This is a continuation of a thread I started last year. But it's a little more focused so I think it's better to start a new thread.
I need a triangle wave with a cycle time of ~30 seconds. I've developed a simulation of a standard op-amp circuit that does a nice job. But it requires a 68µF capacitor for the integrator and I don't think I can use a polarized capacitor for that. Sticking to non-polarized capacitors – usually 1µF or below – I can't get anywhere near 30 seconds.
Is there some other way to do this? Could I use the 2nd op-amp on the dual IC to help somehow? If it matters, a little bit of clipping to make a trapezoid would be fine but it needs to be nearly a triangle.
I have a 555 as the input to this. If using the timing cap voltage on the 555 would help, that's an option
I need a triangle wave with a cycle time of ~30 seconds. I've developed a simulation of a standard op-amp circuit that does a nice job. But it requires a 68µF capacitor for the integrator and I don't think I can use a polarized capacitor for that. Sticking to non-polarized capacitors – usually 1µF or below – I can't get anywhere near 30 seconds.
Is there some other way to do this? Could I use the 2nd op-amp on the dual IC to help somehow? If it matters, a little bit of clipping to make a trapezoid would be fine but it needs to be nearly a triangle.
I have a 555 as the input to this. If using the timing cap voltage on the 555 would help, that's an option