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12 Channel LED Sequencer - based on4017 (added 4/02)
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12 Stage Neon Sequencer NE 2/NE 51 - This circuit is similar to
the LED clock using 12 neon indicator lamps instead of LEDs. It operates
from 2 high capacity ni-cad cells (2.5 volts) which keep it going for a
couple weeks. High voltage (70 volts) for the neon lamps is obtained from
a small switching power supply using a 74HC14 Schmitt trigger squarewave
oscillator, high voltage switching transistor..... [Bill Bowden's circuit] |
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12 to 100 LED Sequencer Using a Matrix - The circuit above
illustrates using a 10x10 matrix to sequence up to 100 LEDs with just
three ICs and 20 transistors. The two 4017 decade counters control the 10
rows and 10 columns so that one LED is selected depending on the output of
the decade counters. The LED circuit is drawn showing 25 LEDs and 10
transistors but can be expanded up to a 100 by using sucessive stages of
the 4017 counters. For example, to expand the circuit to 60 LEDs for
displaying minutes or seconds of a clock, the rows counter could be reset
from pin 12 (carry out) rather than pin 1 as shown, and the
columns..(electronic design added 6/07) |
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12
Volt Strobe Circuit - this circuit uses12V DC instead od mains AC.
This is very good idea if you don't want to mess with direct mains voltage connected
circuit or you want to run stroboscope from batteries. (added 4/02) |
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120 VAC Lamp Chaser using Solid State Relays - This circuit is basically the
same as the 10 channel LED sequencer with the addition of solid state relays to
control the AC lamps. The relay shown in the diagram is a Radio Shack 3 amp unit (part
no. 275-310) that requires 1.2 volts DC to activate. No current spec was given but I
assume it needs just a few.....(circuit / schematic design added 6/06) |
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120 Volt AC Lamp Chaser using Solid State Relays - This circuit is similar
to LED clock using12 neon indicator lamps instead of LEDs. It operates from2
high capacity ni-cad cells (2.5 volts) which keep it going for a couple weeks. High
voltage (70 volts) for neon lamps is obtained from a small.....(added 4/02)
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120VAC Lamp Chaser - Uses Solid State Relays (electronic circuit added 4/05)
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12v car lamp flasher - Schematic only, no circuit description |
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14
Volt Strobe Circuit - this circuit uses12V DC instead od mains AC.
This is very good idea if you don't want to mess with direct mains voltage connected
circuit or you want to run Strobe from batteries. (added 4/02) |
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16 Stage Bidirectional LED Sequencer - The bi-directional sequencer uses a 4
bit binary up/down counter (CD4516) and two "1 of 8 line decoders" (74HC138 or
74HCT138) to generate the popular "Night Rider" display. A Schmitt Trigger oscillator
provides the clock signal for the counter and the rate can be adjusted with the 500K
pot. Two additional Schmitt Trigger inverters are used as a SET/RESET latch to control
the counting direction (up or down). Be sure to use the 74HC14 and not the 74HCT14,
the 74HCT14 may not work due to the low TTL input trigger level. When the highest
count is reached (1111) the low output.... [Bill Bowden's website] |
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18 Stage LED Sequencer - The question sometimes comes up of how to cascade
4017 decade counters for more than 10 sequencial stages. The LED sequencer above shows
a possible solution using a few extra parts. When power is applied, the 15K resistor
and 10uF cap at pin 15 will reset the counters to the zero count where pin 3 is at +12
and all other outputs are at zero. The 2 diodes (1n914) and 15 resistor form a AND
gate so the clock pulse will be passed to the right side counter when the sequence
starts. When the right counter reaches the 10th count,.. [Bill Bowden's circuit] |
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