[sdiy] 555 VCO (was : <no subject>)

[Grant Richter]

> Personally, I would stay away from the 555 myself (sorry, I am a 555 bigot).
> Something like a good old fashsioned comparator, like the LM311 or LM319 (I
> prefer the 311, since there is only one of them in the package), work out much
> better in the long run.  If you build something like the ASM1 VCO, it is hard
> to
> get much simpler than that.  Basically, it consists of four opamps, a
> comparator,
> a fet, and a dual transistor.
> 
Even a TL074 is fast enough to be a comparator in that position. That is,
you don't absolutely need a LM311. It works better than a TL074 of course.