I've got loads of those little toy circuit boards with samples triggered by pulsed Dc and I've figured out I caan use 4066's controlled by 4017's controlled by 555's but what I need now is something to control, well not control so much as switch, the 555's.
I've found thishttp://www.super-freq.com/wp-content/up ... f_hold.jpg
Which has white noise injected into it and will give me a random voltage so I think I'm halfway there. Now all I need is some way of using random voltages to switch different 555's on and off.
But really I should explain what I actually want to do. Each 4066 has 4 switches so I'll have two 4066's switched by 1 4017 running and 1-8 count controlled by a 555. Each of these will be a block and I'll have about 5 or 6 blocks. So lets say I have 6 x 8 = 48 samples. So what I what is a randomised switching setup that controls this lot of six that isn't a fixed speed but starts off slow and gets faster then slows down again.
So if each sample is say an average of 2 secs long I want a timing circuit that switches randomly every three seconds at the start and then builds up to .5 seconds after about a minute and then goes back to about every 3 secs after another minute and so it goes on.
Actually the randomness isn't so Important as the blocks can be controlled by a mother 555 and 4017 but the cresendo and descent or a logarithmic timer, as it were, thats what I want.