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Pseudorandom Simulated Flicker Sequencer

2017-09-01 01:07  
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The pseudorandom sequencer drives a solid-state relay. If you power a low-wattage lamp from the re
Pseudorandom Simulated Flicker Sequencer

lay, the lamp will appear to flicker like a candle`s flame in the wind; using higher-wattage lamps allows you to simulate the blaze of a fireplace or campfire. You can enhance the effect by using three or more such circuits to power an array of lamps. The circuit comprises an oscillator, IC1, and a 15-stage, pseudorandom sequencer, IC2-4. The sequencer produces a serial bit stream that repeats only every 32 767 bits. Feedback from the sequencer`s stages 14 and 15 go through IC4D and back to the serial input of IC2. Notice the RC network that feeds IC4C; the network feeds a positive pulse into the sequencer to ensure that it won`t get stuck with all zeros at power-up. The leftover XOR gates IC4A and IC4B further scramble the pattern. The serial stream from IC4B drives a solid-state relay that features zero-voltage switching and can handle loads as high as 1 A at 12 to 280 Vac.



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