[email protected] Posted May 29, 2007 Report Share Posted May 29, 2007 hello everybody. so i am building a synth using a bunch of 555 astable circuits with an octave up feature that works like this: i use a cd4066 quad bilateral switch to connect a second timing resistor of the same value as the one in the astable circuit when the control pin is at logic 1. i tried te circuit without the timing resistor and it worked fine, but then i tried it with the 4066 and the second resistor, and for some reason, even when the second resistor isnt connected in parallel, it effects the astable circuit. i think there may be some leakage, or just something i dont know about the 4066, but i could really use some help. thanks, i appreciate it. Quote Link to comment Share on other sites More sharing options...
audioguru Posted May 29, 2007 Report Share Posted May 29, 2007 You forgot to attach your schematic so we don't know how the 4066 is connected and is powered. Quote Link to comment Share on other sites More sharing options...
[email protected] Posted May 30, 2007 Author Report Share Posted May 30, 2007 okay, sorry bout that. whats the best way to get schemmys onto something like this? draw it and scan it? Quote Link to comment Share on other sites More sharing options...
MP Posted May 30, 2007 Report Share Posted May 30, 2007 Topic moved. Posted in wrong forum.Projects Q/A is reserved for discussion of projects in this site's project section.MP Quote Link to comment Share on other sites More sharing options...
quincy Posted May 30, 2007 Report Share Posted May 30, 2007 drawing it would be tedious, but a good wayif your more computery, you can do it in painteither way, id like to see it, because ive been looking for a simple audio oscillator cicuit myself Quote Link to comment Share on other sites More sharing options...
[email protected] Posted May 30, 2007 Author Report Share Posted May 30, 2007 yeah, this i sreally simple if you dont have the whole octave-up thing goin on. its just abunch of 555 astables w/ their outputs connected via a diode to a 741 summing circuit, that also knocks off the harmonics. then just connect the 741's output to a 8 _()_ speaker decoupled with a 1 uF cap. Quote Link to comment Share on other sites More sharing options...
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