Sequencer

This circuit sequence through a pattern of Christmas lights to turn on and off each string of lights, one at a time. After sequencing through all strings, the circuit turns the last string off, then turns all strings on, and then off, before repeating the pattern. Some simple wiring changes will let you set up other patterns. This circuit provides for five strings of lights, but you can increase or decrease the number, and adjust the timing...

Here is a simple circuit for sequentially flashing Christmas light strings or other similar low-power lamps. The socket symbols may be single bulbs or sockets for lamp strings. The load must be capable of operating from DC since the SCRs rectify the line voltage. The circuit may be extended by repeating the pattern with the last neon lamp connecting back to the first through a capacitor. Although a quick breadboard was tested, this circuit is "experimental" and may require some tweaking for best performance...

Last year I used FETs to switch the 12V inverter inputs to create those snazzy light creatures at Burning Man 98. This year well be upgrading to a smaller circuit that uses triacs to switch the high voltage output of the inverter. This file includes schematic, PCB layout, and a picture of a 5 circuit sequencer for EL wire. Its a simple circuit except for a few gotchas...

Very simple, versatile modular design. The purpose of this circuit was to create a ring in which LEDs or Lamps illuminate sequentially. Its main feature is a high versatility: you can build a loop containing any number of LEDs or Lamps, as each illuminating device has its own small circuit. The diagrams show three-stage circuits for simplicity: you can add an unlimited number of stages (shown in dashed boxes), provided the last stage output was returned to the first stage input, as shown. No limits to the number of modules used in the ring...

This deceptively simple sequencer actually pulse width modulates the LEDs as it fades from one LED to the next. Bulbs will last much longer when driven in this gentle manner. Add MOSFETs or transistors to the outputs if you wish to drive bulbs. You can reconfigure the three capacitors from a wye configuration to a delta configuration, or you can remove one of them entirely and the circuit will still function. Use high efficiency LEDs for best results. This circuit was inspired by the BEAM sequencer circuits on the web. I simply reversed the roles of the resistors-capacitors and `floated` the capacitors. If you remove the 1nF capacitor then the resulting monstrosity will chirp out RF interference as it hobbles along...

The happy-birthday singer is a two bit wide by n words deep programable sequencer with 4 commands: reset to start vector (00), decrease frequency (01),increase frequency (10), and pause (11). The device starts out with a 2 word vector jump at the start of memory which locates 16 positions in it`s memory. This jump vector is readdressed whenever a (11) command is found in the execution table. "Happy Birthday" is the first in this chain and is at default (00-00)...

The MAX125 and the MAX126 are complete 14-bit data-acquisition systems in which four of eight inputs are tracked and held simultaneously (Figure 1). An on-board sequencer allows the user to program which four (or fewer) channels are to be digitized. Throughput rates range from 250ksps for one channel to 76ksps for all four channels. The input ranges are ±5V (MAX125) and ±2.5V (MAX126)...