Pseudorandom Simulated Flicker Sequencer

Posted on Mar 9, 2013

The pseudorandom sequencer drives a solid-state relay. If you power a low-wattage lamp from the re

Pseudorandom Simulated Flicker Sequencer
Click here to download the full size of the above Circuit.

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.

Leave Comment

characters left:

New Circuits



Popular Circuits

Minimal metal detector
74C164 8 bit shift register work as a heart for car LED light sequencer
Triac Optimization Circuits Schematic Diagram
Mains Supply Failure Alarm
Frequency to voltage converter
multiplexed 7 segment
Microcontroller Voltmeter / Ammeter with LCD
Minimum Theremin Schematic
PWM Motor Control circuit
Basic Tilt Sensor Tutorial Circuit
10 Hz to 10 Khz Voltage Controlled Oscillator