Communications: electrical – Systems – Timer control
Patent
1989-08-10
1992-06-16
Crosland, Donnie L.
Communications: electrical
Systems
Timer control
340321, 340331, 340478, 340332, 315200A, G08B 100
Patent
active
051227797
ABSTRACT:
A light sequencer for a toy having a simple way for individually varying the on and off times of each stage of a chain or ring. Each stage has a light controlling amplifier/switch whose gain is individually controlled by a hysteresis element. When the voltage across the hysteresis element is below its set breakdown voltage, it non-conducts, thereby causing the amplifier/switch to have negative gain, and the controlled light is not lit. When the voltage across a hysteresis element equals or exceeds its set breakdown voltage, it `fires` into a highly-conductive state, causing the amplifier/switch to have very high gain, and the controlled light is lit. The hysteresis element remains in its conductive state until the voltage across it drops below recovery voltage level. Then it switches back to non-conductive state, causing the amplifier/switch to have negative gain, and the controlled light is not lit. The difference between breakdown or `firing` voltage and recovery voltage is the hysteresis factor. Having hysteresis factor control gain of an amplifier/switch enables use of a simple Resistor-Capacitor circuit between the stages to control the on and off times of each stage in the chain, and the period time of the chain, or loop time of a ring. Varying resistor and capacitor values of each stage will cause a pseudo-random effect, thereby provoking greater interest on the part of the viewer.
REFERENCES:
patent: 3593276 (1971-07-01), Schuler
patent: 3706972 (1972-12-01), Okuhara
patent: 3747063 (1973-07-01), Hudson, Jr.
Lehmann Roger W.
Satten Michael I.
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