[sdiy] My first failure (4069 VCO)!

[Scott Gravenhorst]

Charles Brodeur <orange_juice_man_returns at yahoo.com> wrote:
>Hi all,
> Today I tired to build the 4069 based VCO, and it did not go well.
>After hours of soldering, I powered it up and got nothing on the
>outputs. I'm going to try to figure out what's wrong, but not today, I
>need a break. Could it be that the capaciters I used are electrolytic?
>I'll post pictures up at a later date, so say tuned. Thanks for
>reading!
>
>-Charles


If the timing cap (the one that is used in the integrator) is
electrolytic, then I can imagine that it's just too large.  You want
2.2 nano farads (2.2nF), not 2.2 micro farads (2.2uF) (1,000 times too
large).  If that's what you did, it may actually be working, but as a
VCLFO.


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