There are choices of free Gerber file viewers out Internet. I’ve tried some so I’ll take notes for archival purpose.
I decided to use GC Prevue btw.
Gerber File Viewers
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Author Archives: Gan
Analog2.0: Noise&Mixer and LFO Board Update
Analog2.0 boards update work is in progress. I’ve done with the Noise&Mixer board and the LFO board. Besides the transistor lead position fix that is the main purpose of the update, I’m putting a couple of mod points on every board, like Easter eggs.
On the left is the Noise Generator & Mixer board. On the right is the LFO board.
How to Convert Sampling Rate with Java
This worked for me.
You can convert by applying AudioSystem.getAudioInputStream to an AudioInputStream object, and you get another AudioInputStream as the result. Here is the sample code of the part:
AudioInputStream inStream = AudioSystem.getAudioInputStream(soundFile); AudioFormat outDataFormat = new AudioFormat(8000.0f, 16, 1, 2, true, false); AudioInputStream outStream = AudioSystem.getAudioInputStream(outDataFormat, inStream);In order to make above code work, we need following two extensions. Without these extensions, we get exception on the execution above.
http://www.tritonus.org/tritonus_share-0.3.6.jar http://www.tritonus.org/tritonus_remaining-0.3.6.jar
More on Semiconductor Switch
Continued from yesterday’s article. Here are the switches I compared.
Mechanical Push Switch (Tactile)
You hear click noises.
[audio:https://gaje.jp/blog/wp-content/uploads/2011/12/tactile.mp3|titles=tactile]
Relay
There are occasional pop noises.
[audio:https://gaje.jp/blog/wp-content/uploads/2011/12/relay.mp3|titles=relay]
Analog Switch
Not bad but click noise intermittently happens.
[audio:https://gaje.jp/blog/wp-content/uploads/2011/12/tactile.mp3|titles=analog_sw_chat_cancel]
JFET Switch
The most stable so far.
[audio:https://gaje.jp/blog/wp-content/uploads/2011/12/JFET.mp3|titles=JFET]
Semiconductor switch
My first Optical Organ, described in the following page, has a problem that it makes annoying click noises at key on/off.
https://gaje.jp/projects/synth_effect/optical_organ_e/
I’ve analyzed the issue, and identified that switches to turn sound on/off has the problem.
Charge Pump with Arduino
Right: charged, left: normal 5V drive
A charge pump is a circuit that boosts DC voltage. I tried to make a charge pump using Arduino to enhance power supply for a blue LED. A blue LED typically has higher forward voltage. Some ones go to 4V, so 5V-supply processors are slightly powerless to drive it. Thus a charge pump helps to enhance blue LED brightness.
As you can see in the photo above, charged one is brighter. The supply voltage was increased to 8V in this case.