I want to blink an led(0.75 seconds on and 0.75 seconds off) repeatedly. I was thinking of using an idea from a book called "But How Do It Know" by J. Clark Scott. A part of the book tries to explain how to make an oscillator to use in a computer(The book tries to teach the reader how to make a functioning computer)but doesn't really go into the details about how to change the frequency etc. A schematic to show a square wave generator is provided in the book. Here it is(Diagram 1):
The author says that the output will be too "fast" to be used for anything. He then says that to slow it down you have to lengthen the wire like so(Diagram 2):
This is obviously over simplified and impractical because you can't extend the wire for a long length without running out of space. How can you "slow down" the output of the circuit in Diagram 1 to produce a desired frequency(0.75 seconds HIGH and 0.75 seconds LOW). Here is a clock digram of what output I want(in hertz I think this would be 0.75 Hz, Correct me if I am wrong):
My question is: How do I slow down the output of the "not gate oscillator" (Diagram 1), to the desired output of(0.75 seconds "on" and 0.75 seconds "off") and is this frequency 0.75 Hz?