I'm looking to create a sound generator with only simple ICs and components. I believe the 555 timer IC is a good candidate to be at the core of it, but I cannot for the life of me find out how best to control frequency and PWM digitally, and without complex devices like digital potentiometers. I've tried working with different configurations of ladder networks, but nothing is giving me the results I need. Could someone more knowledgeable than me with 555 timers and simpler component networks (i'm far too used to my fancy digital stuff, ha) help me out on this one? I'd like to get a square wave frequency out with 10-90% variable duty cycle and frequency from around 50 to a few thousand hertz. Would appreciate any help from a veteran in this stuff to point me the right way. Thanks!
I think tryng to have an accurate digital control for a 555 oscillator output is much harder than forgetting the 555 and just using accurate digital control to generate the wanted waveform itself. A microcontroller would be a simple IC to do that, as they can have multiple PWM modules built-in.