Thank you That circuit looks much more complicated, but I'm always up for a challenge.
Look at it as blocks, then it get's much easier
Could you just briefly explain what's happening with the timer, in terms of input, trigger, output?
You didn't see the description in the schematic?
OK, I see what a trimmer is now. For my purposes I'd rather use a potentiometer just so I'm able to have control over how much water gets dumped on me
You do have control with a trimmer as well just not as readily.
So, if I use #2, then I won't need to install an additional switch for the entire circuit?
You don't need to install a swith at all, when the alarm is off, there's no drain.
On the schematic you've said "20s - 72s". If I want this range to be slightly lower (maybe from 10s - 60s) what value potentiometer should I use?
Still 1MOhm. It's that value that gives the ~50s variance. Change R6 to 180k to get get around 9s as the lower limit.
I know the equation is there, but I'm having a little trouble converting with all the zeroes
Zeroes are easy to convert, but pay attention to what side of the decimal point they're at
If you have a math calculator, you can enter a number like 47µ as 47E-6 and 1MOhm as 1E6.
I'll have to do some more reading into how it picks up noise - it's similar to how you told me I couldn't leave the base of Q2 'floating' earlier. It seems interesting, but I'm not able to completely understand the occurrence.
And just to clarify, what is "pF" in terms of F? Like "uF" is micro-Farads..
The noise shouldn't be a problem as long as impedances (resistances) are kept reasonably low, so don't worry too much about it for now. The function, if the impedance is high, is comparable to a radio antenna.
1,000 pF (pico-Farad) equals 1nF
1,000 nF (nano-Farad) equals 1µF
Thank you so much once again I can honestly say that you're my role model - I want to be as knowledgeable as you are in this field. What is your profession anyway?
Thanks for the kind word, but be careful what you wish for
It probably doesn't come as a huge surprise that I'm an electronics engineer.
You're on the right track... Curiosity is probably the single most important trait to get you going in any technical discipline!
Please read what I wrote on the schematic and then tell me if you need any clarification