Looks great. Jules Verne would be proud.

Still working..!

 

His current version is at about 4 to 10 Hz so the cap on the 555 should be pretty small if a 100k to 220k resistor is used.

Hay MrSalts .. methinks this might have been an interesting option: https://www.ebay.com/itm/333761319731?var=542840024031



It's about 1/5th the volume of the blob I created from parts... Still working fine, by the way.. thanks again.

 

Use the @MrSalts tag to get peoples attention.

 

Use the @MrSalts tag to get peoples attention.

I see... thanks... click on logo, and "start a conversation" ..

 

Yes, it sure would have made it easier and smaller. But your first attempt was a good way to shake the cobwebs out of your rafters and get you back into electronics design. My doc told me that an active brain keeps the Alzheimer's away.
I love the look of your tank.

 

Thanks much for the appreciation.. check out https://www.MicroOceans.com .. I built all that stuff over the last 8 years with much help from many forums and people like you .... https://www.microoceans.com/control-systems ... but... methinks the Alzheimer's is slowly creeping in... sigh!