Single Pulse Generator

Discussion in 'General Electronics Chat' started by Engr, Apr 23, 2010.

  1. Engr

    Thread Starter Member

    Mar 17, 2010
    Hi Guys,

    I need help designing a 3 single pulse generator. Each single pulse generator is connected to the gate of a mosfet. These pulse generator will turn on 2 mosfets together then turn on the 3rd mosfet when the 2nd mosfet turns off. the 2nd mosfet has a longer turn on time. See attached file for a detailed explanation
  2. rjenkins

    AAC Fanatic!

    Nov 6, 2005
    How about a 4017 counter IC with a clock oscillator.

    Use one of the higher outputs to disable or gate off the clock input.

    Outputs 2, 3 & 4 would be the outputs, using outputs 2 & 3 through diodes to give the longer pulse.

    Activating and releasing the Reset pin would allow it to sequence through the outputs.

    If you need different time combinations, you can use outputs in twos, threes or mixes (combined with diodes) to get the appropriate times.
  3. kingdano

    Senior Member

    Apr 14, 2010
  4. SgtWookie


    Jul 17, 2007
    If you want to control the times with a reasonable amount of precision, using a uC would be a good bet. Have the uC control MOSFET gate drivers to minimize your turn on/turn off times.
  5. Engr

    Thread Starter Member

    Mar 17, 2010
    May I ask what is a uC?
  6. retched

    AAC Fanatic!

    Dec 5, 2009
    u is for MICRO
    C is for Controller.

    uS microSecond
    uF microFarad
    uC microController

    Popular uCs for hobbyists are PICMicro from Microchip and AVR from AMTEL.

    They both can be programmed with C, or Assembler. They also have compilers that allow you to code the chips in BASIC.