Circuit for producing four indications on a bicolor light emitti

Details Circuit for producing four indications on a bicolor light emitti Circuit for producing four indications on a bicolor light emitti

1991-01-02

1991-11-19

Grimm, Siegfried H.

Oscillators

Ring oscillators

315 97, 315251, 315271, 331 75, 331DIG3, 34081503, 3408151, H03K 303, G08B 536

Patent

active

050669290

ABSTRACT:
A circuit for producing four indications on a bicolor light emitting diode (LED) includes a ring oscillator, with two inputs controlling inverters of opposite phase. By enabling or disabling these inverters, either, both, or neither dies of the LED are energized, causing it to emit light of either of its two primary colors, a secondary color formed by the combination of its two primaries, or no light, respectively. Nonlinear resistances are used to equalize the brightness of the two primaries and set the hue of the secondary.

REFERENCES:
patent: 4038611 (1977-07-01), Greig
Martin, "Three-Color Signals with One Lamp", Model Railroader, Dec. 1974, p. 78.
Dunavin, "Tricolor LED Signal Circuit", Model Railroader (Symposium on Electronics, Nov. 1981, pp. 103, 104.
Mitchell, "Searchlight Signal in HO Scale (Almost)", Model Railroader (Symposium on Electronics), Feb. 1984, pp. 97, 98.
Trost, "Vier Farben mit Zweifarben-LED", Funkschan (Germany) Jan. 1982, p. 83.

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