function generator / PWM

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

  1. samjesse

    Thread Starter Active Member

    Sep 14, 2008
    202
    0
    Hello

    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
    1,321
    304
  3. samjesse

    Thread Starter Active Member

    Sep 14, 2008
    202
    0
    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

    Member

    Oct 8, 2011
    348
    58
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