Ultra low frequency sawtooth oscillators

[Heiko van der Linden]

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