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1  Community / Exhibition / Gallery / Re: Text Printer (stepper, servos, and a marker) on: March 08, 2014, 01:19:31 am
Very Cool!
Reminds me of a printer I have somewhere that uses tiny ball point pens
2  Community / Bar Sport / Re: Whiplash from a topic search ! on: February 26, 2014, 02:34:17 am
Grampa used to get asked to go all over the Mount Lofty Ranges.

He was always right on the money.

I was always sceptical, even after I dug a shallow well (3 metres) in a spot he had said was good.
3  Community / Bar Sport / Re: Whiplash from a topic search ! on: February 25, 2014, 10:58:34 pm
my great grand father used to "dowse" for water with a pendulum, he was scary accurate!

I saw him dowse with coat hangers as well.

Before you all cry "rubbish", the proof was in the well!
4  Community / Bar Sport / Re: For the seasoned contributors on: February 01, 2014, 09:02:40 pm
just to throw another spanner in the works...

isn't tab diet cola?

5  Community / Bar Sport / Re: For the seasoned contributors on: February 01, 2014, 11:47:03 am
every now and then I get strange looks when I say "Hit return"

"What's return?"

me, "You know, carriage return."

"Where's that on the keyboard?"

me, "FFS! It's the big key on the right, near the numeric keypad!!!"

"You mean enter"

6  Community / Bar Sport / Re: What do you call a citizen of the United Kingdom? on: January 03, 2014, 09:54:44 pm
Australians are inherintly racist to the English.

In the 12 years I've lived here (Australia) I've seen more casual rasists than anywhere else.... just from every day language which they think is fine...

Pom is racist, refering to color of skin .

It's an affectionate term!

Besides they need a little "push", now that they can't bat, bowl or field!!

btw, I'm WAY paler than the average ten dollar pom!
7  Community / Exhibition / Gallery / Re: Heavily Modified Power Wheels on: January 03, 2014, 02:53:13 pm
That is so cool!

Parenting, you're doing it right!!
8  Community / Bar Sport / Re: What do you call a citizen of the United Kingdom? on: January 03, 2014, 02:49:06 pm
Redcoats.. talk about the opposite of camouflage, especially with the big white X screaming "Shoot me!"

They stopped wearing red coats after the first Boer war!
Made them really easy to hit from 1000 yards away!

Here in Australia we call them "poms" or "whinging poms"

Find the video of the folks who just got rescued in Antarctica!
The difference between the Aussies and Poms is pretty funny and speaks for itself!
9  Using Arduino / Audio / Re: TL082 preamp: help please! on: October 20, 2013, 10:44:17 pm
I started of with a QUAD opamp, a TL084, then went to two dual opamps, TLO82's.

At 40Khz I was getting WAY too much cross talk between channels.

For the record it's not trivial, but it really isn't hard.

The main issues here is use multiple stages of gain instead of a single high gain stage.

When using a DUAL SUPPLY opamp you need to remember to supply biasing, thats what I've done with the voltage dividers on the positive input.

Don't try and build a non-inverting amp, go for an inverting amp, you should be able to adjust your biasing with a decent meter.

One thing I can sugest is get an old analog CRO, don't spend hundreds on a DSO, you will learn a lot just messing around with opamps and a decent 10-20Mhz CRO.
10  Using Arduino / Audio / Re: TL082 preamp: help please! on: October 16, 2013, 07:36:49 pm
This is the circuit for my ultra sonic receiver

Version 1A pretty much what you want to do

the voltage divider is to get around needing a negative supply, both stages have a gain of 100
11  Community / Exhibition / Gallery / Re: new job, profesional hacker! on: July 09, 2013, 07:56:25 am
Here is the Arduino controller

3 x 24V relays, switched with TIP110 PNP darlintons


Main "crushing" cylinder and "unlock" cylinder

"jaw disengage" cylinder

Air valves

the "maw"

Maybe NOT the dream job we all hoped for, it turns out I'm getting payed the same rate people with autism in wheel chairs get paid.
It's taken me around ten days to go from concept to V4.

Not only did I have to supply my own netbook to run the Arduiono environment on, which is now dead from being in a factory with MIG and spot welders, but I'm taking "too long".

Words can't describe how pissed off I am right now.

Worst thing is we wreck better computers than I'm using right now, but if I want something I have to bid on ebay like everyone else...

I'll post video later
12  Community / Exhibition / Gallery / new job, profesional hacker! on: July 03, 2013, 06:03:16 am
I've been employed by an E-waste recycling company that employs people with disabilities, my first task was to build a machine to break up CRT yoke ferrites, so naturally I had to sneak an Arduino in.

The rig I built is a beast, pneumatic powered cylinders that crush the yoke coils and drops them out the bottom.

It's only about 30 lines of code to control 3 cylinders.

I'll take some photo's and video, post them tomorrow.

This is THE most seriously physical thing I've built in ages!
13  Community / Bar Sport / Re: Your latest purchase on: March 19, 2013, 09:17:03 pm
I get my Pi today! AUS$40.

First project will be to get my Realtek SDR working, I've had NO luck under 'Doze, except across my network.

I was thinking of putting the 'Pi upstairs away from all the EMR, running an antenna cable outside.

14  Community / Bar Sport / Re: Your latest purchase on: March 13, 2013, 10:32:36 pm
one of the best ways to waterproof concrete is PVA, water it down about 4 or 5 to 1, let it churn in the mixer for a while.
This is a great way to waterproof ponds.

Another strengthening idea the Australian Defense Force found is wood wool, sawdust isn't good enough, you need "curly" bits.
Give them a soak in a PVA/water wash, then apply them to your first layer of concrete on a "chicken wire" base, then trowel another layer of concrete over.

Other methods are polypropylene or glass fibres mixed in.

Glass reenforced concrete is really strong, they use it here on our street racing circuit curbings.

15  Topics / Robotics / Re: Wireless IP camera and rover on: February 28, 2013, 06:37:36 am
you could do it like this

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