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Shaos
Admin
Joined: 08 Jan 2003 23:22 Posts: 22583 Location: Silicon Valley
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In April-May 2005 I got idea to build "ternary" punchcard reader that will use regular business cards as a "media" for ternary data (I have a lot of my old business cards and 1-hole manual puncher to make holes in it: As you can see we may have 10 lines with 6 places for holes - lets recognize every 2 places as 1 ternary value - no holes for O (0), left hole for N (-1), right hole for P (+1) and two holes are invalid and must not be used: To build actual reader I purchased three 1-to-5 phone cable outlets in 1-dollar store to take "pins" from it Scheme is really easy one - left hole will be connected to -5V and right hole will be connected to +5V. In 2007 actual reader board was finished and now I need to build whole device:
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31 Aug 2008 17:24 |
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eudoxie
Maniac
Joined: 17 Sep 2012 13:36 Posts: 277 Location: 81.170.128.52
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Interesting project.
I think it should be possible to achieve greater data density and human readability by using two hole dimensions (big holes for P, small holes for 0, and no holes for N). This might cause greater error frequency though, since the holes need greater precision, and the likelihood of misreadings and short circuits should increase somewhat.
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01 Sep 2008 03:56 |
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Shaos
Admin
Joined: 08 Jan 2003 23:22 Posts: 22583 Location: Silicon Valley
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I thought about something like this but decided that 2-hole approach is simpler and more reliable because it allows using of regular 1-hole puncher (that can be bought in almost any store) and manual not so precision force
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01 Sep 2008 05:21 |
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hemuman
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Hi,
Just one query:
Do we have any device which can convert AC signal to -1,0 and 1, instead of DC.
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01 Sep 2008 05:51 |
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Shaos
Admin
Joined: 08 Jan 2003 23:22 Posts: 22583 Location: Silicon Valley
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Do you mean ADC or just -5V/+5V power supply?
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01 Sep 2008 06:22 |
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hemuman
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I mean -5v/+5v to -1,0,+1
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01 Sep 2008 06:54 |
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Shaos
Admin
Joined: 08 Jan 2003 23:22 Posts: 22583 Location: Silicon Valley
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Hm, at least all my ternary hardware is doing this - converting analog signal (weak and distorted ternary signal that becomes noisy analog in relatively long cables) to -1,0,+1 in form -5V,0V,+5V
Probably you mean ADC ( Analog-to-Digital Converter) so look at this.
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01 Sep 2008 07:23 |
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hemuman
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Yes. I was looking for the same.
Thanks,
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01 Sep 2008 07:35 |
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Shaos
Admin
Joined: 08 Jan 2003 23:22 Posts: 22583 Location: Silicon Valley
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If you are talking about 1-trit ADC then it's probably just a buffer (ternary buffer):
Simple ternary buffer by Ronin (Apr 2005):
Ternary buffer by Shaos (Dec 2004) with additional outputs:
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01 Sep 2008 13:36 |
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hemuman
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I was actually looking for below:
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02 Sep 2008 00:05 |
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Shaos
Admin
Joined: 08 Jan 2003 23:22 Posts: 22583 Location: Silicon Valley
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Yes, it's a buffer - second one (2 comparators and 2 diodes) will work exactly the same way (output BUF) and you can even choose thresholds by changing resistors' values:
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02 Sep 2008 06:26 |
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hemuman
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I am not good at electronics, but I will try to understand.
how about the imaginary device
Thanks,
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02 Sep 2008 07:32 |
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Shaos
Admin
Joined: 08 Jan 2003 23:22 Posts: 22583 Location: Silicon Valley
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Your imaginary device is a ternary buffer, no?
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02 Sep 2008 17:53 |
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hemuman
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Yes,
i wanted to behave it like that.
Thanks,
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03 Sep 2008 00:22 |
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Shaos
Admin
Joined: 08 Jan 2003 23:22 Posts: 22583 Location: Silicon Valley
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OK, so my ternary buffer actually is what you want
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03 Sep 2008 19:46 |
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