User:PlasticStylus/sandbox


 * Add examples
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 * Five color theorem
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This is a copy of this version of the Parametron article https://en.wikipedia.org/w/index.php?title=Parametron&oldid=1039896672, with some edits.


 * https://patents.google.com/patent/US2948818A
 * https://academic.oup.com/comjnl/article/2/3/122/417060
 * https://ieeexplore.ieee.org/document/4065825

= Parametron =

Parametron is a logic circuit element invented by Eiichi Goto in 1954. The parametron is essentially a resonant circuit with a nonlinear reactive element which oscillates at half the driving frequency. The oscillation can be made to represent a binary digit by the choice between two stationary phases π radians (180 degrees) apart.

Parametrons were used in early Japanese computers from 1954 through the early 1960s. A prototype parametron-based computer, the PC-1, was built at the University of Tokyo in 1958. Parametrons were used in early Japanese computers due to being reliable and inexpensive but were ultimately surpassed by transistors due to differences in speed.

First Type
This uses two metal cores, and one capacitor

Second Type
This uses one inductor, and two capacitors

Making logic gates from parametrons
The outputs of a parametron is an AC signal, and the phase determines whether its 0 or 1.

We can combine three AC signals, by feeding them into the same metal loop (transformer?).

We can think about the net effect of the all three of these coils: Observe that if we fix A to 0, we get an AND gate; if we fix A to 1, we get an OR gate.

NOT gates can be made by reversing the direction of the coils.