Here is a 555 based solution. The 4017 counter creates a 20% duty cycle, reducing the size of C1 by 80% (very large caps do not work well in timers). An alternate configuration replaces Q1 with Q2 and Q3, eliminates D1, and reduces C1 to 47 uF. Power can be any 5 V or 12 V wall wart or USB charger.

Even at "only" 30 seconds I'm not wild about the long timer period. Last September I did a similar fan timer on another forum, based on the CD4060. I can modify and post it if interested.

ak
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First, I'd like to say thank you for all the time you put into this. It really means A LOT.

I have a Big Favor to ask of you. But I completely understand if don't have the time to elaborate any further.

Is there any way of making the diagram a little more User-Friendly for people who don't understand all of the symbols and layout?

I'd be interested in any other ways of making this work. The problem is that I am not very savvy in this field and I need help understanding it like I am in a 1st-Year High School Intro Course (which equals a lot more time explaining, and I understand everyone doesn't have the time to spell things out for people like me).

Thank you again.




Regards


Nicholas Shake

 

If my understanding of the datasheets is correct this is how things should interconnect :-

 

Binary counters count in - binary. That doesn't mean that they have to count in exact seconds, but it makes the math easier when they do. For example, 256 seconds for the off time is a nice round binary number, as is 64 seconds for the on time. Both of these can be decoded very simply from a watch crystal (32.768 kHz) and a 24-bit counter. Look into a CD4521 ic.

ak