I posted here several days ago asking how I could get a triangle wave out of a 555 timer. I am trying to build an LFO for a simple guitar phaser and I need a triangle wave. I decided to try and feed the square wave output from the 555 to an inverting integrator op amp. I have a 100k pot that i am using to control the frequency of the 555's output pulse. I have leds hooked up to the output of both the 555 and the integrator to monitor the outputs.
The output of the 555 works as expected. It flashes on and completely off with frequency controlled by the pot. The integrator however, will brighten, but then never go completely off. It brightens and then returns to a dim state rather than turning completely off. What could be causing this?
Another question I have is, how can I calculate what the integrators component values should be? Right now, I have a one microfarad capacitor and two 1 mega ohm resistors(in series). This has caused the output at the integrator to pulse and not blink like the 555. However, the output of the integrator still never completely turns off.
Thanks
The output of the 555 works as expected. It flashes on and completely off with frequency controlled by the pot. The integrator however, will brighten, but then never go completely off. It brightens and then returns to a dim state rather than turning completely off. What could be causing this?
Another question I have is, how can I calculate what the integrators component values should be? Right now, I have a one microfarad capacitor and two 1 mega ohm resistors(in series). This has caused the output at the integrator to pulse and not blink like the 555. However, the output of the integrator still never completely turns off.
Thanks