Has anyone tried triggering the LED with a triangle wave yet? I'm about to try that, with the schem I got from play-hookey.com
i'll post how it comes out... (if it works)
actually...i cant get it working :(. All I get out of the op-amp is linear voltage....here's the link.
http://www.play-hookey.com/analog/triangle_waveform_generator.html
how can I mess that up?
I haven't really gotten anything with op-amps to work. I think my problem is providing them power. I've heard you need voltage halfing circuits or something... True? I've just been connecting Vcc to the + on the battery and V- to ground. I'm using a TL072.
Thanks.
Quote from: HalHas anyone tried triggering the LED with a triangle wave yet? I'm about to try that, with the schem I got from play-hookey.com
i'll post how it comes out... (if it works)
hmm i havent'. sorry, i just packaged up two of them and sold them
Quote from: Halactually...i cant get it working :(. All I get out of the op-amp is linear voltage....here's the link.
http://www.play-hookey.com/analog/triangle_waveform_generator.html
how can I mess that up?
I haven't really gotten anything with op-amps to work. I think my problem is providing them power. I've heard you need voltage halfing circuits or something... True? I've just been connecting Vcc to the + on the battery and V- to ground. I'm using a TL072.
Thanks.
If you're going to connect the V- from the op amp to ground, you're going to need a Vref in there at 4.5v. Try connecting a 10k resistor from ground, a 10k from your V+, and a 10uf cap from ground all to one point and you should get a near perfect half of your voltage. Now, that's what you use as ground in terms of the op amp.
Here's a schematic I did of a very similiar design:
(http://experimentalistsanonymous.com/images/tremolo/duallfo.gif)
That includes the vref schem. Hope that helps! :)
-Colin