Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1986-01-31
1987-06-23
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250214R, 250221, 446297, 446397, H01J 4014
Patent
active
046755195
ABSTRACT:
A toy having an optically actuated sound generator includes first and second phototransistors coupled in series for creating a substantially binary output voltage based on the relative light intensities striking such phototransistors. A Schmitt-trigger circuit receives the binary output voltage and eliminates therefrom light-flicker components resulting from fluorescent lighting. Additional circuitry creates an enabling pulse at each transition of the Schmitt-trigger output signal, which enabling signal enables dual oscillator circuits. The dual oscillator output signals are gated together to drive a speaker for creating audible signals and to activate a light emitting diode. The electronic circuitry and speaker are housed in a baffle through which the phototransistors and light emitting diode protrude for communicating with a face portion of the toy.
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