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----
-title: "Thor's Hammer"
-date: 2018-05-03T11:59:37+02:00
----
-
-In case you were having an inferiority complex because your friends' IBM Model M keyboards are so much louder than the
-shitty rubber dome freebie you got with your pc... Here's the solution: Thor's Hammer, a simple typing cadence enhancer
-for `PS/2`_ keyboards.
-
-.. raw:: html
-
-    <figure>
-        <video controls loop>
-            <source src="video/thors_hammer.mov" type="video/h264">
-            <source src="video/thors_hammer.webm" type="video/webm">
-            Your browser does not support the HTML5 video tag.
-        </video>
-        <figcaption>A demonstration of the completed project.
-            
-            <a href="video/thors_hammer.mov">h264 download</a> /
-            <a href="video/thors_hammer.webm">webm download</a>
-        </figcaption>
-    </figure>
-
-The connects to the keyboard's PS/2 clock line and briefly actuates a large solenoid on each key press. An interesting
-fact about PS/2 is that the clock line is only active as long as either the host computer or the input device actually
-want to send data. In case of a keyboard that's the case when a key is pressed or when the host changes the keyboard's
-LED state, otherwise the clock line is silent. We ignore the LED activity for now as it's generally coupled to key
-presses. By just triggering an NE555 configured as astable flipflop we can stretch each train of clock pulses to a
-pulse a few tens of milliseconds long that is enough to actuate the solenoid.
-
-.. raw:: html
-    
-    <figure>
-        <img src="images/thors_hammer_schematic.jpg" alt="The schematic of the PS2 driver">
-        <figcaption>The schematic of the driver stretching the PS/2 clock pulses to drive the solenoid.</figcaption>
-    </figure>
-
-
-Since PS/2 sends each key press and key release separately this circuit will pulse twice per keystroke. It would be
-possible to ignore one of them but I figure the added noise just adds to the experience.
-
-Built on a breadboard, the circuit looks like this.
-
-.. raw:: html
-    
-    <figure>
-        <img src="images/thors_hammer_breadboard.jpg" alt="The circuit built on a breadboard">
-        <figcaption>The completed circuit built up on a breadboard and attached to a keyboard.</figcaption>
-    </figure>
-
-
-Since my solenoid did not have a tensioning spring I used a rubber band and some vinyl tape to make an adjustable
-tensioner. The small orange USB hub serves as an end-stop because I had nothing else of the right shape. The sound and
-resonance of the thing can be adjusted to taste by moving the end stop, adjusting the tensioning rubber and tuning the
-excitation duration using the potentiometer. My particular solenoid was a bit slow so I added some pieces of circuit
-board as shims between the plunger and the case to limit the plunger's travel inside the solenoid core.
-
-.. _`PS/2`: https://en.wikipedia.org/wiki/PS/2_port
-
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