DC-DC converter. How to make it oscillate?

Discussion in 'The Projects Forum' started by daviddeakin, Mar 22, 2010.

  1. daviddeakin

    Thread Starter Active Member

    Aug 6, 2009
    207
    27
    Hi,
    I am trying to design an ultra-simple DC-DC converter, and have developed the circuit below. By experimentation I have found that it works best when the transistor is driven with a 25kHz square wave, or 50kHz sine wave, at which point it will produce 30V @ 1mA, from a 1.5V battery.
    The question now is, can anyone see a way of making this circuit self oscillate so I don't need a separate oscillator circuit?
    (As usual, as soon as I actually want something to oscillate, it does its best to remain stable!)
     
  2. Ghar

    Active Member

    Mar 8, 2010
    655
    72
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
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