Ultra low frequency sawtooth oscillators

[Theo]

Doesn't sounds like frequentie nor wave form is very critical.
If you don't care about a minute more or less,
a humble 555 timer and bufer opamp might do.
For a better saw add a lin ramp.


Cheers Theo

PS. ik bel je rond 6 uur.


----- Original Message -----
From: Heiko van der Linden <h.j.vanderlinden at el.utwente.nl>
To: <synth-diy at node12b53.a2000.nl>
Sent: Thursday, April 20, 2000 9:28 AM
Subject: Ultra low frequency sawtooth oscillators


>
> Hi All,
>
> Does anyone know places where I can find schematics for ultra low
frequency
> saw tooth oscillators.
> I want to make such an oscillator for a sweep generator in a low frequency
> gain-frequency analyser.
> The sweep time should at least be able to be 10 minutes (1.66milliHz)
>
> Also which components should be carefully selected ? For instance if an
> opamp integrator is used
> the timing capacitor should be a low leakage type to avoid timing
> non-linearities.
>
> Bye,
> Heiko
>