function generator / PWM

Discussion in 'The Projects Forum' started by samjesse, Apr 23, 2012.

  1. samjesse

    Thread Starter Active Member

    Sep 14, 2008

    I need a signal generator (tooth, square, sin) and be able to vary frequency from 1Hz to 1MHz for all 3 types with an option to rectify the signal so that only DC (>0v) is produced.
    For the square wave "at least", I need to be able to adjust the duty cycle and change the amplitude, n (1 to 1000) times a second. i.e. superimpose one duty cycle over another with amplitude control.
    The input will be 12v DC.

    My preemptively built square wave generator with 555 failed yesterday.
    I read lots of previous posts but could not find a match. Google/ebay did not help either.

    Many Thanks
  2. panic mode

    Senior Member

    Oct 10, 2011
  3. samjesse

    Thread Starter Active Member

    Sep 14, 2008
    The first paragraph before "Circuit Modification" says
    "Not shown in the circuit diagram is a 22n capacitor between the +5v supply rails of each individual IC."

    Does that mean I need to put a 22n capacitor where the numbers 16, 16 and 24 right above CD4046, CD4040 and D2732D chips?

    Can I get my square wave from pin 4 on the CD4046?

    What would be a user friendly EPROM programmer to get?

    Many Thanks
    Last edited: Apr 24, 2012
  4. cork_ie


    Oct 8, 2011