synthesizer problems

[[email protected]]

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.

 

[audioguru2]

You forgot to attach your schematic so we don't know how the 4066 is connected and is powered.

 

[[email protected]]

okay, sorry bout that. whats the best way to get schemmys onto something like this? draw it and scan it?

 

[MP1]

Topic moved. Posted in wrong forum.

Projects Q/A is reserved for discussion of projects in this site's project section.

MP

 

[quincy]

drawing it would be tedious, but a good way
if your more computery, you can do it in paint
either way, id like to see it, because ive been looking for a simple audio oscillator cicuit myself

 

[[email protected]]

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.