Thursday, 16 February 2017

Power Supply - NLC - Build notes

Building a Nonlinearcircuits PSU.
This just supplies +/- 12V for Eurorack modulars.

Andrew's build notes are here:

The virgin PCBs

 Ok, lets twerk
Keeping Miley happy.

The PCB receives 12VAC from a plugpack/ wallwart
. The 1N4004 diodes split this into positive and negative waveforms.
The 4700uF capacitors then smooth out these waves
. The 7812 and 7912 regulators then convert the rectified & smoothed
signals to +12V DC and -12V DC and these are fed to the connectors to be distributed to your lovely modules.
I'm using 250v TDK film caps for the four small 100nf caps
Probably a bit overkill, but it's what i had in stock at the time.

Some pics of the 7812 & L7912 voltage regulators attached to various heatsinks.

 In the NLC build notes, Andrew stresses the importance of isolating the regulators from the heat sinks.

The smaller heatsinks came with grommets and mica insulators, so I think I'll use those.
He also recommended using heatsink paste.

Sunday, 12 February 2017

Double Knot - Synth

Thanks Cobramatic for showing me your new synth.
The Double Knot


It's very west coast. Uses Bananas for the internal patching.

Lots of great percussion.

Golden Rock - Burma

Golden Rock Buddhist pilgrimage site in Mon State, Burma.
 This precariously balanced granite boulder was according to tradition lifted by the Lord Buddah
and placed in this spot over 2000 years ago. It has remained in this position balanced by some strands of Buddah's hair.

New Years Eve.
So many people but very few foreigners.

The Rock is covered with 24K gold leaf.

The faithful
A new day

............... and a New Year.
Happy 2017

Our transport back down the mountain.

For more travel links click here:

Wednesday, 1 February 2017

Fairlight IIx - The 8 Inch Floppy Drives

Some pics of the 1980's 8 inch floppy drive.
A computer tech friend of mine said he remembered buying these for around $800 AUD back then.
This was a time when the average price of a new car was $9,000.

Taken from the rear of the computer. Ribbon & power cables removed.
The top of the drive

The underside of the drive.
In excellent condition considering its age.

 That rubber belt looks good for another 30 years.

The DS settings select the drive number.
Things really haven't changed much in this time

This was the secondary fairlight drive - used for holding the Sound Disk.
It's setting was DS2

The primary drive for holding the OS was set as DS1

Friday, 27 January 2017

Fairlight CMI IIx - Floppy Disk Controller Card

Some pics of the Floppy Disk controller card.

I'm doing some work on the Fairlight so thought I'l post some pics
of some of the hardware.

This FD controller card is the QFC9

The CMI uses two double sided eight inch disk drives.
Mitsubishi M2896-63 .
Soft sectored, 128/256 bytes per sector.
Data is stored on the magnetic coating of the floppy in concentric rings
On a standard 8 inch floppy there are 77 rings.
Tracks are divided into data blocks called sectors.
The disks look like this:

The drives themselves are controlled by a Western Digital WD 1791 LSI controller located on the QFC9 card.

This switch I understand selects which drive is the primary boot drive which will hold the Operating System disk.

SugarMountain Music Festival 2017

Thanks Melbourne for a very enjoyable festival.
I made a special trip to see Kaitlyn A Smith and Suzanne Ciani (see posts below)
but found so many other great acts.


Kaitlyn Aurelia Smith - Buchla Concert - SugarMountain 2017

Kaitlyn Aurelia Smith's concert - Melbourne, Australia, 21st Jan 2017
Sat. SugarMountain Music Festival.

 Her main instrument appears to be a modern BEMI Music Easel.

Sorry for the shaky camera. Recorded using a Samsung Galaxy Note 5.