Night Rider 16 Stage Bi-Directional LED Sequencer circuit


Posted on Feb 6, 2014

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 S


Night Rider 16 Stage Bi-Directional LED Sequencer circuit
Click here to download the full size of the above Circuit.

ET/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 at pin 7 sets the latch so that the UP/DOWN input to the counter goes low and causes the counter to begin decrementing. When the lowest count is reached (0000) the latch is reset (high) so that the counter will begin incrementing on the next rising clock edge. The three lowest counter bits (Q0, Q1, Q2) are connected to both decoders in parallel and the highest bit Q3 is used to select the appropriate decoder.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Sleep Mode Circuit Circuit
    Mixers and oscillators
    12V to 5V 3A DC converter step down Regulator
    Complete SS Laser Power Supply Schematics
    Wireless Headphone Transmitter Receiver Circuit
    Two-Wire Temperature Sensor
    Rectifier/filter circuit Semiconductors
    DIY Homemade Ignition Coil Driver
    MM36SB020 two-wire wiring diagram
    Transistor attenuation - feedback tone circuit



    Top