ok friends i need help whith building a square wave presicion oscillator,brainwaves,theta 3.5hz,6.3hz,alpha 7.83hz,7.0hz 10.0hz,betha 14.1hz,dave jhonnson sugest to use a LTC1799 IC and then a divider CD4020 I WANT TO USE A 6 position sw to switch from frecuencies,any good help it is 4 my new chi generator thanks to all have a great one