555 + transistor VCO

[R.D. Hess]

--- Paul Perry <pfperry at melbpc.org.au> wrote:
> I seem to remember a simple 555 sawtooth VCO using 
> a transistor as a constant current source to 
> straighten out the saw. Any pointers?

 Sounds like Tom G.'s vco555/VCO6.

 http://www.xavax.com/efm/pdf/vco555.pdf

 Or:

 http://www.xavax.com/efm/cbook/vco6.html

 Although I must confess I've not been able to get one
running even after two tries. Others have reported
success, so I'm sure it's my own incompetence to
blame.

 Richard Hess
 metamaticdiy at yahoo.com

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