Monday 31 May 2021

Maria Island - Tasmania, Australia

 Maria Island is quite mountainous.
It's located in the Tasman Sea, off the east coast of Tasmania, Australia.
 
 The 115.5-square-kilometre island is contained within the Maria Island National Park
 
This is the jetty 
You can get here by ferry.
 
The island is a time capsule of Australia's convict past.
There are lots of old colonial buildings.

The main town was opened as a penal settlement in 1825.
 
The penal settlement was closed in 1832 and the prisoners moved to the recently established prison at Port Arthur
 
This is the Commissariat Store, Darlington.
Darlington is the only town on the island.

The island was named in 1642 by Dutch explorer Abel Tasman after Maria van Diemen (née van Aelst), wife of Anthony van Diemen, the Governor-General of the Dutch East Indies in Batavia. 
 

 


The penitentiary.

These lodgings date back to the 1830s. It's where convicts slept. It gives you a chance to live how the prisoners did.
 
Each room has bunk beds & a wood-fired stove for heating and cooking.
There is no power, running water or lighting.
There are no stores and the island. You must bring your own food, water, camping gear, bikes etc. And of course take your rubbish home with you.
 
The island is so beautiful and clean.










Bishop & Clerk Walk.


At the northern end of Maria Island, you can see the twin peaks of Bishop and Clerk. These peaks resemble a bishop, wearing a mitre, being followed by a clergyman. 

You can walk to the top.

 
This walk takes you from grasslands through woodlands, forest and finally to rocky slopes before you reach the summit. Its not a difficult hike. 


 
This is the view from Bishops peak.
 






Saturday 29 May 2021

MST MIDI to CV Converter - sYNTHROTEK - part 2

This is part two of my build of the Midi/CV converter from Synthrotek.
Part 1 is here:
 

 

The MST MiDI to CV converter has been an easy job so far.
The components are all very nicely packaged and labelled.
Documentation is great.
 
 Finishing off the resistors on the logic board.
 
 
 
 
 
 
 
 
 
 

Just watch for shorts, esp the transistor voltage regulators.
 
My mobile phone (Samsung Galaxy 9 Note) has an amazing camera. 
The resolution is superb .
I have a microscope that I used to use to look for shorts, but I just use my phone these days. 

 
 
 
 
 
 
 
 
Time for the control board

ATTENTION: The zener diode for the MST Midi to CV Converter MUST be the Fairchild 4.7v Zener diode. The mouser part number is 512‐1N5230B. Other 4.7v zener diodes will NOT work.




Not sure how to tell the difference between the two diodes

Luckly my phone has good magnification.
You should be able to see 41 48 printed on one of the diodes.

Resistors next
Then the Trimmer pot

USB socket & jacks first.
Once I have the panel secured to the jacks , I solder .
 
Switches next
Two of these : the push button & the toggle.
 
 Install the DIN sockets


LED last
It's bi-coloured and has 3 leads.
 
For more info about LEDs:



I usually install any ICs last.
These all go on the logic board>

tHIS first one is the PIC micro-controller (MCU).
Mine came pre-programmed. 
It's a pic18f2553. It's 8-bit.

The LT 074 is a op-amp of course.

The 6N138 is an optocoupler
 

The MCP4922 is a DAC ... a digital to analogue converter.

Nearly there...



Nice.















Links
 

Wednesday 26 May 2021

Vitalise - last week

 

106-108 George St, The Rocks NSW 2000, Australia
Tomorrow at 6 PM UTC+10 – 11:55 PM UTC+10

Tickets
 
 s.c.h.e.m.e - Sydney City Humanoid Electronic Modular Ensemble
terradatkill
john jacobs
Лучи Мечты
bushranger
-
DJ cinnamon (aka zimt)
RESIDENT DJ CHRIS MOUNTFORD
resident vj atmm

I can't believe it's not a VCO - NLC Build notes

These are my build notes for the eurorack module "I can't believe it's not a VCO".
ICBINAVCO ???
 
The module is 8 HP wide and is based on ideas presented in Electronotes #132.

Andrew describes its as a "VCF with a 'filter exciter' section to allow a wide variety of acoustic, semi-acoustic and not-acoustic-at-all sounds". 
 
The filter is pinged and its output is fed back into the circuit via a VCA I think.

I guess the only way to find out is build one.

 
 
 
 
 
 
 
 

hERE are some closeups of the PCBs
Its all SMD, though still pretty easy 0805 size,
 
Looks like there are two ways to use this module.. either in VCF or VCO mode.
Its really a filter that can be used as a VCO.
I like multipurpose modules.

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 
The TL074 & TL072 op amps first.


LM13700M - on order
It's a Transconductance Amplifiers.


I have a few 
Mouser No:
513-NJM13700M

I'll try these .




Next the LL4148 diodes
The order is odd I know. I'm installing the parts I already have.


Ordered the 5V1 zener
863-MM3Z5V1ST1G


BC847 & BC857 


BCM857DS
SOT457 Mouser: 771- BCM857DS-T/R
 
Watch it's orientation.


I'll use these amps:
NJM13700M
I have some left over from building the NLC Cell Voice panel




Waiting for parts .. to be continued.





Links:



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