Strange LED sequencer

Posted on Nov 10, 2012

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.

Strange LED sequencer
Click here to download the full size of the above Circuit.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Active SubWoofer
    Two-tones Siren with IC 4093
    Stand-by Battery Charger
    Mini Oscilloscope schematic
    Speech activity detector for telephone lines
    Battery charging regulator
    Schematics Serial Temperature Sensor Data Logger
    Schematics Stereo Parabolic Microphone
    Alarm Digital Clock-DS1307
    Telephone transmitter
    3 Band Audio Equalizer Circuit
    AMP-04 0 F 400 temperature measurement circuit