velleman signal generator

Discussion in 'The Projects Forum' started by ninjaman, Mar 26, 2014.

  1. ninjaman

    Thread Starter Member

    May 18, 2013
    306
    1
    hello
    I have a velleman signal generator kit that I have put together and it works fine but only gives 100mv pk-pk.

    is there any way I could adjust it to give 1v pk -pk?

    im thinking its just changing a few resistors though my circuit analysis isn't very good and im not to sure what to change. its a basic 555 circuit that gives sine, saw, square and another(cant remember the name)

    I will try to attach a schematic I found on google

    any help or advice would be great

    thanks
    simon View attachment manual_mk105.pdf
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,432
    3,360
    Increasing the signal from 100mV to 1V requires an amplifier with a gain of 10.
    You cannot achieve this by simply changing resistors in the circuit.
     
  3. ninjaman

    Thread Starter Member

    May 18, 2013
    306
    1
    if I put an amplifier after it, that would increase it but would it do anything to the waveforms?
     
  4. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,977
    744
    use an op amp like this, the wave forms will only alter at the high kilohertz.
     
  5. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
    1,222
  6. GRNDPNDR

    Member

    Mar 1, 2012
    435
    7
    Won't this need a negative power supply for the op amp if he wants to maintain he signal properly?

    In which case he would need two batteries or a rail splitter circuit.
     
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