the 2k2 to ground resistor

varied to change the filter range. In proto-typing, this was

experimented with but I didn’t feel it was much improvement."

resistors next

Diodes: LL4148

These are the power protection voltage rectifiers... or just use a 10 ohm resistor and dont plug the module in backwards.

You'll need a through hole +5V 100mA voltage regulator : 78L05. 

power header

Transistors : BC857, 847

Six 1M pots.

12 sockets

The accent input is tied to the trigger input via the switch tab,

probably best to use a gate rather than a trigger to get the sound going,

but that depends on what you want to do. Otherwise patch whatever you

like to make things happen.

This is a dense but easy build.

More links

+ Hackaday

+ Roland TR-808 cowbell rebuild

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You can find more NLC builds here.

http://djjondent.blogspot.com.au/2015/03/non-linear-circuits-ncl-index.html

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NLC - Fourier - build notes... part 1

These are my build notes for the Nonlinear Circuits Fourier module

Its a eurorack  format 24 HP module.

Its a big build.

This module is based on an article presented by E. Muller (Jan 1983 Elektor link to archive.org)

https://archive.org/details/ElektorMagazine/Elektor%5Bnonlinear.ir%5D%201983-01/page/n37/mode/2up

BTW this Elektor magazine is a great resource of info.

"the process of decomposing a function into oscillatory components is often called Fourier analysis, while the operation of rebuilding the function from these pieces is known as Fourier synthesis." Wikipedia.

Fourier synthesis is the process of building a particular wave shape by adding sine and cosine waves.

The module  follows the basic principles of Fourier Synthesis, with the pots (or inputs) allowing 

control of 7 sine and 8 cosine signals. These are supposedly the harmonics of the initial signal. “Supposedly” because, the waves are not pure sinewaves, rather stepped pulse waves.

This synthesis technique is also called additive synthesis.

You can use it for Fourier Synthesis or as a sequencer/pattern generator.

 If you are into shifting soundscapes and drones, this is a great tool.

Links

Wiki

BOM

Youtube

Parts

CD4029 2 Mouser Part No: 595-CD4029BM96

DG406 or DG506 (usually cheaper) x 2 

Mouser Part No:781-DG506BEW-T1-GE3

I ordered the 781-DG506BEW-T1-GE3 ... about $8 each

TL072 or TL082 1 Soic Tayda: A-1139

TL074 or TL084 10 tayda A-1137 or A-1140

LL4148 6 sod-80 Tayda: A-1213

To be continued.....

Part 2 is here:

• NLC Fourier module DIY part 2

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You can find more NLC builds here.

http://djjondent.blogspot.com.au/2015/03/non-linear-circuits-ncl-index.html

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NLC Stochaos - Build notes

These are my build notes for the nonlinear circuits "stochaos" module.

It's a 8hp eurorack.

STOCHAOS...... It's a random rhythm pattern generator or sequencer which produces gates and control voltages 

There are just two inputs ; IN & RST

Everything else is an output

Links

+ Wiki

+ BOM..

+ CD4028 BCD to Decimal converter

+ Flip Flops - an introduction 

+ CMOS & Lunetta synths

This is a decent sized build using 2 PCBs

Start with the ICs and transistors.

The module uses a lot of cmos

CD4070  x2....... XOR

CD4040 x2  .... clock divider 

CD4040 clock divider's outputs feed the four binary inputs of a CD4028 BCD to Decimal converting chip, creating pseudo-random sequences, depending on different CD4040 outputs feeding different CD4028 BCD inputs.

"The circuit can be easily modified by replacing the two 4070 XOR chips with two 4081 AND chips (or any other 4 channel two input logic chip – OR, NAND, XNOR, NOR). I might Build both versions ....the one-gate-at-a-time version tends to get a much faster clock signal" (Andrew F). 

CD 40175... Quad D-type Flip-Flop

CD 4028....... BCD-to-decimal Decoder

Resistors

Pink noise level :

*** 1M-10M? x 1 ........................select for pink noise level .

................ im using a 10M

RL (LED resistor)  x 9 ..............select resistor to suit LED

brightness (prob 4k7 to 10k) ..... im using 4.7K

....

power rectifier BAT54GWX

Diodes

LL4148

5mm LED for chaos circuit on top PCB, any

crappy LED is fine but high V-on is

good so a blue one if you have it.

headers to unite the two PCBs

switch

SPDT - 

on-off-on

Jacks

3mm LEDs x 8 ....Up to you, diffused lens are easier

on the eyes. Square hole = anode 

I always do these last.

You're there

First tests.

The LEDs light up. That's promising.

the input needs a SAW or SQUARE wave 

Sine & Tri waves don't trigger the module very well.

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You can find more NLC builds here.

http://djjondent.blogspot.com.au/2015/03/non-linear-circuits-ncl-index.html

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