OK, there's loads of information on the internet about LED throbbing circuits, none of which I could get to work, I tried RED and BLUE leds, but most of the throbbing circuits we're variations on the same 555 throbber. Now the only dimmer I could get to work is the one on the right, it's from a blog on this site: http://forum.allaboutcircuits.com/blog/leds-555s-pwm-flashers-and-light-chasers-index.378/ --------figure 5.2
now there's a curious effect, don't know if it is intended, D2 doesn't respond to the PWM signal (tried blue and red)
Now because PWM is the only way I could find that actually changes the brightness of a LED I'm thinking the circuit I require should be based on PWM, but I haven't learned enough (self study here) to build the circuit on my own...
Ultimately I need 2 out of phase variable speed throbbers (from 0 to bright) that connect's to a optocoupler's 2 infrared leds to replace the phototransistors of a photosensitive theremin, then ultimately build a fart piano, http://www.instructables.com/id/How-To-Build-An-Optical-Theremin/ In the video it shows how fading light onto the first phototransistor and then the second one produce a pretty real sounding fart sound!
Now any guidance will be appreciated, this is my long term project, but so far I've only been playing lego with other peoples circuits, I haven't done much designing myself. I kinda see you guys designing the circuits to be god-like!
PS. the only non infrared phototransistor I can get breaks the bank x4, dunno why they are so expensive in South Africa?
now there's a curious effect, don't know if it is intended, D2 doesn't respond to the PWM signal (tried blue and red)
Now because PWM is the only way I could find that actually changes the brightness of a LED I'm thinking the circuit I require should be based on PWM, but I haven't learned enough (self study here) to build the circuit on my own...
Ultimately I need 2 out of phase variable speed throbbers (from 0 to bright) that connect's to a optocoupler's 2 infrared leds to replace the phototransistors of a photosensitive theremin, then ultimately build a fart piano, http://www.instructables.com/id/How-To-Build-An-Optical-Theremin/ In the video it shows how fading light onto the first phototransistor and then the second one produce a pretty real sounding fart sound!
Now any guidance will be appreciated, this is my long term project, but so far I've only been playing lego with other peoples circuits, I haven't done much designing myself. I kinda see you guys designing the circuits to be god-like!
PS. the only non infrared phototransistor I can get breaks the bank x4, dunno why they are so expensive in South Africa?