Ternary testing board TRInnTest-1

[Shaos]

On June 13rd 2005 I finished 5-day building of ternary testing board to test our "standard" ternary elements with 12 and 24 pins:







This is testing of TRI31 double ternary half adder:



P.S. Russain topic about this board: viewtopic.php?t=51

[Shaos]

Board uses 18 "ternary" mechanical switches, 9 "ternary" red-green LEDs, 27 resistors and 18 bipolar transistors (9 PNP and 9 NPN). Scheme consists of 9 identical blocks:



Lower 9 pins of TRInn elements may be inputs or outputs ("IO" on the scheme). Higher 9 pins are usually inputs ("I" on the scheme). Improper usage of that board may cause short circuit of power supply - if ternary switch wrongly will connect +5V or -5V to output pin when tested board will provide -5V or +5V to the same output. So all switches that connected to outputs MUST be in neutral position! As defense against this condition we can put additional 1K resistor before every IO.

[Shaos]

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