can you make my slow oscillator better? Schematic attached

Discussion in 'The Projects Forum' started by semegraph, Mar 31, 2010.

  1. semegraph

    Thread Starter Member

    Apr 7, 2007
    12
    0
    schematic.gif

    This circuit, as shown in schematic, seems to work pretty well, but I'm sure that there are lots of ways I could improve it's efficiency.

    I'd like to avoid ICs if I can, but if you can suggest better resistor values, etc I would be very grateful for the guidance. I have one typo in the schematic, the 100K resistor is actually more like 1000K.

    I have no idea what the 8Ω resistor does for it, but the circuit doesn't seem to work right without it. Any explanation for why this is would also be much appreciated.

    Please excuse my crude design, I don't have any formal training in electronic design.
     
    Last edited: Mar 31, 2010
  2. Bychon

    Member

    Mar 12, 2010
    469
    41
    I'm not really good at oscillators, but this looks like as few parts as you can use to make this work. What does, "more efficient" mean to you? One less part? Faster oscillation? Using less current? And, if it did get more efficient, what would it do better?
     
  3. bitrex

    Member

    Dec 13, 2009
    79
    4
    The design is what you might call...unconventional. ;) Partly because there does not appear to be any DC bias path to the transistor bases, and if I'm reading the schematic correctly the capacitors are connected with the wrong polarity :eek:. At what frequency does this circuit oscillate? Maybe there's some capacitor leakage current effect going on that is supplying the bases with current. Does the circuit stop oscillating if you remove a couple of those big capacitors?
     
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