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Rob — Mon, 21 Jun 2010 05:01:31 GMT

Rob:

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My name is Robert Carter. Collected here are images, writing and links to my work and the work of others that I find interesting, inspiring or curious.
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[[Image:Magic Garden closeup.jpg|398px|link=Magic Garden]]
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[[Image:Doro.jpg|398px|link=Doro - A short film]]
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Blake

Rob — Mon, 31 May 2010 01:44:25 GMT

Rob:

[[Image:Blake Ange and Luna 1.jpg]]

[[Image:Blake Ange and Luna 2.jpg]]

[[Image:Blake and Luna 2.jpg]]

[[Image:Blake.jpg]]

[[Image:Blake Ange and Luna 3.jpg]]

Archives

Rob — Tue, 06 Apr 2010 04:26:56 GMT

Rob: Created page with '<span style='font-size:11pt; font-weight: lighter; color: #777;'>Recently added</span> {{NavBox |image = Photodiode_in_situ.jpg |link = Fan oscillator }} {{NavBox |image = Juicy…'

<span style='font-size:11pt; font-weight: lighter; color: #777;'>Recently added</span>
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|Oscilloscope
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<span style='font-size:11pt; font-weight: lighter; color: #777;'>Previous stuff</span>
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|Album covers
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|Ampex
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|FRAK series
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|Skyhawk series
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|Solex series
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|Tony's girl series
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<div class='nav-box'><div class='nav-image'>[[Image:Wedding.jpg|130px|link=http://mintmedia.co.nz/wedding]]</div>
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Timber

Rob — Sat, 13 Feb 2010 02:15:46 GMT

Rob: Created page with '500px 500px'

[[File:Timber.jpg|500px]]

[[File:Timber closeup.jpg|500px]]

Fan oscillator

Rob — Mon, 18 Jan 2010 21:31:27 GMT

Rob:

__NOTOC__[[Category:Electronics]]
I wanted to make a simple synth that produced nice bass sounds. [http://gieskes.nl/instruments/?file=synth-fan Gijs Gieskes] fan synth project shows a simple circuit to make an oscillator based on a fan. Gijs has done some interesting original stuff so check his site out.

The oscillator would generate analogue frequencies down to the [[W:Absolute_threshold_of_hearing|limit of human hearing]]. It also has some very nice distortion threshold conditions.

The on/off switching you hear in the second clip is me turning on and off a lamp above the photocell - the lamp acts like a distortion pedal.

<html><object height="81" width="100%"> <param name="movie" value="http://player.soundcloud.com/player.swf?url=http%3A%2F%2Fsoundcloud.com%2Fvdu23%2Ffan-audio-test-1&show_comments=true&auto_play=false&color=18400c"></param> <param name="allowscriptaccess" value="always"></param> <embed allowscriptaccess="always" height="81" src="http://player.soundcloud.com/player.swf?url=http%3A%2F%2Fsoundcloud.com%2Fvdu23%2Ffan-audio-test-1&show_comments=true&auto_play=false&color=18400c" type="application/x-shockwave-flash" width="100%"></embed> </object> <span><a href="http://soundcloud.com/vdu23/fan-audio-test-1">Fan audio test 1</a> by <a href="http://soundcloud.com/vdu23">vdu23</a></span></html>

<html>
<object height="81" width="100%"> <param name="movie" value="http://player.soundcloud.com/player.swf?url=http%3A%2F%2Fsoundcloud.com%2Fvdu23%2Ffan-synth-test-with-lamp-switching&show_comments=true&auto_play=false&color=18400c"></param> <param name="allowscriptaccess" value="always"></param> <embed allowscriptaccess="always" height="81" src="http://player.soundcloud.com/player.swf?url=http%3A%2F%2Fsoundcloud.com%2Fvdu23%2Ffan-synth-test-with-lamp-switching&show_comments=true&auto_play=false&color=18400c" type="application/x-shockwave-flash" width="100%"></embed> </object> <span><a href="http://soundcloud.com/vdu23/fan-synth-test-with-lamp-switching">Fan synth test with lamp switching</a> by <a href="http://soundcloud.com/vdu23">vdu23</a></span>
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This is what it physically looks like - see Gijs site for the schematic diagram (the section on the right).

[[Image:Fan oscillator on breadboard.jpg|600px]]

That's not quite true, the fan itself is connected to a 10K pot to control it's speed.

The next step is the build this into a half-way decent instrument and perhaps add a light sequencer to allow you to chop up the sound.

==See also==
*[http://www.jaycar.co.nz/productView.asp?ID=ZD1950&CATID=33&form=CAT&SUBCATID=245 IR Phototransistor]
*[[Wikipedia:555_timer_IC|555 timer]]
*[http://home.cogeco.ca/~rpaisley4/LM555.html Extensive LM555 oscillator circuits]
*[http://www.jaycar.co.nz/products_uploaded/ZD1948.pdf datasheet for the photodiode]
*[http://chiphacker.com/questions/1485/sensing-light-and-outputing-voltage-suitable-for-audio/1493#1493 Chiphacker question and answers]
*[http://delicious.com/robmint/electronics Datasheets and links]

Juicy Threes brake pad service

Rob — Fri, 15 Jan 2010 00:27:13 GMT

Rob:

These are hydraulic disc brakes and it's tricky to replace the pads. The system uses a non-standard bleed nipple which requires you to buy a special kit. I didn't want to go to this trouble, so here is how I replaced the pads with minimum fuss.

Firstly don't remove the bake calliper from the frame, just remove the wheel and sit the bike upside down. Don't touch the brake lever at any time during the work, other wise expect to spend an hour or so pushing the brake piston back into the cylinder.

[[Image:Juicy Threes old pads rear view.jpg|500px]]

Push a small flat head screw driver between the outside of each pad - the side that does not touch the disc. There should be a small amount of play where the pad backing plate can move. Lever the brake piston to push it back into it's cylinder - use a medium amount of force so as not to damage the piston.

Do this on both sides so both pistons give you clearance to remove the old brake pad assembly. The two pads are installed with a spring clip that separates them from the disc when the pistons are retracted, when not under braking.

You should be able to remove each pad one at a time, then the spring.

[[Image:Juicy Threes old pads disassembly.jpg|500px]]

At this point you should check you piston clearance to make sure the pistons are retracted. Be very careful not to touch the brake lever when the brake is in this state.

[[Image:Juicy Threes rear view no pads.jpg|500px]]

Remove the new brake pads from the packaging and remove the protective cardboard between the pads. Holding the pads and spring together push them into the brake calliper - making sure you have them the right way around.

I helps if you remove one of the pads to let the spring and the other side fit more easily. You can then use the small screwdriver to bend the spring to let you fit the second pad behind it. Each pad will click into the calliper fitting with it's two ''ears''.

[[Image:Juicy Threes rear view new pads.jpg|500px]]