Pro/Forums - View Single Post

TerraMex · 04-27-2003, 07:44 PM

Good schematic there.

>Although I would wire it up to alarm when the tank is down to ¼
>(just my opinion)

I think thats easy, just move the connection of the 2.2k resistor limiting the current on the transistors base to another point, so you can activate the buzzer in the level you want.

Btw, just a few questions :

The CD4066 is a quad analog switch, so how will it change the position connected with those copper/brass screws? Are you assuming that the submerged screws will conduct current through the water , and when the level drops it "cuts the power" to the screw?.

If so, then first, im not at ease of using an electrical circuit in water . Second, the conduction of electricity in water depends mainly on the impurities as far as i know. So using a very "clean" distilled water isnt going to invalidade the use of the circuit ?

04-27-2003, 07:44 PM	#8
TerraMex Cooling Savant Join Date: Nov 2002 Location: Portugal, Europe Posts: 870	Good schematic there. >Although I would wire it up to alarm when the tank is down to ¼ >(just my opinion) I think thats easy, just move the connection of the 2.2k resistor limiting the current on the transistors base to another point, so you can activate the buzzer in the level you want. Btw, just a few questions : The CD4066 is a quad analog switch, so how will it change the position connected with those copper/brass screws? Are you assuming that the submerged screws will conduct current through the water , and when the level drops it "cuts the power" to the screw?. If so, then first, im not at ease of using an electrical circuit in water . Second, the conduction of electricity in water depends mainly on the impurities as far as i know. So using a very "clean" distilled water isnt going to invalidade the use of the circuit ? __________________ "we need more cowbell."