What is the # of this chip

[()blivion]

Just a reminder, If you use too large a electrolytic cap with too large a resistor in your timing section a 555 *CAN* malfunction due to leakage current.

 

[jpanhalt]

The out put of pin 3 of a 555 is high for a minimum of 50% of the time or more and in this set up it is high for around 81% of the time and the 2N2222 (actually a 2SD471) is used to invert that time
347 sec cycle time, 284 sec high time, 63 sec low time.

It might be easier to invert the output using a simple diode in the charge circuit as shown in the datasheet/application notes circulating for getting <50% duty cycle.

John

 

[kinarfi]

Final product, works the way I want it, just takes forever for it to start pumping when you turn it on because the 1000uf cap is starting at 0 v.
Sim says 7:53 (9:08 actual) to the first toggle, 63 s ( 1:41 actual) to the next, then 4:44 (7:22 actual), then 62 (1:46 actual), then 7:12 actual. Good enough for me, when i'm using it, I'm usually in my recliner for a hour or 3, so that just what I wanted.
Kinarfi