Re: My NE-2 Relaxation Oscillator is Too Relaxed ???

<jalbers@[EMAIL PROTECTED]
> wrote in message 
news:2f8acf53-1cda-424c-9073-6706a1eb55ac@[EMAIL PROTECTED]
>I am experimenting with a relaxation oscillator circuit consisting of
> a NE-2 bulb wired parallel to a capacitor and this pair is wired in
> series with a resistor and connected across a 150 V DC power source (a
> bunch of DC wallwarts connected in series).  The resistor is variable
> 0-1 Meg Ohm, the capacitor is a 1uF electrolytic rated at 160V.  I
> don't have any capacitors on hand with a higher working voltage.
>
> The circuit seems to work.  I can get the bulb to blink around 3 times
> a second but I am wanting a higher flash rate and I am not getting
> it.  Lowering the resistance makes the bulb turn on continuously.  I
> don't think that the bulb is fla****ng faster than the eye can
> distinguish.  I conneded the circuit to an oscilliscope and when the
> bulfb is visually fla****ng I see the RC discharge curve but lowering R
> until the bulf truns on continuously pretty much produces a flat line
> on the scope.
>
> I was expecting to maybe be able to get around 2-100 hz with a NE-2
> relaxation oscillator.  Is this possible or am I expecting too much
> from this type of circuit?  And if so, why?
>
> Any help would be greatly appreciated.  Thanks
>

Try a smaller capacitor e.g. 0.47uF